Schneider Electric 762CNA SINGLE STATION MICRO® Controller Master Instruction Sheet

Instruction
MI 018-885
August 2018
762CNA
SINGLE STATION MICRO®
Controller
MI 018-885 – August 2018
2
Contents
Figures ........................................................................................................................................... 9
Tables .......................................................................................................................................... 13
Important Information ................................................................................................................ 15
Please Note ...............................................................................................................................15
Preface ......................................................................................................................................... 17
Safety Considerations ................................................................................................................17
Organization .............................................................................................................................17
Intended Audience ....................................................................................................................17
How to Use This Manual ..........................................................................................................17
1. Quick Check............................................................................................................................ 19
Seating the NOVRAM..............................................................................................................20
Connecting to Power Source .....................................................................................................21
Controller Display.....................................................................................................................22
Changing the Display................................................................................................................23
Reading Additional Information ...............................................................................................24
Looking for More Information?.................................................................................................25
2. Product Overview.................................................................................................................... 27
Description ...............................................................................................................................27
Functional Block Diagram ........................................................................................................28
Front Panel................................................................................................................................32
Display Functions.................................................................................................................33
Keypad Functions.................................................................................................................34
3. Installation .............................................................................................................................. 35
Important Precautions...............................................................................................................35
Shock Hazards......................................................................................................................35
Explosion Hazards................................................................................................................36
Unpacking ................................................................................................................................36
Controller Identification ...........................................................................................................36
Positioning Links ......................................................................................................................37
Installation Procedure................................................................................................................38
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MI 018-885 – August 2018
Contents
Removing Input Range Resistors ..........................................................................................40
Signal Wiring Guidelines ..........................................................................................................41
Connecting Wires to Terminals ............................................................................................41
Wiring to Controller ............................................................................................................42
Input Signal Wiring ..................................................................................................................42
Input Signal Terminal/Wire Designations.............................................................................42
Analog Input Signal Wiring..................................................................................................44
Frequency Input Signal Wiring.............................................................................................45
Pulse Input Wiring ...............................................................................................................47
RTD and Contact Input Wiring...........................................................................................48
Output Signal Wiring ...............................................................................................................49
Output Signal Terminal/Wire Designations..........................................................................49
Output Signal Wiring Examples...........................................................................................49
Serial Communication Wiring ..................................................................................................50
Terminal/Wire Designations.................................................................................................50
Wiring to an RS-485 Interface .............................................................................................50
Power Wiring ............................................................................................................................51
Accessory Equipment ................................................................................................................51
Optional Surge Suppressor ...................................................................................................52
RS-232/RS-485 Converter ...................................................................................................53
Wiring..................................................................................................................................53
OPTO-22 Board Model AC24 Converter Card ...................................................................55
4. Configuration.......................................................................................................................... 57
Introduction..............................................................................................................................57
Planning Your Configuration................................................................................................57
Implementing Your Configuration .......................................................................................61
Common Configuration Functions ...........................................................................................64
Security ................................................................................................................................64
Control Type and Tuning .....................................................................................................65
Input Signals ........................................................................................................................65
Input Signal Conditioning and Scaling.................................................................................66
Output Signals .....................................................................................................................68
Display Features ...................................................................................................................68
Auto/Manual Control (A/M) ...............................................................................................68
Alarms.......................................................................................................................................69
General Information.............................................................................................................69
Forms of Alarms ...................................................................................................................70
Types of Alarms....................................................................................................................70
Alarm Action........................................................................................................................74
Configuring, Tuning, and Displaying Alarms .......................................................................74
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Contents
MI 018-885 – August 2018
Alarm Configuration Examples ............................................................................................75
Alternate Station Configurations ...............................................................................................79
Dual Controller....................................................................................................................79
Cascade Controller ...............................................................................................................79
Auto Selector Controller.......................................................................................................80
Auto/Manual Station............................................................................................................81
Indicator Station ..................................................................................................................82
Additional Configuration Functions..........................................................................................82
Logic Gates ..........................................................................................................................82
Calculations .........................................................................................................................83
Dynamic Compensation.......................................................................................................87
Totalizers ..............................................................................................................................90
Set Point...............................................................................................................................92
Set Point Limits....................................................................................................................93
Ratio Control .......................................................................................................................94
Output Summing and Multiplying.......................................................................................94
Output Tracking...................................................................................................................95
Split Range Output ..............................................................................................................95
Output Limits ......................................................................................................................99
Output Action....................................................................................................................100
Output Upon Restart (STARTUP).....................................................................................100
Output Reverse ..................................................................................................................100
Output Bargraph................................................................................................................100
Characterizers.....................................................................................................................100
Nonlinear Control..............................................................................................................101
pH Display.........................................................................................................................101
Serial Communications ......................................................................................................101
Toggle ................................................................................................................................102
Batch Control.....................................................................................................................103
Integral Feedback ...............................................................................................................103
Rate of Change Alarms.......................................................................................................104
Configuration Copy Accessory ................................................................................................104
5. Operation .............................................................................................................................. 107
Functions ................................................................................................................................107
Block Diagram ...................................................................................................................107
Controls and Indicators...........................................................................................................110
Keypad ...............................................................................................................................112
Structure Diagrams .................................................................................................................112
Modes of Operation ................................................................................................................113
SET OPTUNE .......................................................................................................................113
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MI 018-885 – August 2018
Contents
NORMAL Mode Operation ...................................................................................................113
Entering a Passcode ............................................................................................................114
Reading Values of Variables ................................................................................................114
Changing the Control Status ..............................................................................................118
Changing Set Point, Output, and Variables ........................................................................118
Displaying/Acknowledging Alarms .....................................................................................120
Changing Alarm Settings....................................................................................................123
Enabling/Disabling EXACT Tuning...................................................................................123
Switching Faceplate Displays ..............................................................................................124
Switching Modes ................................................................................................................124
Operation as an Auto/Manual Station .....................................................................................124
Operation as a 3-Variable Indicator Station .............................................................................125
Operation as an Auto-Selector Station.....................................................................................126
Operation as a Cascade Control Station ..................................................................................126
Totalizer Operation .................................................................................................................126
READ Mode Operation..........................................................................................................127
6. EXACT Tuning..................................................................................................................... 129
Technical Description .............................................................................................................129
Benefits of EXACT Tuning ................................................................................................129
EXACT Steps .....................................................................................................................130
Determining Process Response (Pattern Recognition).........................................................130
Calculating PID Values (STUN Algorithm) .......................................................................131
Calculating Initial Parameters (PTUN Algorithm) .............................................................133
User-adjustable Parameters .................................................................................................135
Using EXACT Tuning with 762C Controllers ........................................................................137
Use of Structure Diagrams..................................................................................................137
Keys Used with EXACT.....................................................................................................138
Responding to a ? Prompt ..................................................................................................138
Configuring EXACT..........................................................................................................139
Status Messages ..................................................................................................................140
Messages — Read EXACT Pretune ...................................................................................141
Messages — Read EXACT Self-tune .................................................................................141
Messages — Read EXACT Entries ....................................................................................141
Tutorial Example.....................................................................................................................142
EXACT Parameter Tables........................................................................................................145
Parameter Limits and Values...............................................................................................146
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Contents
MI 018-885 – August 2018
7. Calibration, Troubleshooting, Maintenance .......................................................................... 149
Calibration..............................................................................................................................149
Frequency of Calibration ....................................................................................................149
Calibration Equipment Accuracy........................................................................................149
Calibration Connections ....................................................................................................149
Calibration Procedures .......................................................................................................150
Controller Range Conversion .............................................................................................155
Output 2 Selection .............................................................................................................160
Troubleshooting ......................................................................................................................162
Maintenance ...........................................................................................................................165
General Information...........................................................................................................165
Removal and Replacement of Parts.....................................................................................166
Appendix A. Specifications ........................................................................................................ 169
Functional Specifications.........................................................................................................169
Physical Specifications.............................................................................................................171
Operating and Storage Conditions ..........................................................................................172
Electrical Specifications ..........................................................................................................172
Performance Specifications ......................................................................................................173
Optional Features and Accessories ...........................................................................................174
Appendix B. Configuration Worksheets..................................................................................... 175
Factory Preconfiguration Diagrams .........................................................................................194
Appendix C. Structure Diagrams ............................................................................................... 217
Appendix D. Parts List .............................................................................................................. 223
762CNA SINGLE STATION MICRO Controller with Integral Power Supply
Style AA*, DIN Panel Mounted ..............................................................................................223
Model Code .......................................................................................................................224
Appendix E. Dimensional Print ................................................................................................. 235
Appendix F. Functional Diagram ............................................................................................... 237
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MI 018-885 – August 2018
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Contents
Figures
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Rear Support for Controller ................................................................................................19
Seating the NOVRAM ......................................................................................................20
Connecting to Power Source ...............................................................................................21
Controller Display...............................................................................................................22
Operator Keypad.................................................................................................................23
Model 762CNA Controller. ................................................................................................28
Block Diagram of a 762CNA Control Station....................................................................28
Panel Display (Faceplate 1 or 2) ..........................................................................................33
Keypad................................................................................................................................34
Typical Data Plate ...............................................................................................................36
Link Locations ....................................................................................................................37
Removing Controller from Housing....................................................................................38
Mounting of Controller ......................................................................................................39
Rear Support for Controller ................................................................................................39
Removing Input Range Resistors.........................................................................................40
Connecting Wires to Terminals ...........................................................................................41
Terminal Identification........................................................................................................42
Examples of Analog Input Signal Wiring.............................................................................44
Examples of Frequency Input Signal Wiring for E83 Vortex Flowmeter ..............................45
Examples of Frequency Input Signals from 81 or 82 Turbine Flowmeter with
PA108, PA109, or A2020LA Preamplifier ...........................................................................46
Examples of Frequency Input Signals from 81 or 82 Turbine Flowmeter with
PA-106A Preamplifier .........................................................................................................46
Examples of Frequency Input Signals from
Self-Powered Flow Transmitter and Positive Displacement Meters.................................47
Examples of Pulse Input Wiring for Remote Set Points .......................................................47
Examples of RTD and Contact Input Signal Wiring ...........................................................48
Examples of Output Signal Wiring of Controller ...............................................................49
Serial Communications Wiring of Controller .....................................................................50
Power Wiring to Controller.................................................................................................51
Installation of Optional Surge Suppressor ...........................................................................52
RS-232 to RS-485 Converter Signal Wiring........................................................................54
Cable Connections to 9-Pin Male RS-485 Connector ........................................................55
Keypad ...............................................................................................................................61
Example Showing Use of Configuration Keys ....................................................................63
Input Signal Conditioning and Scaling ...............................................................................67
High/Low Absolute Alarm ..................................................................................................71
High/Low Deviation Alarm ................................................................................................71
High/High Absolute Alarm .................................................................................................72
High/High Deviation Alarm ...............................................................................................72
Low/Low Absolute Alarm...................................................................................................73
Low/Low Deviation Alarm..................................................................................................73
Alarm Configuration - Example 1 .......................................................................................76
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MI 018-885 – August 2018
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Figures
Alarm Configuration - Example 2 .......................................................................................76
Alarm Configuration - Example 4 .......................................................................................77
Alarm Configuration - Example 5 .......................................................................................78
Single Cascade Controller Example .....................................................................................79
Typical Auto Selector Control Application ..........................................................................81
Signal Selecting ...................................................................................................................85
Signal Switching..................................................................................................................86
Using Gates Together ..........................................................................................................86
Ramping Set Point ..............................................................................................................87
Dynamic Compensation .....................................................................................................88
Nonimpulse Mode ..............................................................................................................88
Impulse Mode .....................................................................................................................89
Follow Switches...................................................................................................................89
Totalizer ..............................................................................................................................90
Inventory Control ..............................................................................................................91
Batching..............................................................................................................................92
Ratio ...................................................................................................................................94
Output Modification and Tracking .....................................................................................95
Split Range Application .....................................................................................................96
Split Range Diagrams..........................................................................................................97
Effect of Shifting Split Point................................................................................................98
Effect of Deadband .............................................................................................................99
TOGGLE Feature.............................................................................................................103
Configuration Copy Accessory ..........................................................................................105
Block Diagram of a 762CNA Control Station...................................................................108
Panel Display (Faceplate 1 or 2) ........................................................................................110
Keypad..............................................................................................................................112
Faceplate Displays When Configured for Local Set Point and Totalizer .............................116
Faceplate Displays When Configured for Workstation/Panel and Local/Remote
Set Point and Totalizer.......................................................................................................117
Alarm Displays, High Alarm on Absolute Measurement (Level 1, Latched).......................122
Flow Diagram for Enabling/Disabling EXACT Tuning .....................................................124
3-Variable Indicator Station (Faceplate 1 or 2) ..................................................................125
Reading the Value of Totalizer Preset .................................................................................126
Structure Diagram for READ Mode Functions .................................................................127
Pattern Recognition Characteristics...................................................................................130
STUN Algorithm State Diagram.......................................................................................132
Typical Process Response to Step Change in Controller Output ......................................134
Pretune States...................................................................................................................135
Maximum Wait Time (WMAX)........................................................................................136
Period of Oscillation (T) ...................................................................................................136
Damping and Overshoot...................................................................................................137
Structure Diagram for EXACT .........................................................................................139
General Flow Diagram for Configuring EXACT...............................................................143
Structure Diagram 1..........................................................................................................150
Structure Diagram 2..........................................................................................................151
Terminal Connections for External Current or Voltage Inputs ..........................................152
Terminal Connections for RTD Input Calibration............................................................153
Figures
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MI 018-885 – August 2018
Terminal Connections for Output Calibration ..................................................................154
Location of Input Range Resistors.....................................................................................155
Addition of Input Range Resistors.....................................................................................156
RTD Printed Wiring Assembly .........................................................................................157
Output 2 Jumper Location................................................................................................161
Location of Diagnostic Jumper..........................................................................................163
Controller Assembly Diagram ...........................................................................................166
Definition of Worksheet Contents ....................................................................................176
Structure Diagram 1 – READ ...........................................................................................219
Structure Diagrams 2 and 3...............................................................................................220
Structure Diagrams 4 – ALLTUNE (OPTUNE), 5 – Configuration,
6 – Signal Distribution List, and 7 – Gate Input List ........................................................221
Structure Diagram 8..........................................................................................................222
DIN Panel-Mounted Controller Assembly ........................................................................225
743CB FIELD STATION MICRO Controller - Exploded View......................................226
Base Assembly ...................................................................................................................229
Controller Housing Showing Earth (Ground) Wiring .......................................................230
Electronics Module Assembly - Digital PWA ....................................................................231
Power Supply Connections................................................................................................232
Electronics Module Assembly - Digital PWA.....................................................................233
762CNA SINGLE STATION MICRO Controller...........................................................235
Panel Cutout Dimensions .................................................................................................236
Functional Diagram ..........................................................................................................237
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MI 018-885 – August 2018
12
Figures
Tables
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42
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Keypad Functions ...............................................................................................................24
Link Locations ....................................................................................................................37
Terminal and Wire designations for Input signal Wiring .....................................................42
Output Signal Terminal and Wire Designations ..................................................................49
Serial Communications Terminal/Wire Designations ..........................................................50
RS-232/RS-485 Converter Specifications............................................................................53
RS-485 Terminal Connections on RS-232/485 Converter ..................................................53
Content of Configuration Worksheet ..................................................................................58
Signal Distribution List .......................................................................................................59
Gate Input List....................................................................................................................60
Keypad................................................................................................................................61
List of Characters ................................................................................................................63
Control Parameter Limits....................................................................................................65
Alarm Configurations..........................................................................................................69
High/Low alarms ................................................................................................................71
High/High Alarms ..............................................................................................................72
Low/Low Alarms.................................................................................................................73
Alarm Actions .....................................................................................................................74
Configuring Logic Gates .....................................................................................................82
Characters for Use in Calculations.......................................................................................83
Configuration of Serial Communication Parameters .........................................................101
Effect of / Keys with R/L Not Configured ...................................................................118
Operation of Remote/Local Controller with Totalizer .......................................................119
Operation of Ratio Controller with Totalizer.....................................................................120
Keys Used with EXACT....................................................................................................138
RD EXACT PTUNE........................................................................................................141
RD EXACT STUN ..........................................................................................................141
Messages – RD EXACT ENT...........................................................................................141
EXACT Parameters ...........................................................................................................145
EXACT Parameter Limits and Values................................................................................146
RTD Span Jumper Positions..............................................................................................157
RTD Zero Elevation Jumper Positions ..............................................................................157
RTD Temperature Difference Jumper Positions.................................................................158
Output 2 Jumper Positions................................................................................................160
Diagnostics .......................................................................................................................164
Contact Input and Output Terminals................................................................................164
Fuses .................................................................................................................................167
Functional Specifications — Standard Product..................................................................169
Physical Specifications – Standard Product........................................................................171
Operating and Storage Conditions ....................................................................................172
Electrical Classification......................................................................................................172
Optional Features and Accessories .....................................................................................174
Signal Distribution List .....................................................................................................177
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Tables
Gate Input List..................................................................................................................177
List of Characters ..............................................................................................................178
Characterization Curve Planning Table .............................................................................178
Configuration Worksheets.................................................................................................179
DIN Panel Mounted Controller Assembly ........................................................................227
.........................................................................................................................................227
Base Assembly ...................................................................................................................229
Digital PWA Portion of Electronics Module Assembly ......................................................231
Recommended Spare Parts Summary ................................................................................232
Important Information
Read these instructions carefully and look at the equipment to become familiar with the device
before trying to install, operate, service, or maintain it. The following special messages may
appear throughout this manual or on the equipment to warn of potential hazards or to call
attention to information that clarifies or simplifies a procedure.
The addition of either symbol to a “Danger” or “Warning” safety label
indicates that an electrical hazard exists which will result in personal injury
if the instructions are not followed.
This is the safety alert symbol. It is used to alert you to potential personal injury
hazards. Obey all safety messages that follow this symbol to avoid possible injury or
death.
DANGER
DANGER indicates a hazardous situation which, if not avoided, will result in death or serious
injury.
!
WARNING
WARNING indicates a hazardous situation which, if not avoided, could result in death or
serious injury.
!
CAUTION
CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
!
NOTICE
NOTICE is used to address practices not related to physical injury.
Please Note
Electrical equipment should be installed, operated, and maintained only by qualified personnel.
No responsibility is assumed by Schneider Electric for any consequences arising out of the use of
this material.
A qualified person is one who has skills and knowledge related to the construction, installation,
and operation of electrical equipment and has received safety training to recognize and avoid the
hazards involved.
15
MI 018-885 – August 2018
16
Important Information
Preface
Safety Considerations
All products are designed and manufactured to minimize the risk of damage and injury to
property and personnel. They meet or exceed applicable governmental and industry safety design
standards. However, their safe use depends on proper installation, operation, and maintenance by
you, the user. This manual provides you with the information needed for this. Please pay close
attention to the portions of this manual that relate to safety.
Organization
This manual is designed to present all information about the 762C Controller needed by
installers, process engineers, operators, and maintenance personnel. A parts list is included in
Appendix D and a dimensional print is included in Appendix E. The only additional document
that may be needed for some installations is MI 018-888, Serial Communications Guide for 762C
and 743CB Controllers, a reference intended primarily for programmers and software engineers.
Intended Audience
This manual is intended for the following types of readers:
 Process Operators
 Process Engineers
 Process Supervisors
 Maintenance Personnel
 Equipment Installers
 Programmers/Software Engineers
How to Use This Manual
Process Operators
If you are interested in operating information, first read Chapter 2, “Product Overview”and then
read Chapter 5, “Operation”. If you need more information, read the Appendix references given
in Chapter 5.
Process Engineers
If you are interested in configuration details, first read Chapter 2, “Product Overview” for general
information about the product. You may also want to look at Appendix A, “Specifications” for
detailed specification and agency certification data.
17
MI 018-885 – August 2018
Preface
To learn how to configure the unit, read Chapter 4, “Configuration”. To make use of the
information in Chapter 4, you should also become familiar with the configuration worksheets in
Appendix B, “Configuration Worksheets”and the structure diagrams in Appendix C, “Structure
Diagrams”. You will find the structure diagrams to be the most important tool in configuring
your controller.
For detailed information on the EXACT control feature, read Chapter 6, “EXACT Tuning”.
For operating information, read Chapter 5, “Operation”.
For detailed instructions on programming serial communication functions in a host, refer to
MI 018-888, Serial Communications Guide for 762C and 743CB Controllers.
Process Supervisors
Use the same guidelines as those given for process engineers.
Maintenance Personnel
For calibration, troubleshooting, and maintenance information, read Chapter 7, “Calibration,
Troubleshooting, Maintenance”. For background purposes, it may also be advisable to read
Chapter 2, “Product Overview” and Appendix A, “Specifications”.
Equipment Installers
For quick check information, read Chapter 1, “Quick Check”.
For more detailed installation instructions, first read Chapter 2, “Product Overview”, and then
read Chapter 3, “Installation”. You may also need to refer to the dimensional print in Appendix E,
“Dimensional Print”and the parts list in Appendix D, “Parts List”.
For information on Electrical Classification, Agency Certifications, and Product Specifications,
refer to Table 41.
If you need additional information that cannot be found in the manual, contact Global Customer
Support.
Programmers/Software Engineers
Review Chapter 2, “Product Overview”and the sections of Chapter 3, “Installation” and
Chapter 4, “Configuration”that pertain to wiring and communications functions. Refer to MI
018-888, Serial Communications Guide for 762C and 743CB Controllers, for detailed descriptions
of the controller protocol and communications functionality.
18
1. Quick Check
The purpose of this chapter is to:
 Verify that your controller is operating to factory specifications.
 Introduce you to the basic controller functions.
 Direct you to more detailed instructions.
The chapter is divided into the following major sections:
 “Seating the NOVRAM”
 “Connecting to Power Source”
 “Controller Display”
 “Changing the Display”
 “Reading Additional Information”
 “Looking for More Information?”
Figure 1. Rear Support for Controller
0.25-20
Bolt And Nut
(Supplied By
User)
Rear Support
(Supplied By
User)
Rear Panel Mounting Screws
(2 on each side)
Restricted wrench clearance.
Machine screw suggested
(slotted hex, pan head, or
fillister head).
1. Secure rear of housing to a support as shown in Figure 1.
2. Slide controller into housing until latch engages.
3. Secure latch release cover in place to help prevent inadvertent removal of controller.
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MI 018-885 – August 2018
1. Quick Check
!
CAUTION
EQUIPMENT OPERATION HAZARD
Once the controller has been placed in operation, do not withdraw it from the housing except
for service. When the controller is partly withdrawn, it is disconnected from the back panel and
the power source and the process is not controlled.
Failure to follow these instructions can result in injury or equipment damage.
Seating the NOVRAM
!
CAUTION
EQUIPMENT OPERATION HAZARD
The NOVRAM memory chip may be dislodged during shipping. Before connecting power,
verify that the NOVRAM is fully seated in the socket. If the NOVRAM is not properly seated
prior to power-up, the factory-set parameters may be corrupted when power is applied to the
controller.
Failure to follow these instructions can result in injury or equipment damage.
Figure 2. Seating the NOVRAM
Socket release lever – push up to lock
NOVRAM
Release Latch below keypad
After verifying that the NOVRAM is seated, continue to next item.
20
1. Quick Check
MI 018-885 – August 2018
Connecting to Power Source
The 762C controller can be ordered with an operating voltage of 24, 100, 120, 220, 240 V ac or
24 V dc. Verify that your power input is the same as indicated on the data label.
!
CAUTION
EQUIPMENT OPERATION HAZARD
Observe polarity on 24 V dc units.
Failure to follow these instructions can result in injury or equipment damage.
Figure 3. Connecting to Power Source
With ac supply
With dc Supply
L1 N(L2) Earth
_
(Ground)
+
Power Terminal Cover
(General Purpose)
Terminal Cover
(Division 2 Locations)
Power
Cord
Rear Support
Cable Strap
(Supplied by
user)
!
WARNING
EQUIPMENT OPERATION HAZARD
Protection against shock hazards requires power grounding. Failure to properly earth (ground)
this equipment could result in lethal voltages on exposed metal surfaces in the event of
equipment malfunction.
Failure to follow these instructions can result in injury or equipment damage.
21
MI 018-885 – August 2018
1. Quick Check
Controller Display
Unless you ordered an alternate configuration, the controller will display something similar to
that shown in Figure 4.
Figure 4. Controller Display
Upper Digital Display
762
0.0
Bargraph indicator to
identify variable
being displayed on
lower digital display
Lower Digital Display
Controller Fault
Indicator (Red LED,
Normally Not Visible)
Non-illuminated
20% Scale Markings
Set Point Indicator
M
Manual Status
Output Bargraph
Underrange Indicator
(Measurement Bargraph)
Operator Keypad
W/P
R/L
A/M
SEL
TAG
ACK
NOTE
The Controller Fault Indicator (red LED) is on only if the controller does not
function properly.
Notice that:
 The Upper Digital Display reads the configured Loop Tag (762 MICRO).
 The Lower Digital Display reads the same value as the Output Bargraph (0.0%).
 The bar graph indicator is above the Output Bargraph. The value of the output is
shown on the Lower Digital Display.
 The Auto/Manual Status Indicator displays M, which indicates that the unit is in
Manual mode.
 The Output Bargraph reads 0% of span.
 The Measurement Bargraph indicates that the measurement input is underrange.
 The Set Point Indicator reads 50% of span (default value).
22
1. Quick Check
MI 018-885 – August 2018
Changing the Display
To check out the panel display and to become familiar with the functions of the keypad (see
Figure 5), exercise the keys as described below.
Figure 5. Operator Keypad
W/P
R/L
A/M
SEL
TAG
ACK
The W/P and R/L keys are configured in the OFF position and are not functional at this time.
When configured, a W or P and an R or L appear on the display.
Using the A/M Key
The A/M key will transfer the controller between AUTO (A) and MANUAL (M). Try pressing
the A/M key. Return to MANUAL before proceeding. Notice that the bargraph indicator always
moves over the Output Bargraph when you transfer the controller to Manual and that it moves
over the Measurement Bargraph when you transfer to Auto.
Using the SEL Key
Try pressing the SEL key. Note that this causes the Digital Display to show the value for the Set
Point Indicator, or the Measurement Bargraph, or the Output Bargraph, depending on the
location of the bargraph indicator.
Manual Output
Press the SEL key to move the bargraph indicator to the Output Bargraph. You are now prepared
to adjust the controller output and to read the values on the Output Bargraph and the Lower
Digital Display.
Increase the output by pressing the  key. The Output Bargraph and the Lower Digital Display
will read the value you select.
To decrease the output, press the  key.
If you press/hold either the  or the  key while adjusting the manual output, the value changes at
an accelerated rate that depends on the duration of the hold.
It is not necessary to return the controller to the original values before proceeding to the next step.
Adjusting the Set Point
Press the SEL to move the bargraph indicator over the set point. The Measurement and Set Point
Indicator engineering unit labels are the same (PCT is factory default). Press the  or  keys to
adjust the set point. Note the set point value (shown on the lower display) and its corresponding
indicator change (each segment represents a 2% change in the value). Holding the key causes the
value to change at a faster rate.
23
MI 018-885 – August 2018
1. Quick Check
Reading Additional Information
Use the following keys to read the controller information.
Table 1. Keypad Functions
Key
Function
To enter the READ mode or to return to the operating mode.
TAG
To display the previous option
To display the next option
SEL
To back up through the menu.
ACK
To answer YES to a displayed question and to display the next parameter.
To READ controller information, use the procedure on the following page. Note that READ
mode does not affect operation of the controller.
762 MICRO
0.0
This is the digital display in normal position.
Press TAG
MENU
READ
?
Do you want to read available information?
Press ACK to read.
Press ACK
READ
VALUES
?
Do you want to read various values?
If NO, press
key. If YES, press ACK.
?
Do you want read the configuration?
See note below.
Press
READ
CONFIG
Press ACK twice
STRATEGY
ONE FUNC
?
Configuration Strategy?
Configured for one function.
Press ACK
CONFIG
FUNC 1 ?
Function 1 configuration?
Press ACK
FUNC 1
PI, PID
?
Function configured for either PI or PID (default
configuration).
Press ACK
PI, PID
=DISPLAY ?
Review controller display configuration?
NOTE
RD CONFIG and following items above are only available if SHOWOP RD CFG
was configured YES.
You can continue to read by pressing the ACK key. If you want to back up to a previous option,
press the SEL key. Pressing the  key repeatedly selects further options.
24
1. Quick Check
MI 018-885 – August 2018
Return to NORMAL
To return to normal operation at any time, press the TAG key. Note that no changes can be made
in the READ mode.
This completes the checkout procedure to verify that you have a functional unit as shipped from
our factory.
Looking for More Information?
For more detailed information, refer to the following sections of this manual:
For general installation information, refer to Chapter 3, “Installation”. For dimensional details,
refer to Appendix E.
For configuration instructions, refer to Chapter 4, “Configuration” and to Appendix B and
Appendix C.
For operating instructions, refer to Chapter 5, “Operation”.
For calibration, troubleshooting and maintenance information, refer to Chapter 7, “Calibration,
Troubleshooting, Maintenance”. For replacement parts and accessories, refer to the parts list in
Appendix D.
For information on serial communications programming, refer to
MI 018-888, Serial Communication Guide for 762C and 743CB Controllers.
For information about specifications and agency certifications, refer to Appendix A.
If you need additional help, please contact Global Customer Support.
25
MI 018-885 – August 2018
26
1. Quick Check
2. Product Overview
This chapter is a summary of the general characteristics of the product. Detailed specifications can
be found in Appendix A, “Specifications”.
The chapter is divided into the following parts:
 “Description”
 “Functional Block Diagram”
 “Front Panel”
Description
The 762CNA is a microprocessor-based controller that can perform proportional, integral, and
derivative (PID) control functions for two independent loops. The two loops can also be
configured to form a single-station cascade or auto-selector controller. In addition, the 762CNA
offers many enhanced control functions, such as EXACT tuning, totalizing, and comprehensive
calculation and logic capabilities.
As an alternative, you can configure the 762CNA as a single or dual auto/manual transfer station
or a single or dual 3-variable indicator. Control capability can be intermixed with either auxiliary
station type.
A fluorescent front panel display shows current values of control variables in bargraph format and
selected values in numeric form. It also displays an electronic loop tag, controller status, and alarm
status. A keypad, located on the front of the unit, is used for operator input and configuration
functions.
The front panel shows the status of Controller 1 (or Auxiliary Station) as Faceplate 1 and the
status of Controller 2 (or Auxiliary Station) as Faceplate 2. To change from one faceplate to the
other, press/hold the SEL key on the keypad.
The 762CNA mounts in a compact DIN housing designed for semi-flush panel mounting.
Terminations are located at the rear of the unit.
RS-485 serial communication enables complete supervisory capability from a host computer.
27
MI 018-885 – August 2018
2. Product Overview
Figure 6. Model 762CNA Controller.
Power and signal terminations at rear.
Compact panel-mounted DIN housing
Plug-in controller (inserted into
housing)
Faceplate display
Keypad
Functional Block Diagram
Figure 7 illustrates the inputs, outputs, and functions of a 762CNA Series station. Explanations
follow the block diagram. For more detailed information, refer to Appendix A, “Specifications”
and Appendix F, “Functional Diagram”.
Figure 7. Block Diagram of a 762CNA Control Station
Panel Displays
Frequency
Inputs (2)
Discrete
Inputs (2)
F1
F2
CI 1
CI 2
AOUT1 Analog
AOUT2 Outputs (2)
Input Signal Conditioning
RTD (100W Pt)
IN 1
IN 2
Analog
IN 3
Inputs (4)
IN 4
Function
1
with
Totalizer
2
with
Totalizer
Four Alarms
Calculations and
Logic Functions
Operator Keypad
28
Function
CO 1
CO 2
Discrete
Outputs (2)
Rs-485 Serial
Communication
2. Product Overview
MI 018-885 – August 2018
Inputs
Type
Qty.
Description
Analog
4
4-20 mA dc (May be changed to 1 - 5 V dc by removing input resistors.)
Assignable to any controller or function. A 100 Platinum RTD input can be
substituted for Analog Input 1 by adding a hardware option.
Frequency
2
1 to 9999 Hz, assignable to any function. May be combined into one up/down
pulse signal.
Discrete
2
5 V dc, 1 mA max, non-isolated contact or transistor switch inputs, assignable
to any function. Used for remote status changes such as
A/M, R/L, W/P, EXT ACK, tracking functions, and totalizer logic.
Outputs
Type
Qty.
Description
Analog
2
4-20 mA non-isolated, assignable to any function. Isolation option is available
for Output 1. Output 2 may be converted to 1 - 5 V dc by jumper selection.
Discrete
2
Non-isolated, open collector transistor switch outputs, assignable to alarm,
status, or Boolean logic functions. 50 V dc, 250 mA max.
Input Signal Conditioning
Type
Linear
Description
The conditioned signal is directly proportional to the input signal.
Square Root
The conditioned signal is proportional to the square root of the input signal.
Squared
The conditioned signal is proportional to the square of the input signal.
Characterizer 1
Signal conditioning modifies the input signal to match the characteristics of a
custom curve entered by the user (8 segments).
Characterizer 2
Signal conditioning modifies the input signal to match the characteristics of a
second custom curve entered by the user (8 segments).
Thermocouple
(Transmitter)
Signal conditioning linearizes the display to match the characteristics of a
standard thermocouple type (E, J, or K). For display purposes only.
RTD
Signal conditioning linearizes the display to match the characteristics of a
standard RTD type (IEC 100 or SAMA 100). For display purposes only.
Input Filter
A second-order Butterworth filter may be assigned to any input.
Alarms
Item
Quantity
Description
Four, assignable to any input or output signal or internal variable.
Type
2-level (high/high, low/low, or high/low) with adjustable deadband.
Form
Can be configured to activate on Absolute Value, Deviation from a reference
value, or Rate-of Change of a variable.
Action
Latching, nonlatching, or permissive (latching alarms require operator
acknowledgment. Nonlatching alarms may be acknowledged but are self
clearing when the alarm condition no longer exists. Permissive alarms do not
require acknowledgment)
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2. Product Overview
Calculations/Logic Functions
Calculation
Description
Boolean Logic
Five single and five dual gates are available for logic computation. Each gate
is configured by first selecting the logic and then selecting the source of each
input. Inputs may be contact inputs, alarm output states, status indicator
outputs, EXACT state, gate outputs, or three fixed states. (Refer to Table 10,
Gate Input List.) Gates 0 through 4 are single input gates user-configured as
DIRECT or NOT (inverse logic). Gates 5 through 9 are dual input gates, each
of which can be defined as: OR, NOR, AND, NAND, XOR, or XNOR.
Dynamic
Compensation
Lead/lag, impulse, and deadtime calculations with user-adjustable Gain, Input
Bias, Out Bias, and Deadtime.
The result of a dedicated calculation function can be passed through a
dynamic compensator, prior to signal distribution. The dynamic compensator
provides lead/lag with an impulse option, and dead time functions, each with
its individual follow switch. Functionally, dead time precedes lead/lag.
Using the dynamic compensator and the follow switches, you can implement
feedforward and other complex control applications easily and efficiently.
Algebraic
The 762CNA can perform up to three independent algebraic calculations.
Each may contain up to nine characters. The variables may include results of
other calculation blocks, scaled and conditioned inputs, and other internal
control signals. To configure an equation, enter one character at a time from
the keypad, following the usual rules of algebra, and a few easy-to-learn rules.
Controller Selections (Functions 1 and 2)
Type
Description
PID
Proportional (P), Integral (I), and Derivative (D) algorithm is standard for both
controllers. May be configured as P, I, PD, PI, or PID.
EXACT
EXACT control, the patented adaptive tuning system, is available on both
control loops, subject to totalizer configuration constraints.
Cascade
With this configuration, the output of Controller 1 is the set point of Controller 2.
Allows bumpless transfer between auto/manual and between remote/local set
point modes.
Batch
Either or both controllers can be configured for batch control, which helps
prevent controller windup when the controlled process is shut down.
Auto
Selector
The two controllers can be combined to provide a single auto-selected output
that can be used for constraint or dual mode control. The choice of lower,
higher, or logic-selected output is available. Feedback signals helps prevent
controller windup. You can configure one common or two independent
auto/manual functions.
Split Range
The two 4-20 mA outputs can be driven from a single controller. This allows
one measured variable to be controlled by two manipulated variables. A typical
application is a temperature control system in which both the heating medium
and the cooling medium are manipulated.
Remote or Local The set points of both controllers may be adjusted manually from the front
Setpoints
panel keypad or automatically from a remote device. Each remote set point can
be sourced to any signal in the Signal Distribution List (see Table 9). The R/L
key toggles between remote and local set point modes.
30
Panel or
Workstation
Supervision of the controller can be local (Panel) or remote (Workstation).
Other
Nonlinear extender, measurement and set point tracking, output tracking,
output multiplication or summing, external feedback, external output limits.
Dynamic compensation (lead/lag, impulse, deadtime) provides a capability for
implementing feedforward and other advanced control algorithms. Bypass of
the control algorithm by enabling the set point to manipulate the output directly.
2. Product Overview
MI 018-885 – August 2018
Totalizers (Functions 1 and 2)
Quantity
2
Description
Two 7-digit totalizers can be assigned to any internal or external signal. The
totalizers can be set to integrate up to a preset value or down from a preset
value, and to produce a logic output when the count equals the target value.
Totalization and EXACT tuning are mutually exclusive. (If Function 1 or Function
2 is configured for EXACT tuning, an associated totalizer is not available.) Each
totalizer has its own tag and engineering units label.
Station Configurations (Functions 1 and 2)
Configuration
Functions
Single
Function
Station
As a single-function station, Function 2 is not operative. Function 1 may be
any one of: PID, PID with EXACT, I ONLY, P/PD, 3-variable indicator, or
auto/manual station. If Function 1 is anything other than PID with EXACT, two
totalizers, TOTAL1 and TOTAL2, are available. If Function 1 is PID with
EXACT, TOTAL2 only is available.
Dual
Function
Station
As a dual-function station, both functions are operative. Both may be PID, PID
with EXACT, P/PD, I ONLY, 3-variable indicators, or auto/manual stations.
TOTAL1 is available if Function 1 is anything other than EXACT. TOTAL2 is
available if Function 2 is anything other than EXACT.
Single Station
Cascade
As a cascade control station, Function 1 is the primary controller and Function
2 is the secondary controller. Both may be PID with or without EXACT, P/PD,
OR I ONLY. TOTAL1 is available if Function 1 is anything other than EXACT.
TOTAL2 is available if Function 2 is anything other than EXACT.
Auto-Selector
Controller
As an auto-selector, both controllers may be PID, PID with EXACT, P/PD, OR
I ONLY.
Auto/Manual
Switching
Station
An Auto/Manual Station provides all of the features of a controller without the
control algorithm. Up to two auto/manual stations may be configured.
3-variable
Indicator
Station
Up to two 3-variable indicator faceplates are available. Each selected variable
has its own bargraph, digital display of engineering units, and loop tag display.
The 3-variable faceplates are mutually exclusive with controllers and
auto/manual stations. If only one controller or manual station is configured,
you may configure one 3-variable faceplate.
Other Features
Feature
Description
This optional accessory permits you to copy the configuration of one controller
“Copy
Configuration” for use in another controller. This is accomplished using two NOVRAMs
(nonvolatile, random access memory modules) and a configuration copy
Accessory
accessory device. To use this feature, simply turn off power, remove the
configured NOVRAM from the controller, install the copy accessory, plug the
configured NOVRAM and a second NOVRAM (to be configured) into the copy
accessory, and turn on power. The first NOVRAM is then copied into the second
for use in another controller. With minimum effort, any number of controllers can
thus be configured with the same parameter values as the original controller.
Individual parameters in each controller can then be easily changed to fit a
particular loop.
Actual
Output
Indication
The output bargraph and digital indicator can be configured to display the actual
4-20 mA output value by connecting the 4-20 mA output to an unused input and
assigning the output bargraph to that input.
Output
Reverse
The output, AOUT 1 or AOUT 2, can be configured to be a value equal to 100%
minus the actual output.
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MI 018-885 – August 2018
Feature
2. Product Overview
Description
RS-485 Serial The 762CNA controller is equipped with an RS-485 serial port for
Communicatio communication with most host computers, either directly or through an
RS-232/RS-485 converter or equivalent accessory. The protocol
ns Interface
conforms to ANSI Specification X3.28-1976, Subcategory E3. Using an RS-232
to RS-485 converter, up to 90 controllers can be accommodated by a single host
communication port. Serial communications capability includes
uploading/downloading of configuration, remote setting of Auto/Manual (A/M),
Remote/Local (R/L) status, manual output value, local set point values, polling of
all inputs and outputs, and writing as well as reading of all configurable
parameters. Both control loops are accommodated by the single port. You can
also select baud rate, parity, and panel or workstation (host) priority.
Passcode
Security
Using the keypad, you can read the values of inputs, alarm and limit settings,
and the current operating configuration. However, you can adjust only those
settings that were specified as operator-adjustable when the controller was
configured. To adjust the remaining parameters, you must enter a passcode from
the keypad. The passcode is determined by an authorized person at the time the
controller is configured. Thus, only those who have been given this passcode
can change any of the protected parameters. The passcode can be changed at
any time by the authorized person.
pH Display
The display of the measurement, local set point, or remote set point may be
displayed before or after the signal is characterized. If pH Display is activated,
the displays are before characterization. This feature is often used on pH
applications when it is important to read pH, but control be performed on
concentration.
Front Panel
The 762CNA controller can be configured and operated entirely from the front panel with no
external equipment. The panel consists of an alphanumeric display, a graphics display, status
indicators, an alarm indicator (horn symbol), and a keypad. Refer to Figure 8. A controller
faceplate is shown for illustrative purposes.
32
2. Product Overview
MI 018-885 – August 2018
Display Functions
Figure 8. Panel Display (Faceplate 1 or 2)
Upper Digital Display
Lower digital display
FIC 1002A
150.5 GPM
WP
Red LED Fault
Indicator (normally
not visible)
Workstation/Panel
Status
RL
Remote/Local
Set Point Status
Bargraph indicator
Overrange indicator
Setpoint Indicator
Left Bargraph
(Set Point)
Auto/Manual Status
Middle Bargraph
(Measurement)
AM
Alarm Indicator
Right Bargraph
(Output)
Underrange indicator
Keypad
W/P
R/L
A/M
SEL
TAG
ACK
The alphanumeric display at the top of the front panel has two lines of nine characters each,
5 mm (0.196 in) high, colored blue-green.
The graphics display consists of three bargraphs, each having 50 segments (each 2% of full scale)
plus a triangular pointer on top and bottom to indicate when the variable is either above or below
the range of the display. The bars are 55.4 mm (2.18 in) long. The left and center bargraphs are
5 mm (0.196 in) wide, and the right bar graph is 2.5 mm (0.098 in). All are colored blue-green.
The status characters (W/P, R/L, A/M) are 4 mm (0.157 in) high; the alarm symbol is 5 mm
(0.196 in) high. The status characters are colored blue-green; the alarm symbol is red. The
position of the bargraph indicator or “dot” identifies which variable is currently displayed on the
Lower Digital Display. To move the indicator to the next position, press (short press) the SEL
button.
33
MI 018-885 – August 2018
2. Product Overview
Keypad Functions
The keypad has eight keys as shown in Figure 9 and identified in the table below. The key
switches are single pole, normally open contacts, all closing to a common lead. For actuation, keys
must be pressed for a minimum of 200 ms (0.2 s).
Figure 9. Keypad
Key
W/P
R/L
A/M
SEL
TAG
ACK
Function
Pressing these keys moves you forward and backward through menu items and
functions, and permits you to adjust parameter values. Also use these keys to
increase and decrease set point and manual output values.
W/P
When W/P is configured, pressing this key toggles between Workstation and
Panel mode. In Workstation mode, the controller is supervised from a remote
workstation via the serial communication port. In the Panel mode, the controller
is locally supervised. This key is disabled when the unit is configured for
workstation priority and when W/P is routed to any selection from the Gate Input
List.
R/L
When R/L is configured, pressing this switch toggles between Remote (R) and
Local (L) set point operation. This key is disabled when the controller is in the W
mode and when R/L is routed to any selection from the Gate Input List.
A/M
Pressing this key toggles between Auto (A) and Manual (M) operation. When
transferring from A to M, the bargraph indicator light automatically selects the
Output Bargraph for alphanumeric display. When transferring from M to A, it
selects the Measurement Bargraph. This key is disabled when the controller is in
the W mode and when A/M is routed to any selection from the Gate Input List.
SEL
(Short press)
A short press (200 to 300 ms selects the next variable for display on the Lower
Digital Display (alphanumeric). Also provides access to remote set point, ratio,
and totalized count, when so configured.
SEL
(Long Press)
A long press (300 ms) toggles between Faceplates 1 and 2, provided they are
configured and active. If only one faceplate is configured, the key performs the
same functions as a short press.
TAG
Pressing this key causes the controller to exit from the faceplate display and
enter the User Interface. If the controller is in W mode, this key is disabled.
ACK
In NORMAL mode, pressing this key acknowledges an alarm condition, causing
the indicator to change from flashing to steady. This key is functional in both W
and P modes.
A keypad disable link is provided to help prevent unauthorized tampering in remote unmanned
locations.
34
3. Installation
This chapter provides all information necessary for installing the controller. It is divided into the
following major sections:
 “Important Precautions”
 “Unpacking”
 “Controller Identification”
 “Positioning Links”
 “Installation Procedure”
 “Signal Wiring Guidelines”
 “Input Signal Wiring”
 “Output Signal Wiring”
 “Serial Communication Wiring”
 “Power Wiring”
 “Accessory Equipment”
Important Precautions
Shock Hazards
WARNING
HAZARD OF ELECTRICAL SHOCK OR EXPLOSION
!
This product operates from hazardous voltage power sources. Hazardous voltage points are
labeled and/or covered within the enclosure. For your own safety, please observe these warnings
and replace all protective covers after servicing.
Failure to follow these instructions can result in death or serious injury.
35
MI 018-885 – August 2018
3. Installation
Explosion Hazards
!
WARNING
EXPLOSION HAZARD
Certain versions of this product are designed for use in Class I, Division 2 hazardous locations.
If you have one of these versions, never connect or disconnect power wiring or field wiring
unless the area is known to be nonhazardous. Doing this in the presence of an explosive gas-air
mixture could result in an explosion.
Failure to follow these instructions can result in death or serious injury.
Unpacking
1. Remove the controller from its shipping container and check for visible damage.
2. Remove the mounting brackets.
3. Save the container until you determine that no shipping damage has occurred.
4. If no damage is observed, proceed with installation.
5. If the controller has been damaged, notify the carrier immediately and request an
inspection report. Obtain a signed copy of the report from the carrier and contact
Global Customer Support.
Controller Identification
The data plate, located on top of the chassis, contains information specific to your controller. A
typical data plate is shown in Figure 10.
Figure 10. Typical Data Plate
MODEL
762CNA-AT
ST. AA
CERT SPEC
REF NO.
94F30110-1-1
ORIGIN
CAUTION: USE ONLY WITH
120 V ac, 50/60 Hz
VA
CUST. DATA
15
SUPPLY
Model
Style (Hardware, Firmware)
Electrical Classification Code (see Note)
Sales No. (if applicable)
Date and Plant of Manufacture
Supply Voltage and Frequency
Power Consumption
User Information
NOTE: Blank space indicates Ordinary Location
Classification
36
3. Installation
MI 018-885 – August 2018
Positioning Links
The controller 2 output (AOUT 2) and keyboard enable/disable functions are link-selectable as
shown in Table 2. The links have been positioned in the factory in the 4-20 mA output and
keypad enable positions. The links are located on the main printed wiring assembly (PWA) as
shown in Figure 11.
!
CAUTION
HAZARD OF EQUIPMENT DAMAGE
Turn off controller power before positioning links. Repositioning links with power on can
damage components.
Failure to follow these instructions can result in equipment damage.
Figure 11. Link Locations
P53
P55
P52
P56
P57
P54
Table 2. Link Locations
Function
Setting
Link Position
Keypad
Enable/Disable
Enabled
P55 - P56
Disabled
P56 - P57
AOUT 2
Output
1 - 5 V dc
P52 - P54
4 to 20 mA
P52 - P53
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MI 018-885 – August 2018
3. Installation
Installation Procedure
The controller is shipped in its housing, which mounts in a DIN panel cutout. For exact cutout
dimensions, refer to the Dimensional Print in Appendix E.
NOTE
If you plan to use 1-5 V dc instead of 4-20 mA on some inputs, you will have to
remove the 250 resistors across the selected input terminals. Although it is usually
more convenient to do this before installing the housing in the panel, you may also do
it after installation. Refer to “Removing Input Range Resistors” on page 40 for
instructions.
!
CAUTION
HAZARD OF EQUIPMENT DAMAGE
Be sure that installation complies with all applicable codes, safety regulations, and certification
requirements. For product specifications, refer to Table 41.
Failure to follow these instructions can result in equipment damage.
The installation procedure is as follows:
1. Remove the controller from its housing and set it aside. To do so, loosen the latch
release screw and swing cover down, press the latch (below the keypad) and slide the
controller out of the housing, as shown in Figure 12.
Figure 12. Removing Controller from Housing
Printed wiring assembly,which carries input termination resistors*
Power
Terminals
Threaded
shaft
Terminal Block for wire connections
Rear Support
and cable restraint
*To remove termination resistors,
remove back panel assembly per instructions
Transformer
Connectors
Printed Wiring Assembly
NOVRAM
Latch Cover**
Latch**
**Loosen cover with screwdriver.
Press latch to release controller
from housing.
2. Mount the housing in the panel cutout. Attach upper and lower mounting brackets to
housing by inserting tabs on brackets into slots in housing, as shown in Figure 13.
(Note that upper bracket can be mounted only on top of housing; and lower bracket
can be mounted only on bottom of housing.) Tighten threaded shaft in each
mounting.
38
3. Installation
MI 018-885 – August 2018
Figure 13. Mounting of Controller
Upper Mounting Bracket
Tab
Threaded Shaft
Panel
Slot
Flange
Lower Mounting Tab
3. Secure rear of housing to a support as shown in Figure 14.
Figure 14. Rear Support for Controller
0.25-20
Bolt and Nut
(Supplied By
User)
Rear Panel Mounting Screws
(2 on each side)
*Restricted wrench clearance.
Machine screw suggested
(slotted hex, pan head, or
fillister head).
Rear Support
(Supplied By
User)
4. Slide controller into housing until latch engages.
5. Secure latch release cover in place to help prevent inadvertent removal of controller.
!
CAUTION
EQUIPMENT OPERATION HAZARD
Once the controller has been placed in operation, do not withdraw it from the housing except
for service. When the controller is partly withdrawn, it is disconnected from the back panel and
the power source and the process is not controlled.
Failure to follow these instructions can result in injury or equipment damage.
39
MI 018-885 – August 2018
3. Installation
Removing Input Range Resistors
To modify an analog input to accept a 1-5 V dc signal, you must remove the 250 input range
resistor connected across the terminals of that input. Removing a resistor requires that you remove
the rear panel assembly from the rear of the controller housing in order to gain access to the
resistors.
To remove input range resistors for selected inputs, execute the following procedure:
1. Disconnect power from the housing.
2. Remove the controller from the housing.
3. Unbolt the rear support for the housing.
4. Remove the four mounting screws at the rear of the housing that secures the back
panel assembly to the housing.
5. Gently pull the rear panel assembly away from the rear of the housing until you have
access to the input range resistors.
Note that the resistors are identified by markings on the board as AI1, AI2, AI3, and AI4,
which mean Analog Input 1, Analog Input 2, etc. Using wire cutters, snip the desired
resistor(s) from the circuit.
6. After verifying that the board is clean, reinstall the back panel assembly into the
housing, using the four mounting screws.
Figure 15. Removing Input Range Resistors
Printed Circuit Board
(inside view)
at rear of housing
Termination Resistors (4)
Cut leads to remove from
circuit.
AI3
AI2
Rear Panel Assembly
AI4
AI1
Connectors
7. Bolt the housing to the rear mounting support.
40
Rear panel mounting screw (4 places)
3. Installation
MI 018-885 – August 2018
8. Slide the controller back into the housing, secure the latch release cover, and reconnect power.
Signal Wiring Guidelines
!
CAUTION
HAZARD OF EQUIPMENT DAMAGE
Except for the 4 to 20 mA isolated output module, all inputs, outputs, and the transmitter
power supply share a non-isolated, common, ungrounded reference line. This line will be
normally connected to plant ground (or some other reference point) by external wiring schemes
adopted by plant practices. In doing this, care must be exercised that such grounding shall only
occur at a single point, and by single connection of “common” to the designated reference point
(plant ground).
Multiple connections of “common” lines to various grounding locations will result in ground
loops and give rise to improper unit operation. Similar problems will occur if multiple
grounding is made both at the 762CNA 743CB and at the receiver/transmitter locations.
Failure to follow these instructions can result in equipment damage.
Connecting Wires to Terminals
762C controllers have compression type terminals as shown in Figure 16.
Figure 16. Connecting Wires to Terminals
Terminal Screw
Wire
Clamp Jaw
To connect a wire to one of these terminals:
1. The controllers are shipped from the factory with the terminal clamp jaws fully open.
If, however, the jaw is closed, turn the terminal screw counterclockwise until the
clamp jaw is fully open.
2. Insert stripped wire into clamp jaw as shown. Recommended wire strip length is 1.4
cm (0.5 inches).
3. Turn terminal screw clockwise to tighten clamp.
4. Verify that clamp grips only the metal wire and not the insulation. Also verify that the
wire is secured in place after tightening clamp. Recommended installation torque is
3.39 to 5.42 N-m (2.5 to 4.0 lb-in).
41
MI 018-885 – August 2018
3. Installation
Wiring to Controller
Terminal locations are shown in Figure 17. Wiring connections for the 32 terminals are shown in
Table 3 through Table 5. Examples of typical wiring configurations are shown in Figure 19
through Figure 25. After connecting the signal wires, secure them with a cable strap to the rear of
the controller as shown in Figure 17.
Figure 17. Terminal Identification
Controller
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Terminal Strips
Cable Strap
(supplied by user)
Signal Cable
Rear Mounting
Bracket
Input Signal Wiring
This section describes installation of input signal wiring for all types of inputs.
Input Signal Terminal/Wire Designations
Table 3 designates input signal terminals by terminal number. For examples of typical input signal
wiring circuits, refer to the applicable section following Table 3.
Table 3. Terminal and Wire designations for Input signal Wiring
Terminal
Number
Function
42
Internal dc Power for 4-20 mA Transmitter (+): (a)
Internal dc Power for 4-20 mA Transmitter (+): (a)
Common for Internal dc Power:
1
17
3, 6 and 19
Analog Input 1(+): (b)
Analog Input 1 (–): (b)
2
4
Analog Input 2 (+): (b)
Analog Input 2 (–): (b)
5
7
Analog Input 3 (+): (b)
Analog Input 3 (–): (b)
21
23
Analog Input 4(+): (b)
Analog Input 4(–): (b)
18
20
3. Installation
MI 018-885 – August 2018
Table 3. Terminal and Wire designations for Input signal Wiring (Continued)
Function
Terminal
Number
Frequency Input 1 from Flowmeter; or Pulse-Up Input from Computer for Set Point
Frequency Input 2 from Flowmeter; or Pulse-Down Input from Computer for Set Point
Common for Frequency or Pulse Inputs:
Frequency Input 1 (+) for Controller-Powered Flowmeter:
Frequency Input 2 (+) for Controller-Powered Flowmeter:
15
13
14
16
12
RTD;Temperature Measurement
Blk Wire:
Grn Wire:
Wht Wire:
9
10
11
RTD; Temperature Difference Measurement
Wht Wire (Reference Sensor):
Grn and Blk Wires (Act. & Ref. Sensors):
Wht Wire (Active Sensor):
9
10
11
Contact Input 1:
Contact Input 2:
Contact Input Common:
29(+)
28(+)
30
a. Unit can supply power for up to two 4 to 20 mA transmitters.
b. 4-20 mA, field convertible to 1-5 V dc.
43
MI 018-885 – August 2018
3. Installation
Analog Input Signal Wiring
Examples of analog input signal wiring for the 32-position terminal block are shown in Figure 18.
Figure 18. Examples of Analog Input Signal Wiring
Self-Powered Signal Sources
CONTROLLER
TERMINALS
SOURCES
INPUT 1
INPUT 2
INPUT 3
INPUT 4
RED
+
GRA
(-)
RED
+
GRA
(-)
RED
+
GRA
(-)
RED
+
GRA
(-)
2
4
5
7
21
23
18
20
Controller-Powered 4-20 mA Transmitters
SOURCES
RED
INPUT 1
GRA
+
(-)
CONTROLLER
TERMINALS
1 or 17(b)
2
3,6, or 19
JUMPER
INPUT 2
4
RED
+
GRA
(-)
1 or 17(b)
5
3,6, or 19
JUMPER
INPUT 3
7
RED
+
GRA
(-)
1 or 17(b)
21
3, 6, or 19
JUMPER
INPUT 4
23
RED
+
GRA
(-)
1 or 17 (b)
18
3, 6 or 19
JUMPER
44
20
NOTES:
a. Standard controllers can supply power to two
4-20 mA transmitters.
b. If controller power is used for two transmitters,
connect (+) wire of one trans-mitter to
Terminal 1; connect (+) wire of other
transmitter to Terminal 17.
c. Make a note of which signal is connected to
each input. The information will be required
during configuration.
3. Installation
MI 018-885 – August 2018
Frequency Input Signal Wiring
Examples of frequency input signal wiring of controller are shown in Figure 19 through Figure
22.
Figure 19. Examples of Frequency Input Signal Wiring for E83 Vortex Flowmeter
EXTERNALLY POWERED VORTEX FLOWMETER:
E83 In Hazardous Location
E83 In Ordinary Location
Vortex Flowmeter Terminals
Ordinary Non-hazardous
Hazardous Location
MTL Model 779
Intrinsically-safe
+
External
Power
Supply
+
-
Controller
15(13)
15(13)
Pulse
14(14)
14(14)
Input 2
Input 1
Controller-powered
+
Regulated
24 V dc Supply
1
3
2
4
Pulse
Vortex
Flowmeter
--
Earth (Ground)
Bus
Vortex Flowmeter:
Vortex Flowmeter Terminals
+
A
B
Controller Terminals
+
1 (17)
15(13)
Pulse
-
14(14)
Input 1
Input 2
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MI 018-885 – August 2018
3. Installation
Figure 20. Examples of Frequency Input Signals from 81 or 82 Turbine Flowmeter with PA108,
PA109, or A2020LA Preamplifier
CONTROLLER-POWERED PREAMPLIFIER
EXTERNALLY POWERED PREAMPLIFIER
PREAMPLIFIER
TERMINALS
PREAMPLIFIER
TERMINALS
CONTROLLER
TERMINALS
CONTROLLER
TERMINALS
INPUT
15(13)
OUTPUT
14(14)
_
15(13)
_
15 to
30 V dc
INPUT 1
1(17)
+
SHIELDED CABLE IS
REQUIRED WITH
PREAMPLIFIER
A2020LA, STYLE A.
USE PART N0138BY
OR EQUIVALENT.
15 TO 30 V
DC SUPPLY
INPUT 2
SHIELDED CABLE IS
REQUIRED WITH
PREAMPLIFIER
A2020LA, STYLE A.
USE PART N0138BY
OR EQUIVALENT.
TURBINE
TURBINE
FLOWMETER
14(14)
15 to
+ 30 V dc
_
+
Figure 21. Examples of Frequency Input Signals from 81 or 82 Turbine Flowmeter with
PA-106A Preamplifier
EXTERNALLY POWERED PREAMPLIFIER
CONTROLLER-POWERED PREAMPLIFIER
PREAMPLIFIER
TERMINALS
CONTROLLER
TERMINALS
_
+
15(13)
_
1(17)
+
GND
_
20 TO 28 V
DC
R
CONTROLLER
TERMINALS
+
15(13)
14(14)
GND
1
2
PREAMPLIFIER
TERMINALS
2
INPUT 1
INPUT 2
INPUT 1
1
SUPPLY VOLTAGE
20 V DC
24 V DC
28 V DC
TURBINE
FLOWMETER
46
TURBINE
FLOWMETER
INPUT 2
VALUE OF R
400 , 2 W
600 , 2 W
800 , 2 W
3. Installation
MI 018-885 – August 2018
Figure 22. Examples of Frequency Input Signals from
Self-Powered Flow Transmitter and Positive Displacement Meters
FREQUENCY INPUT SIGNAL
FROM POSITIVE DISPLACEMENT METER
FREQUENCY INPUT SIGNAL
FROM SELF-POWERED FLOW TRANSMITTER
CONTROLLER-POWERED
CONTROLLER
TERMINALS
CONTROLLER
TERMINALS
POSITIVE DISPLACEMENT
METER CONTACTS
15(13)
16(12)
15(13)
EARTH
(GROUND)
INPUT 2
INPUT 1
EXTERNALLY-POWERED
HIGH
FLOW
TRANSMITTER
14(14)
INPUT 1
INPUT 2
CONTROLLER
TERMINALS
POSITIVE DISPLACEMENT
METER CONTACTS
14(14)
15(13)
680
2W

_
INPUT 1
24 V DC MAX.
SUPPLY
INPUT 2
+
Pulse Input Wiring
762C Series Controllers can have pulse input signal for remote supervisory control of set point or
for certain remote, direct digital control (DDC) backup of output. Examples of pulse input signal
wiring are shown in Figure 23.
Figure 23. Examples of Pulse Input Wiring for Remote Set Points
SELF-POWERED
CONTROLLER
TERMINALS
EXTERNALLY-POWERED
CONTROLLER
TERMINALS
PULSE UP
15
+
PULSE UP
15
_
14
_
13
PULSE DOWN
PULSE DOWN
13
+
14
CONTROLLER-POWERED
CONTROLLER
TERMINALS
*500
PULSE UP 1500
+
-
 MIN.
MAX
+24
V DC
_ MAX.
16
*RESISTORS SUPPLIED BY USER
14
*500
1500
PULSE DOWN
 MIN.
MAX
MINIMUM CONTACT RATING: 25 mA
12
47
MI 018-885 – August 2018
3. Installation
RTD and Contact Input Wiring
Examples of RTD and contact input signal wiring of controller are shown in Figure 24. To use an
RTD, the RTD Input Option must be installed and Analog Input 1 Terminals 2 and 4 must be
disconnected.
Figure 24. Examples of RTD and Contact Input Signal Wiring
RTD INPUT SIGNALS (a)
TEMPERATURE MEASUREMENT (b)(c)
TEMPERATURE DIFFERENCE
MEASUREMENT (b)(d)
WHITE
WHITE
CONTROLLER
TERMINALS
ACTIVE
RTD
RTD
CONTROLLER
TERMINALS
11
11
GREEN
BLACK
GREEN
BLACK
BLACK
GREEN
10
REF.
RTD
9
10
9
WHITE
a.
RTD Input Option is dedicated to Input 1.
b.
Diagrams show wire colors for RTDs.
c.
To maintain specified accuracy, RTD extension wires must all be the same
length and gauge.
d.
With temperature difference measurement, the reference RTD is used for the
lower temperature.
CONTACT INPUT SIGNALS
CONTROLLER
TERMINALS
CONTACTS
INPUT 1
+
29
COMMON
30
INPUT 2
+
28
OPEN CIRCUIT VOLTAGE = +6 V MAX
48
3. Installation
MI 018-885 – August 2018
Output Signal Wiring
Output Signal Terminal/Wire Designations
Table 4 designates output signal terminals by terminal number. For examples of output signal
wiring, refer to Figure 25.
Table 4. Output Signal Terminal and Wire Designations
Terminal
Number
Function
Control Output Signal #1; 4-20 mA (+):
Control Output Signal #1; 4-20 mA (–):
26
27
Control Output Signal #2; 4-20 mA(+) or 1-5 V dc (+):
Control Output Signal #2; 4-20 mA(-) or 1-5 V dc (-):
8
6
Contact Outputs: Open collector switch (NPN) output.
Contact Outputs 1 and 2 can be configured by user for the following:
Remote Status Indication of A/M, R/L, W/P, Alarms,
EXACT Algorithm, Contact Inputs, Gate Outputs, Auto Selector Status, Totalizer
Status.
32 (+)
31 (+)
30 (–)
Contact Output 1:
Contact Output 2:
Common for Contact Outputs:
Output Signal Wiring Examples
Examples of output signal wiring are shown in Figure 25.
Figure 25. Examples of Output Signal Wiring of Controller
Contact Output Signals
(a)
RECEIVER
CONTROLLE
R
OUTPUT 1
32
30
+
50 V DC
MAX.
NOTE:
a. Maximum contact capacity is
250 mA. If receiver/supply
voltage combination results in a
current in excess of 250 mA, add
appropriate current limiting
resistor. Resistor not required for
loads less than 250 mA.
_
31
RECEIVER
OUTPUT 2
(a)
Output Signal #2
Output Signal #1
+
RECEIVER
COM _
_
26
27
CONTROLL
ER
RECEIVER
+
COM _
8
6
CONTROLL
ER
49
MI 018-885 – August 2018
3. Installation
Serial Communication Wiring
This section describes installation of wiring for serial communication functions. Refer to “Serial
Communications” on page 101 for important configuration details. For detailed programming
information, refer to MI 018-888, Serial Communication Guide for 762C and 743CB Controllers.
Terminal/Wire Designations
Table 5 designates terminals for serial communications wiring by terminal number for a
controller. For examples of serial communications wiring, refer to the next section. If controller
has optional surge protection, see “Accessory Equipment” on page 51 for wiring details.
Table 5. Serial Communications Terminal/Wire Designations
Function
Terminal No.
RS-485-A Serial Connection:
RS-485-B Serial Connection:
Potential Equalization Terminal:
24 (+)
25 (–)
22
RS-485 is used for serial communication of measurement, set point, output, alarm,
and status signals. Maximum number of controllers that can be connected in a
single loop is 30. Maximum accumulated cable length is 1.5 km (5000 ft).
Wiring to an RS-485 Interface
Figure 26 shows an example of 762C controller terminal serial communications wiring to an
RS-485 Interface. If a RS-232 to RS-485 Converter is used, refer to “RS-232/RS-485 Converter”
on page 53 for additional details. Use twisted-wire pair for serial communications wires A and B.
If screened (shielded) cable is used, connect screens to system earth (ground).
Figure 26. Serial Communications Wiring of Controller
CONTROLLER
NO. 1 (A)
RS-485
(SUPPLIED
BY USER)
CONTROLLER
NO. 2 (A)
A(+)
24
A(+)
24
A(+)
24
B(-)
25
B(-)
25
B(-)
25
POTENTIAL
EQUALIZATION
TERMINAL
22
22
(A) IF CONTROLLER HAS OPTIONAL SURGE PROTECTION, SEE
“ACCESSORY EQUIPMENT” ON PAGE 51 FOR WIRING DETAILS.
(B) IF SCREENED (SHIELDED) CABLE IS USED, MAKE SYSTEM
EARTH CONNECTION AT ANY SINGLE POINT ALONG THE SHIELD
RUN.
50
TOTAL OF 30
CONTROLLERS
22
SYSTEM
EARTH
(GROUND) (b)
3. Installation
MI 018-885 – August 2018
Power Wiring
To connect power wires to the controller, complete the following procedure.
1. Remove protective cover from terminals on rear of controller as shown in Figure 27.
2. Connect wires to applicable terminals as shown.
3. Secure cable to rear of controller with a cable strap as shown.
4. Reinstall protective cover over terminals.
WARNING
HAZARD OF ELECTRICAL SHOCK OR EXPLOSION
!
Protective cover must be installed over power terminals.
All wiring must conform to local electrical code requirements.
The power earth (ground) terminal must be connected to the ground point serving the branch
circuit powering the unit.
Power wiring must be kept separate from low voltage field circuit wiring.
Failure to follow these instructions can result in death or serious injury.
Figure 27. Power Wiring to Controller
With ac Supply L1 N(L2) Earth
_
(Ground)
With dc Supply +
Power
Cord
Power Terminal Cover
(General Purpose)
(Part No.K0143AH)
Terminal Cover
(Division 2 Locations)
(Part No.K0143DU)
Rear Support
Cable Strap
(Supplied by
user)
Accessory Equipment
This section describes the installation of common accessory devices, such as a surge suppressor, an
RS-232/RS-485 converter, and an Opto-22 converter.
51
MI 018-885 – August 2018
3. Installation
Optional Surge Suppressor
Surge protection is sometimes required with serial communications (RS-485) wiring. If input
wiring is located near transient-producing sources, such as motors, solenoids, or high voltages,
surge protection may be required.
To install a surge suppressor, execute the following procedure:
1. Disconnect power source from controller (or disconnect power by pulling controller
from housing).
2. Remove protective cover if there is one (used only for Division 2 locations) from
terminal blocks located on rear of controller.
3. Install surge suppressor assembly in terminal blocks as shown in Figure 28.
Figure 28. Installation of Optional Surge Suppressor
Power
Terminal Cover
Surge Suppressor
(Part No. L0122HS)
B(-)
A(+)
S
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
4. Connect wires referenced in Figure 26 to the corresponding terminals on the
suppressor assembly. For input wiring to the surge suppressor, use twisted-wire pair.
Input Wiring to Surge Suppressor
1. Connect wires from RS-485 to terminals of surge suppressor as shown in Figure 28.
Use twisted-wire pair.
2. If screened (shielded) cable is used, connect screen to system earth (ground).
52
3. Installation
MI 018-885 – August 2018
RS-232/RS-485 Converter
The RS-232 to RS-485 Converter provides the interface between the RS-485 field-wiring
(twisted-wire pairs) and the RS-232 communications for the host computer, as shown in Table 6.
Table 6. RS-232/RS-485 Converter Specifications
Item
Specification
Supply Voltage
Limits
120, 220, or 240 V ac +10% and -15%. Supply voltage as specified in
sales order.
Supply Frequency
Limits
50 or 60 Hz; ±3 Hz.
Inputs
Accepts up to three independent RS-485 twisted-wire pairs. Each pair
can have up to thirty controllers connected to it.
The other input is the RS-232 connection to the host computer.
Connections
Terminal block for RS-485 twisted-wire pair terminations and 25-pin
D-type connector for RS-232 cable.
Wiring
This section gives wiring details of the RS-232 to RS-485 Converter used for serial
communications with the controller.
Wiring to Controllers
Controller connections are made to the rear of the converter at the RS-485 interface shown in
Figure 29 on page 54. Table 7 shows the function of each terminal of the RS-485 interface. Note
that terminals are arranged in redundant pairs (links). For example, terminals 1 and 3 are
electrically the same; terminals 2 and 4 are electrically the same. Each redundant pair will support
up to 30 controllers. The maximum number of controllers that can be connected to the converter
using all three links is 90.
Table 7. RS-485 Terminal Connections on RS-232/485 Converter
Converter
Terminal Numbers
Function
Sample Device Addresses (a)
1 and 3 (+)
2 and 4 (–)
Interface for up to 30 Devices
1 through 30
5 and 7 (+)
6 and 8 (–)
Interface for up to 30 Devices
31 through 60
9 and 11 (+)
10 and 12 (–)
Interface for up to 30 Devices
61 through 90
13
RTS Signal
---
14
Case Earth
(ac Ground)
---
a. Addresses shown are for illustration only. Actual addresses are assigned by the user. Any address
may be connected to any terminal pair.
NOTE
For each link, 30 controllers can be either connected to a single terminal pair or split
between terminal pairs in any combination totaling 30 (Arrangement A in Figure 29).
53
MI 018-885 – August 2018
3. Installation
The preferred field wiring arrangement (chain arrangement) is shown as Arrangement A in Figure
29 on page 54. Note that, with Arrangement A, a break in either the (+) or (-) wire run
disconnects all instruments on the remote side of the break.
As an option, any of the following field wiring arrangements can be used.
 A “ring” arrangement can be connected to any of the three terminal groups by using
plus-to-plus and minus-to-minus wiring.
 A “star” arrangement can be connected to any of the three terminal groups by using a
junction box.
Figure 29. RS-232 to RS-485 Converter Signal Wiring
RS-232 TO RS-485
CONVERTER
1
+
2
_
3
+
4
_
5
+
6
_
7
+
8
9
10
_
11
+
12
13
14
RS-232
INTERFACE
(TO COMPUTER)
_
60
CONTROLLER
ADDRESS
00
16
31
01
22
32
37
02
23
33
36
34
35
03
61
90
JUNCTION
BOX
62
15
ARRANGEMENT A
(CHAIN ARRANGEMENT)
PREFERRED
54
63
30
30 CONTROLLERS MAXIMUM
64
30 CONTROLLERS MAXIMUM
ARRANGEMENT B
(RING ARRANGEMENT)
30 CONTROLLERS MAXIMUM
ARRANGEMENT C
(STAR ARRANGEMENT
FROM JUNCTION BOX)
3. Installation
MI 018-885 – August 2018
OPTO-22 Board Model AC24 Converter Card
Interface Requirements
The following details are included for information only, to assist users in interfacing their
OPTO22 cards to controllers. The information presented is applicable to the current OPTO22
AC24 family requirements and may or may not be applicable to future design introductions.
Requirements may also vary, depending on configuration and/or other devices connected to the
network. For this reason, it is emphasized that the data presented is for guidance only; no
warranty or guarantee of any kind is implied.
For complete details of the AC24 converter card, address, interrupt, and communications
jumpers, consult the manufacturer's specifications. For controller connections, refer to Figure 26.
Configuration
Before installing your AC24, configure your board by selecting the appropriate address, interrupt,
and communications jumpers, as shown in Figure 30.
The host PC is set up to use one asynchronous communications port, COM1 or COM2.
Figure 30. Cable Connections to 9-Pin Male RS-485 Connector
COM1
COM2
C
B
1
1
7
1
7
IRQ2
IRQ7
IRQ6
IRQ5
COM1
COM2
CTS DIS
NOT INSTALLED
7
3
3
COM
IRQ2
IRQ7
IRQ6
IRQ5
COM1
COM2
CTS DIS
9
OPTO 22
AC24
LEGEND:
1
7
A
A
COM
C
B
EARLIER VERSIONS OF AC24
DO NOT HAVE THIS JUMPER
SEE NOTES
OPTO 22
AC24
9-PIN
MALE
CONNECTOR
INSTALLED
NOTES:
1. MAKE CONNECTIONS BETWEEN PINS 4 AND 8,
AND PINS 5 AND 9.
2. “A” AND “B” ARE TWISTED-PAIR WIRES.
A8
9
1
2
3
4
5
6
COMMON
7
8
9
“A” (TX/RX+)
“B” (TX/RX-)
TO
CONTROLLER
REAR
TERMINAL
PANEL.
REFER TO
FIGURE 26 OR
FIGURE 30.
55
MI 018-885 – August 2018
56
3. Installation
4. Configuration
This chapter describes all configuration options and defines procedures for implementing them. If
you have not yet read Chapter 2, “Product Overview”, we suggest that you do so before
proceeding.
This chapter is divided into the following major sections:
 “Introduction”
 “Common Configuration Functions”
 “Alarms”
 “Alternate Station Configurations”
 “Additional Configuration Functions”
 “Configuration Copy Accessory”
Introduction
Configuration is the process of enabling functional capability in the controller firmware for a
specific application. This section will enable you to systematically determine, record, and
configure the value or status of each parameter required for your application. Whether you have a
controller with standard default values or one with factory pre-configured default values, you can
reconfigure your controller to meet your specific requirements. Most applications require only
simple variations to the default values and statuses already entered.
The following material will help you to configure your controller:
 Appendix B, “Configuration Worksheets”
 Appendix C, “Structure Diagrams”
 Appendix F, “Functional Diagram”
Planning Your Configuration
There are two common approaches to configuring your controller. One is to first identify and
record all the changes you need to make to the default configuration and then to implement
them. This approach is preferred because there is less need to move around in the product
structure. However, you may prefer to implement each change as you identify it.
Appendix B will be especially important in planning your configuration. It is primarily a
worksheet whose content is described below:
57
MI 018-885 – August 2018
4. Configuration
Table 8. Content of Configuration Worksheet
Structure
Diagram
Location
Direction to
parameter on
specific sheet
of Appendix C
and to
horizontal and
vertical
coordinates
on that sheet.
Prompt/
Parameter
Parameter
Limits
Prompts to
parameters in
the order they
are displayed
when menu
structure is
sequenced
step by step.
Limits of
each
parameter
with units as
applicable.
Standard
Factory
Configuration
User
Configuration
Standard factory Column for you
configuration as to record your
shipped from
configuration.
the company.
Remarks
and Notes
Additional
information
and space for
your
notations.
As you determine changes that must be made to the standard factory configuration (default)
values for your application, record them in the User Configuration column of this worksheet.
Throughout the Configuration section of this instruction, you will find location designators (e.g.,
2 - A3). These direct you to the parameter you are looking for in the structure diagram in
Appendix C. In the example given, the 2 refers to the diagram beginning with Balloon 2 in the
upper left corner. The designation A3 refers to map coordinates on that diagram.
NOTE
Diagrams in Locations 2, 3, 6, and 7 are so simple that map coordinates are not used.
More detailed information on using the structure diagrams is located in the beginning of
Appendix C.
During configuration, you will need to access various signals such as inputs, outputs,
measurements, set points, and calculated values. These are located in a Signal Distribution List
which is in Location 6 in the structure and explained in Table 9.
You will also need to access alarms, gates, contact inputs, and other logic functions to initiate
actions. These are located in the Gate Input List in Location 7 in the structure and explained in
Table 10.
Appendix F provides a functional overview of the controller. It can be used with Appendix B,
“Configuration Worksheets”, and Appendix C, “Structure Diagrams”, to select the product
capability needed to match your application.
58
4. Configuration
MI 018-885 – August 2018
Table 9. Signal Distribution List
Name
Signal
A
Conditioned Analog Input IN1
B
Conditioned Analog Input IN2
C
Conditioned Analog Input IN3
D
Conditioned Analog Input IN4
E
Conditioned Frequency Input F1
F
Conditioned Frequency Input F2
G
Constant, adjustable
H
Constant, adjustable
I
Constant, adjustable
J
Constant, adjustable
C1 MEAS
Controller 1 Measurement
C1 LOCSP
Controller 1 Local Set Point
C1 REMSP
Controller 1 Remote Set Point
C1 SETP
Controller 1 Active Set Point
C1 OUT
Controller 1 Output
C2 MEAS
Controller 2 Measurement
C2 LOCSP
Controller 2 Local Set Point
C2 REMSP
Controller 2 Remote Set Point
C2 SETP
Controller 2 Active Set Point
C2 OUT
Controller 2 Output
ASEL OUT
Selected Output of Auto Selector
AOUT 1
Analog Output 1
AOUT 2
Analog Output 2
CALC 1
Result of Calculation 1
CALC 2
Result of Calculation 2
CALC 3
Result of Calculation 3
IN1
Analog Input 1
IN2
Analog Input 2
IN3
Analog Input 3
IN4
Analog Input 4
F1
Frequency Input 1
F2
Frequency Input 2
TOTAL 1
Totalizer 1 Accumulated Value (a)
TOTAL 2
Totalizer 2 Accumulated Value (a)
100 PCT
Constant, fixed at 100 percent
0 PCT
Constant, fixed at 0 percent
NONE
No Source
a. Lower two bytes of 3-byte number
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4. Configuration
Table 10. Gate Input List
Name
Source
True State
CI 1
Contact Input 1
Closed
CI 2
Contact Input 2
Closed
ALARM 1
State of Alarm 1
In Alarm
ALARM 2
State of Alarm 2
In Alarm
ALARM 3
State of Alarm 3
In Alarm
ALARM 4
State of Alarm 4
In Alarm
C1 A/M
State of Automatic or Manual,
Controller 1
Automatic
C1 R/L
State of Remote or Local, Controller Remote
1
C2 A/M
State of Automatic or Manual,
Controller 2
C2 R/L
State of Remote or Local, Controller Remote
2
Automatic
W/P
State of Workstation or Panel
Workstation
COMMFAIL
Communications Timeout
Timed Out
C1 EXACT
State of EXACT, Controller 1
Enabled
C2 EXACT
State of EXACT, Controller 2
Enabled
TOTAL 1
State of Totalizer 1
Totalizer reached preset value or
counted down to zero
TOTAL 2
State of Totalizer 2
Totalizer reached preset value or
counted down to zero
AUTOSEL
Auto Select Output State
False = C2 output; True = C1
GATE 0
Output of Gate 0
True
GATE 1
Output of Gate 1
True
GATE 2
Output of Gate 2
True
GATE 3
Output of Gate 3
True
GATE 4
Output of Gate 4
True
GATE 5
Output of Gate 5
True
GATE 6
Output of Gate 6
True
GATE 7
Output of Gate 7
True
GATE 8
Output of Gate 8
True
GATE 9
Output of Gate 9
True
ON
Fixed State Input
Always
OFF
Fixed State Input
Never
NONE
Function Switch Not Used
N/A
NOTE
A switch assignment other than NONE has priority over the W/P, A/M, and R/L keys
and the communication link. For example, if C1 A/M is assigned through Gate 1, the
A/M key or a supervisory host command to change A/M status is ignored.
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4. Configuration
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Implementing Your Configuration
When you have determined the necessary changes for your application, use the keypad on the
front panel to implement the changes.
Figure 31. Keypad
W/P
R/L
A/M
SEL
TAG
ACK
!
CAUTION
POTENTIAL MISCONFIGURATION
Entering the CONFIGuration mode freezes both outputs, ceases all algorithm execution, and
blanks the graphics display. Also, when you return from CONFIG to Normal Operation, the
controller is placed in manual control, local set point (if R/L is configured), and panel (if W/P is
configured). The display will be that of Controller 1 (or FUNCtion 1) with the bargraph
identifier positioned over the output (right) bargraph.
Failure to follow these instructions can result in equipment damage.
Five of the eight keys are used during configuration.
Table 11. Keypad
Key
TAG
Description
Used to go from Normal Operation to READ mode and to return
from any point in READ or SET to Normal Operation.
Used to sequence up and down in the program structure and to
change menu entries (i.e., mode, alarm, status, and limit settings).
ACK
Used to step sequentially through all remaining items in the
structure and to “enter” a changed value or status.
SEL
Used to return display in minor increments back through the
program structure.
To go from Normal Operation to CONFIGuration, use the following procedure. This procedure
assumes that the factory default passcode is configured.
762 MICRO
0.0
Press TAG
MENU
READ
?
Press
MENU
SET
?
Press ACK
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4. Configuration
SET
OPTUNE ?
Press
SET
SECURE ?
Press ACK
PASSCODE
=
Press ACK
(3 TIMES) *
SECURE
ALLTUNE ?
Press
(2 TIMES)
SECURE
CONFIG ?
Press ACK
*For default passcode: (blank)(blank)(blank)
!
CAUTION
POTENTIAL MISCONFIGURATION
Entering the CONFIGuration mode freezes both outputs, ceases all algorithm execution, and
blanks the graphics display. Also, when you return from CONFIG to Normal Operation, the
controller is placed in manual control, local set point (if R/L is configured), and panel (if W/P is
configured). The display will be that of the Controller 1 (or FUNCtion 1) with the bargraph
identifier positioned over the output (right) bargraph.
Failure to follow these instructions can result in equipment damage.
Continue using the ,  ACK, and SEL keys, and go to the category and subdivision of each
parameter to be changed. The Location column of the Configuration Worksheets in Appendix B
and the Structure Diagrams in Appendix C help you get there.
As Figure 32 shows, you move sequentially through the structure with the ACK key and up and
down with the  and  keys. The SEL key enables you to return the display back through the
structure in minor increments. Lastly, you can return to Normal Operation at any time with the
TAG key.
The category is on the upper line of the display and the subdivision on the lower line.
CONFIG
GATES
Pressing the ACK key causes the subdivision to move to the upper line and its value or status to
appear on the lower line.
GATES
GATE 0
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4. Configuration
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Use the  and keys to change the selection, value or status.
After the change is completed, press the ACK key to “enter” the new selection, value or status.
The display then advances to the next item in the structure.
Figure 32. Example Showing Use of Configuration Keys
NORMAL
OPERATION
TAG
TAG
CONFIG
GATES
ACK GATES
GATE 0
TAG
ACK GATE 0
LOGIC
TAG
ACK LOGIC
DIRECT
SEL
SEL
SEL
ACK
SEL
LOGIC
NOT
SEL
SEL
GATE 0
INPUT 1
ACK
TAG
ACK
SEL
SEL
TAG
INPUT 1
NONE
ACK
TAG
INPUT 1
CI 1
ACK
TAG
GATES
GATE 1
= starting point of example
!
CAUTION
POTENTIAL MISCONFIGURATION
A selection, value, or status is not entered into the data base until the ACK key is pressed.
Failure to follow these instructions can result in equipment damage.
In the READ or SET mode, holding down the , , ACK, and SEL key causes the displays to
sequence automatically.
Values of some parameters are entered or changed one character at a time. The first character will
flash; it may be changed by pressing the  or  key. The available characters are listed in Table 12.
Not all parameters use the entire list.
Table 12. List of Characters
Character
Character
9 through 0
<
.(decimal)
/
-(minus)
,(comma)
(blank)
+
A through Z
*
_(underline)
)
\
(
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4. Configuration
Table 12. List of Characters
Character
Character
@
’(apostrophe)
?
(test)
>
 (sq root)
°(degree)
=
After changing the first character, enter it by pressing the ACK key. The next character then
flashes. Repeat this process for each character in succession. Use the SEL key to backspace and
correct a detected error. When the final character is entered, the display changes to the next item
in the structure.
NOTE
Parameters in the CONFIG section of the structure must be configured before those
in the ALLTUNE (or OPTUNE) section.
When the configuration is completed, use the TAG key to return to Normal Operation.
!
CAUTION
EQUIPMENT OPERATION HAZARD
At various points in the Configuration section of this instruction, examples are given. If you
implement an example on your instrument, the results are stored in your configuration module.
Thus, the next user may encounter different entries than are shown in the Standard Factory
Configuration column of Appendix B.
Failure to follow these instructions can result in equipment damage.
Common Configuration Functions
Security
A PASSCODE enables you to help prevent unauthorized personnel from changing the
configuration and those categories of values you choose to protect.
The 762CNA Controller is shipped from the factory with a PASSCODE of three blanks. The
passcode may be changed to three other characters. Any characters from Table 12 can be used.
The configuration parameter to do this is NEWPASS. It is found in Location 5-C2 in the
structure diagrams.
After you enter the characters and press the ACK key, you are asked to enter them a second time
as a verification (VERIFY). If the two entries match, the new passcode replaces the previous
passcode.
Under the configuration parameter SHOWOP (Location 2 in the structure diagrams), you can
allow or help prevent unauthorized personnel from changing the values of those parameters
(TUNE C1, C1 LIMITS, TUNE C2, C2 LIMITS, ALARMS, CONSTS, TOTALS, RD CFG)
that may be adjusted without the use of a PASSCODE (in OPTUNE). ACKnowledge YES for
each parameter group that authorized personnel may adjust in OPTUNE. Note that SHOWOP
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4. Configuration
MI 018-885 – August 2018
categories displayed depend on whether the function is configured. For example, if neither
totalizer is enabled, TOTALS does not appear under SHOWOP.
Control Type and Tuning
For each controller, the standard algorithms are PI/PID, I, P/PD, and EXACT control. The
factory default is PI/PID. If you select a different algorithm, you will need to configure a change.
You can configure each of the two control FUNCtions at Location 5-A1 in the structure
diagrams.
Next determine your values for the algorithm selected. The parameter limits and the default
configuration for Proportional (PF), integral (IF), and derivative (DF) control are as follows:
Table 13. Control Parameter Limits
Parameter
Limits
Default
PF
1 and 8000%
200
IF
0.01 and 200 minutes/repeat
2.0
DF
0 and 100 minutes
0.0
Note that the PI and PID algorithms are grouped together as are the P and PD algorithms. To get
PI or P, set DF to zero. To get PID or PD, set DF to a value.
Set Point Lag (SP LAG), the ratio of lead to lag, can be configured between 0 and 1. Zero (0)
means that no proportional gain is applied to the set point; all proportional gain is applied to the
measurement. One (1) is used for a dominant deadtime process (delay). Typically, 0.2 is used for a
dominant lag process.
Details of EXACT parameters are discussed in Chapter 6, “EXACT Tuning” of this instruction
manual.
BYPASS causes the set point to go directly to output. Make a ON entry to enable bypass for
Controller 1 at TUNE C1 and for Controller 2 at TUNE C2. The factory default is OFF. Both
are at Location 4-A1 in the structure diagrams.
Input Signals
Analog Inputs
The 762CNA has four analog inputs (IN1, IN2, IN3, IN4). These inputs are 4-20 mA dc
(through 250-ohm resistors). They can be changed to 1-5 V dc by removing the 250-ohm input
termination resistors. One can be an RTD input. If you use an RTD input, you must configure it
as IN1 and also have the RTD hardware option. IN1 through IN4 can be specified from the
Signal Distribution List (Location 6 in the structure diagrams).
Frequency Inputs
The frequency/pulse inputs can be two 1 to 9999 Hz inputs or a pair of Pulse Up/Pulse Down
inputs. Frequency rates below 1 Hz are cut off and ignored, producing the same results as inputs
of 0 Hz. When configured as pulse inputs, F1 is the pulse up input and F2 is the pulse down
input. The instantaneous difference between the pulse up and pulse down input is F2; the
integrated difference is F1. F1 and F2 can be specified from the Signal Distribution List.
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4. Configuration
In a pulse set point application (which emulates 62HM controllers), the following configuration
entries must be made:
1. Select PULSED at FREQ I/P (Location 5-B2 in the structure diagrams).
2. Configure the SET PT TYPE as R/L (Location 5-G1).
3. Configure LOCTRK as ON (Location 5-H1).
4. Configure SOURCE as CALC n (Location 5-H1).
5. Configure CALC n as L+F (Location 5-C1). Signal F is the scaled and conditioned
version of F2.
All analog or frequency input signals can be conditioned and scaled, characterized, or combined
in a variety of calculations. These operations are discussed later in this chapter.
Discrete Inputs
The controller also has two discrete (non-isolated contact or transistor switch) inputs, CI1 and
CI2. You can use them, for example, to actuate remote status changes of auto/manual (A/M),
remote/local (R/L), workstation/panel (W/P), EXTernal ACKnowledge, tracking functions
(MEASTRK and OUTTRK), and totalizer functions (HOLD and RESET). CI1 and CI2 are
specified from the Gate Input List.
Input Signal Conditioning and Scaling
Each of the analog and frequency inputs discussed above can be passed through a Butterworth
FILTER adjusted for 0 to 10 minutes, then FORMATted as LINEAR, SQUARED, SQuare
ROOTed, or CHARacterized over one of two selectable series of points. Lastly, an INBIAS may
be applied before a GAIN and an OUTBIAS after the GAIN. The equation is:
  FORMATted Input + INBIAS   GAIN  + OUTBIAS = Conditioned Input
See Figure 33 for a diagram representing the signal conditioning and scaling process.
The order of these functions is reversed during configuration (i.e., OUTBIAS, GAIN, INBIAS,
FORMAT, and FILTER) at Location 5-B2 of the structure diagrams.
Analog inputs IN1, IN2, IN3, and IN4 become signals A, B, C, and D after signal conditioning
and scaling. Likewise, frequency inputs F1 and F2 become E and F.
Four constants may be used, identified as G, H, I, and J. These may be adjusted through
OPTUNE (if allowed) and ALLTUNE at Location 4-B2 of the structure diagrams.
All conditioned inputs (A - F) and the constants (G - J) are available in the Signal Distribution
List (Location 6).
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4. Configuration
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Figure 33. Input Signal Conditioning and Scaling
A Filter
IN 1
Analog Input 1
B Filter
IN 2
Analog Input 2
C Filter
IN 3
Analog Input 3
D Filter
IN 4
Analog Input 4
Freq
Freq Input 1
New Value
+
+
+
F1
E Filter
+
LIN
SQR
SQD
CHAR1
CHAR2
LIN
SQR
SQD
CHAR1
CHAR2
LIN
SQR
SQD
CHAR1
CHAR2
LIN
SQR
SQD
CHAR1
CHAR2
LIN
SQR
SQD
CHAR1
CHAR2
IN
BIAS
+
GAIN
+
x
+
OUT
BIAS
+
+
+
A
Input Scaling
IN
BIAS
+
GAIN
+
x
+
OUT
BIAS
+
+
+
B
Input Scaling
IN
BIAS
+
GAIN
+
x
+
OUT
BIAS
+
+
+
C
Input Scaling
IN
BIAS
+
GAIN
+
x
+
OUT
BIAS
+
+
+
D
Input Scaling
IN
BIAS
+
GAIN
+
x
+
OUT
BIAS
+
+
+
E
Input Scaling
+
-
Freq
Input 2
F2
Pulse
Up/Down
F Filter
LIN
SQR
SQD
CHAR1
CHAR2
IN
BIAS
+
GAIN
+
x
+
OUT
BIAS
+
+
+
F
Input Scaling
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4. Configuration
Output Signals
The 762CNA has two analog output signals. AOUT1 is a 4 to 20 mA signal into 500 ohms
maximum. AOUT2 can be a 4 to 20 mA or 1 to 5 V dc, jumper selectable signal. You can
configure either at Location 5-C2 in the structure diagrams to output a signal from the Signal
Distribution List. Note, however, that certain configurations automatically assign the source of
AOUT 1 and AOUT 2.
The controller also has two discrete (non-isolated open collector transistor switch) outputs, CO1
and CO2. You can use them for status indication of A/M, R/L, W/P, and alarms. You can also
configure them as the destination for any two of the Boolean gate outputs. Configuration is done
at Location 5-C2 in the structure diagrams to output a signal from the Gate Input List.
Display Features
TAG
The top line of the alphanumeric display can read a looptag of your choosing during normal
operation mode. You can configure the TAGs for both the first and second controller to be up to
a nine character ASCII text string. Enter the configuration at TAG in Location 5-E1 of the
structure diagrams. Enter the TAG one character at a time as explained in ““Implementing Your
Configuration””.
Display Variable (in place of Looptag)
If an engineering variable is desired in place of a looptag, it may be configured at TOP LINE
VARIABLE at Location 5-E1 in the structure diagrams. Enter its TYPE (LINEAR or TEMP),
ENG UNiTS, range (URV and LRV), and SOURCE (from the Signal Distribution List). Thus,
this function provides a simple indication of any assigned SOURCE variable.
Measurement, Set Point Display (MEAS, SP)
In normal operation mode, the engineering scaled value of the measurement or set point, as
identified by the Bargraph Identifier, is located on the second line of the alphanumeric display.
Configure this display at MEAS, SP in Location 5-E2 by specifying its TYPE (LINEAR or
TEMPerature), ENG UNiTS, and range (URV or LRV). If you select TEMPerature, specify the
SCALE as IEC 100 or SAMA 100 for an RTD input or T/C J, T/C K, or T/C E for a
thermocouple input from a temperature transmitter. Also, specify the ENG UNiTS as DEG F or
DEG C.
Auto/Manual Control (A/M)
The controller can be placed in either an automatic (A) or manual (M) mode. This can be
changed by the A/M key on the front of the controller if the controller is in panel mode (P) and if
the function switch (A/M) is configured to NONE. A switch assignment other than NONE has
priority over the A/M key. Auto or Manual control may be specified at Location 5-G2 under the
following conditions:
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4. Configuration
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STARTUP:
A/M state upon application of power or restart after a power failure.
FLUNK:
A/M state upon loss of serial communications (when in Workstation mode)
between controller and host computer. Besides a choice of Auto or Manual,
the configurator may also select the last status (LAST A/M) of control before
serial communications was lost.
SWITCH:
An entry from the Gate Input List here drives the specified SWITCH to
change the controller operation from Auto to Manual or vice versa. A
configuration of ON or to an entry from the Gate Input List whose logic is in
the True state sets the control to the AUTO mode. Conversely, OFF or
(False) sets the control to the MANUAL mode.
A switch assignment other than NONE has priority over the A/M key or the
communication link; e.g., if A/M were assigned through Gate 1, then the A/M
key or a supervisory host command to change A/M status would be ignored.
Alarms
Critical process signals are often monitored by process alarms that alert operating personnel to
out-of-range or abnormal conditions. Occasionally, these alarms are used in a non-alert mode for
interlocking logic.
This section describes the kinds of alarms available in the controller, how they operate, and how
to enable them. Examples illustrate various situations in which alarms are used.
General Information
The Controller has four alarms. Each alarm can activate on any one of the signals from the Signal
Distribution List. Each alarm has two alarm levels and a deadband whose values can be set. Each
also has one Boolean output. You can also configure each alarm to have a specific Form, Type, and
Action as follows:
Table 14. Alarm Configurations
Form:
Absolute, Deviation, or Rate of Change
Type:
High/Low, High/High, or Low/Low
Action:
Latching, Nonlatching, or Permissive
For deviation alarms, both the reference and alarmed variables are selected from the Signal
Distribution List.
Measurement and output alarm conditions of Controller 1 and/or Controller 2 can be viewed on
the alphanumeric and bargraph displays on the faceplate of the controller. The Output and
Measurement bargraphs can each display one of the four alarms. The alarm must, however, be an
absolute or deviation alarm, not a permissive alarm. Alarms can also be displayed on a 3-bar
indicator display. The alarm is only displayed on the bargraph display of an alarmed variable.
Lastly, in addition to acknowledging alarms with the ACK key, you can configure alarms to be
EXTernally ACKnowledged by one of parameters from the Gate Input List. The ACK key is
active even if EXT ACK is used.
The basic configuration of alarms is done in the CONFIGuration section (Location 2-A2) in the
structure diagrams as just described. However, the alarm level and deadband values are adjusted in
the ALLTUNE (OPTUNE) section (Location 4-A2); the display selections are added in the
DISPLAY section (Location 5-E2, 8-A2, or 9-A2).
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4. Configuration
Forms of Alarms
There are three forms of alarms:
 Absolute (ABS)
 Deviation (DEV)
 Rate of Change (ROC)
Absolute Alarms
An ABSolute alarm measures a variable relative to the zero process condition; e.g., temperature
measurement or level in a vessel. An ABSolute alarm has one input variable. This input is the
monitored value that is compared with the configured alarm levels. When the attached monitored
value exceeds the alarm level, an alarm condition occurs and the Boolean output associated with
that alarm is set to True. In the case of Hi/Hi and Lo/Lo alarms (see “Types of Alarms” on
page 70), the second alarm level (Level 1 for Hi/Hi, Level 2 for Lo/Lo) trips the Boolean output.
Assign the input variable from the Signal Distribution List using the parameter ATTACH at
Location 5-B2 in the structure diagrams.
Deviation Alarms
A DEViation alarm monitors a process variable in relation to a reference variable. For example,
you can use this form to determine how the measurement is performing in relation to the set
point, or how “Flow 1” is performing in relation to “Flow 2”. A DEViation alarm has one input
that is the monitored variable and one that is the reference variable. When the difference between
the two variables exceeds the configured alarm level, an alarm condition occurs and the Boolean
output associated with that alarm is set to True.
Select both monitored and reference variables from the Signal Distribution List. Assign the
monitored variable using the parameter ATTACH and the reference variable using the parameter
REF at Location 5-B2 in the structure diagrams.
Rate of Change Alarm
Use a Rate-of-Change alarm when the change of a variable in an increment of time is important;
i.e., the change in temperature per change in unit time in a reactor. Because of its infrequent use
and greater complexity, the rate of change alarm is discussed in detail later in the “Additional
Configuration Functions” section.
Types of Alarms
There are three types of alarms:
 High/Low (HI/LO)
 Low/Low (LO/LO)
 High/High (HI/HI)
Each alarm type uses a deadband (DB), a user adjustable parameter that helps prevent
intermittent alarming when the monitored value hovers around the alarm levels.
Examples of all alarm types are given on the following pages.
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4. Configuration
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HIgh/LOw Alarms
Figure 34 and Figure 35 show High/Low alarms when used with Absolute and Deviation forms of
alarm respectively.
Table 15. High/Low alarms
Alarm State
When Monitored Signal Is
Enters High Alarm
Greater than the HI alarm level
Exits High Alarm
Less than the HI alarm level minus the deadband
Enters Low Alarm
Less than the LO alarm level
Exits Low Alarm
Greater than the LO alarm level plus the deadband
Figure 34. High/Low Absolute Alarm
% OR
Units
Alarm
Condition
HI
Level 1 Limit
Monitored Variable
Deadband
Deadband
LO
Level 2 Limit
Alarm
Condition
Time
Figure 35. High/Low Deviation Alarm
% or
Units
Alarm
Monitored
Condition
Variable
+Dev.
HI
Deadband
Level 1 Limit
Ref. Variable
LO
Level 2 Limit
-Dev.
Deadband
Alarm
Condition
TIME
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4. Configuration
HIgh/HIgh Alarms
Table 16. High/High Alarms
Alarm State
When Monitored Signal Is
Enters Warning
Greater than the Lower alarm level
Exits Warning
Less than the Lower alarm level minus the deadband
Enters High Alarm
Greater than the Higher alarm level
Exits High Alarm
Less than the Higher alarm level minus the deadband
Figure 36 and Figure 37 show High/High alarms when used with Absolute and Deviation forms
of alarm respectively. Note that in the warning state, the alarm activates the alarm indicator on the
front panel but not the Boolean alarm output. The alarm condition activates this output.
Figure 36. High/High Absolute Alarm
% or
Units
Deadband
Level 1 Limit
HI/HI
Monitored
Variable
Level 2 Limit
HI
Alarm
Condition
Deadband
Warning
Time
Figure 37. High/High Deviation Alarm
Warning
% or
Units
Alarm
HI/HI
Level 1
Limit
Level 2
Limit
HI
Condition
Deadband
Monitored
Variable
Deadband
+Dev.
Ref. Variable
-Dev.
Time
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4. Configuration
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LOw/LOw Alarms
Table 17. Low/Low Alarms
Alarm State
When Monitored Signal Is
Enters Warning
Less than the Higher alarm level
Exits Warning
Greater than the Higher alarm level plus the deadband
Enters Low Alarm
Less than the Lower alarm level
Exits Low Alarm
Greater than the Lower alarm level plus the deadband
Figure 38 and Figure 39 show Low/Low alarms when used with Absolute and Deviation forms of
alarm respectively. Note that similar warning and alarm condition states occur as in the
High/High alarm type.
Figure 38. Low/Low Absolute Alarm
% or
Units
Warning
Alarm
Deadband
Condition
LO
Level 1
Limit
Deadband
Monitored
Variable
LO/LO
Level 2 Limit
Time
Figure 39. Low/Low Deviation Alarm
% or
Units
Monitored Variable
Warning
+Dev.
Ref. Variable
Deadband
-Dev.
LO
Level 1 Limit
Deadband
LO/LO
Level 2 Limit
Alarm
Condition
Time
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4. Configuration
Alarm Action
There are three kinds of alarm action:
 Latching (LAT)
 Nonlatching (NON LAT)
 Permissive (PERMISVE)
A LATching action requires that the user always acknowledge an alarm state either during or after
the time that the alarm condition exists.
A NONLATching action provides notification during transient alarm conditions, but is self
clearing once these conditions no longer exist.
A PERMISsiVE action is used to monitor signals to generate logic-only action. This action
requires no operator interaction.
A summary of alarm action characteristics is given in Table 18.
Table 18. Alarm Actions
Alarm Action Characteristics
Latching
Nonlatching
Permissive
Both warning and alarm state
require acknowledgment
Yes
Allowed, not
required
No; Cannot be
acknowledged
Exiting warning or alarm state
cancels requirement to acknowledge
alarm
No
Yes
N/A
Alarm indicator flashes when
acknowledgment required
Yes
Yes
Never; no display
Alarm indicator ON continuous in
warning or alarm state following
acknowledgment
Yes
Yes
Never; no display
Boolean output is TRUE in
alarm state
Yes
Yes, only until
Yes
the alarm state
is ACKed
Boolean output is TRUE in
warning state
No
No
No
Configuring, Tuning, and Displaying Alarms
Configuring the form, type, and action of each of your alarms as well as attaching the selected
input variable and reference variable (in the case of a Deviation alarm) is done in CONFIG at
Location 5-A2 in the structure diagrams.
Tuning the alarm levels and the deadband values is done in ALLTUNE (or OPTUNE) at
Location 4-A2 in the structure diagrams. Level 1 is assumed to be the higher of the two alarm
levels; i.e., Level 1 is HI in a HIgh/LOw alarm, HI/HI in a HIgh/HIgh alarm, and LO in a
LOw/LOw alarm. Level 2 is LO in a HIgh/LOw alarm, HI in a HIgh/HIgh alarm, and LO/LO
in a LOw/LOw alarm.
Configuring measurement or output alarm conditions to display on the faceplate is done in
DISPLAY at Location 5-E2 or 9-A2 in the structure diagrams.
74
4. Configuration
MI 018-885 – August 2018
NOTE
If more than one alarm is configured for measurement or for output, only the first
(lowest numbered) alarm will be displayed. Rate of change alarms cannot be
displayed.
Configuring alarms to display on a 3 bar indicator is done at Location 8-B2 in the structure
diagrams. An alarm is only displayed on the bargraph display of an alarmed variable. For an alarm
to be displayed on the bargraph of a 3-bar indicator, the bar must be sourced to the same
parameter that the alarm is attached and the alarm display must be turned on.
Alarm Configuration Examples
Example 1
An application requires a High/Low absolute alarm on the measurement to Controller 1. The
alarm levels are to be 10 and 90% and have a dead band of 2%. The alarm output, when active,
should close a contact output for as long as the alarm condition persists or until the alarm is
acknowledged (nonlatching action). Finally, the alarm levels must be indicated on the
measurement bargraph display.
NOTE
The parameters in CONFIG must be configured before those in ALLTUNE.
1. Access CONFIG ALARMS (Location 5-A2) and go to ALARM 1.
2. Select HI/LO from the menu for TYPE.
3. Select NON LAT from the menu for ACTION.
4. Select ABS from the menu for FORM.
5. Connect this alarm to the Controller 1 Measurement by selecting C1 MEAS from the
menu for ATTACH.
6. Go to EXT ACK (Location 5-B2) and select NONE from the menu.
7. Access CONFIG OUTPUTS (Location 5-C2) and select ALARM 1 from the menu
for CO 1. This connects the alarm to a contact output.
8. Access FUNC 1 DISPLAY (Location 5-E1) and go to DISPLAY ALARMS (Location
5-E2).
9. Select MEAS ALM from the menu and then select YES.
NOTE
To assign the alarm levels you must now exit the CONFIGuration Mode and enter
the ALLTUNE mode.
10. Access ALLTUNE ALARMS (Location 4-A2) and go to ALARM 1.
11. Select a value of 90 for LEVEL 1 (For any alarm TYPE, LEVEL 1 is always the
numerically greater value.)
12. Select a value of 10 for LEVEL 2.
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4. Configuration
13. Select a value of 2 for DB (dead band). The configuration of this example is now
complete.
This may be shown through a pictorial representation:
Figure 40. Alarm Configuration - Example 1
C1 MEAS
C1 PID
ATTACH
ALARM 1 OUTPUT
(HI/LO)
(NONLAT)
(ABS)
Level 1 = 90%
Level 2 = 10%
DB = 2%
CO 1
Bargraph Display
Example 2
A High/Low, nonlatching, deviation alarm is required on the measurement of a remote/local set
point controller. The alarm is to be activated when the measurement deviates from the remote set
point by some level (C1 MEAS - C1 REMSP).
[The intent of this example is to demonstrate the configuration of a deviation alarm. The other
attributes of this alarm (Output, Display requirements, Levels, and Dead Band), if given, would
be configured as in Example 1, Steps 7 - 13.]
1. Access CONFIG ALARMS (Location 5-A2) and go to ALARM 1.
2. Select HI/LO from the menu for TYPE.
3. Select NON LAT from the menu for ACTION.
4. Select DEV from the menu for FORM.
A Deviation alarm has two inputs: the alarmed variable (the measurement in this example)
and a REFerence variable.
5. Select C1 REMSP from the menu for REF.
6. Select C1 MEAS from the menu for ATTACH.
7. Configure Output, Display, Levels, and Dead Band requirements to complete this
example.
Figure 41. Alarm Configuration - Example 2
R
C1 REMSP
Set point
L
C1 MEAS
REF
C1 PID
ATTACH
76
ALARM 1
(HI/LO)
(NONLAT)
(DEV)
4. Configuration
MI 018-885 – August 2018
Example 3
The output state of a deviation alarm determines whether the EXACT state is ON or OFF and
whether Contact Output 2 is open or closed.
NOTE
For this example assume that ALARM 1 is the alarm in question and that its
configuration has been completed. Further assume that Controller 1 has been
configured to the point of selecting the TYPE of control.
1. Access CONFIG FUNC 1 (Location 5-A1) and select EXACT.
2. At EXACT SW in Location 5-G3, select ALARM 1 from the menu. This selection
means that EXACT is activated (turned ON) when ALARM 1 is in the alarm state.
3. Access CONFIG OUTPUTS (Location 5-C2) and select CO 2.
4. Select ALARM 1 from the menu for CO 2. This selection means that Contact Output
2 is closed when ALARM 1 is in the alarm state. The configuration of this example is
now complete.
Example 4
A permissive alarm, connected to scaled variable C, is used to activate a logic gate whose output is
used as a Boolean operator in a calculation. The use of such an operator as a switch is discussed in
“Example 3: Signal Switching”.
1. Access CONFIG ALARMS (Location 5-A2) and go to ALARM 1.
2. Select HI/HI for Type, PERMISIVE for Action, and ABS for Form.
3. Select C from the menu for ATTACH.
4. Access CONFIG GATES (Location 5-A3), go to GATE 0 (GATE 0 is DIRECT), and
select ALARM 1 from the menu for INPUT 1.
5. Access ALLTUNE ALARMS (Location 4-A2) and assign values for LEVEL 1, LEVEL
2, and DB for ALARM 1.
NOTE
Since the Warning state of a permissive alarm does not trigger alarm logic, the two
levels are usually set to the same value.
6. Access CONFIG CALC and go to CALC 1. If G is to be a constant used if Gate 0 is
in the true state and H if in the False state, configure CALC 1 = G0H.
This may be shown through a pictorial representation:
Figure 42. Alarm Configuration - Example 4
True
Variable C
ATTACH
ALARM 1 INPUT 1
(HI/HI)
GATE 0
(PER)
(ABS)
False
G
CALC 1
H
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4. Configuration
Example 5
A Deviation alarm is required to monitor the difference between the measurement and the set
point of a process. This alarm is to be displayed on the controller. A second alarm is also required
for monitoring the level of a tank.
1. Access CONFIG ALARMS (Location 5-A2) and go to ALARM 1.
2. Select HI/LO for TYPE, NONLAT for ACTION, and DEV for FORM.
3. Connect this alarm to Controller 1 Measurement by selecting C1 MEAS from the
menu for ATTACH. Select C1 SETP for REF.
4. Go to ALARM 2 and select HI/LO for TYPE, PERMISIVE for ACTION, and ABS
for FORM.
5. ATTACH this alarm to IN 4 scaled and conditioned variable D to which the level
transmitter is connected.
6. Access CONFIG OUTPUTS (Location 5-C2) and select ALARM 1 from the menu
for CO 1 and ALARM 2 for CO 2.
7. Access FUNC 1 DISPLAY (Location 5-E1) and go to DISPLAY ALARMS (Location
5-E2. Select MEAS ALARMS from the menu and then select YES.
8. Access ALLTUNE ALARMS (Location 4-A2) and go to ALARM 1. Select the desired
values for LEVEL 1, LEVEL 2 and DB.
9. Go to ALARM 2 and select the desired values of LEVEL 1, LEVEL 2 and DB for
ALARM 2.
This may be shown through a pictorial representation:
Figure 43. Alarm Configuration - Example 5
C1 SETP
C1 MEAS
D
78
REF
ATTACH
ATTACH
ALARM 1
(HI/LO)
(NONLAT)
(DEV)
ALARM 2
(HI/LO)
(PERMISVE)
(ABS)
CO 1
CO 2
4. Configuration
MI 018-885 – August 2018
Alternate Station Configurations
Dual Controller
You can use the 762CNA as two controllers with independent control strategies. All control
functions (P, I, PI, PD, PID, and EXACT) are available to each loop. Specify the STRATEGY as
TWO FUNC at Location 5-B1 in the structure diagrams. Then configure the first loop in
CONFIG FUNC 1 and the second loop at CONFIG FUNC 2, both at Location 5-A1 in the
structure diagrams.
Cascade Controller
You can also configure the 762CNA to operate as a cascade controller. As such, the output of
Controller 1 (primary controller) is used as the set point or ratio input of Controller 2 (secondary
controller). The configuration allows bumpless transfers between auto/manual modes and
between remote/local set point modes. To configure the 762CNA as a cascade controller, specify
the STRATEGY as CASCADE at Location 5-B1 in the structure diagrams. Then configure the
primary controller at FUNC 1 and the secondary controller at FUNC 2, both at Location 5-A1
in the structure diagrams.
Example
A single station cascade controller is required as shown in Figure 44. As steam is drawn from the
header, the pressure drops, reducing the flow to the heat exchanger and causing fluctuations in
heated liquid temperature. By measuring the steam flow, the secondary controller can quickly
adjust the steam flow to compensate for pressure fluctuations, thus minimizing the temperature
variation seen in the heated fluid.
Figure 44. Single Cascade Controller Example
Steam Header
Cold Liquid
Heat Exchanger
FT
C2 MEAS
RTD
FIC
Heated Liquid
C2 REMSP
C1 OUT
TIC
C1 MEAS
INT FBK
The primary is a temperature controller (RTD Option is used) and the secondary is a flow
controller. The integral feedback (INT FBK) to the primary is the measurement of the secondary.
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4. Configuration
For this example, start with configuration of STRATEGY to CASCADE. Next, configure the
primary, then the secondary, and finally the inputs.
1. Access CONFIG STRATEGY (Location 5-A1) and select CASCADE from the
menu.
2. Access CONFIG FUNC 1 and go to DISPLAY (Location 5-E1).
3. At this point you would configure MEAS, SP TYPE as TEMP, and then the SCALE,
ENG UNiTS, and range (URV and LRV), if given, in the example at Location 5-E2
and 5-E3.
4. Access CONFIG FUNC 1 and go to MEAS (Location 5-G2). Select LINEAR from
the menu for FORMAT.
5. Select A from the menu for SOURCE. INPUT 1 must be used for an RTD and A is
INPUT 1 after signal conditioning.
6. Access CONFIG FUNC 2 and go to DISPLAY (Location 5-E1).
7. At MEAS, SP (Location 5-E2), go to TYPE and select LINEAR.
8. Access CONFIG FUNC 2 and go to MEAS (Location 5-G2). Select B from the menu
for SOURCE (Flow Measurement).
9. Access CONFIG INPUTS and go to INPUTS A (Location 5-B2).
10. Go to FORMAT and select LINEAR from the menu.
11. Go to INPUTS B and repeat Step 10.
This completes the configuration of the requirements given for this example.
Auto Selector Controller
You can also configure your instrument to operate as a two-controller auto selector station, as
shown in Figure 45. In auto selector mode, a single valve is controlled by more than one
controller. Typical applications are processes such as shown in the diagram in which a vessel is
normally controlled to maintain a certain temperature, but at other times must be controlled to
maintain pressure.
As long as pressure is within an acceptable range, temperature is controlled. If pressure rises above
a specified value, steam flow must be decreased to keep the pressure within range. As pressure rises
and falls, control is required to transfer smoothly from temperature to pressure and vice versa.
Because the outputs of two controllers are tied together and control shifts from one to the other,
feedback is provided to help prevent wind-up in the controller that is not currently active. If this
were not provided, control might overshoot wildly whenever control is transferred from one
controller to the other.
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4. Configuration
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Figure 45. Typical Auto Selector Control Application
Controller
PIC
TIC
PRESSURE
VESSEL
STEAM
To configure the 762CNA as an auto selector controller, specify the STRATEGY as AUTO SEL
at Location 5-B1 in the structure diagrams. Next, specify TYPE to be HI SELECT, LO SELECT,
or GATE 4. For HI SELECT, the higher output (C1 OUT or C2 OUT) is selected; for LO
SELECT, the lower output is selected. When GATE 4 is TRUE, C1 OUT is selected; when
FALSE, C2 OUT is selected. If configured as HI SELECT or LO SELECT, specify if the TRK
MAN feature is to be used. TRK MAN connects the OUT TRK switches and signals so that
placing one controller in MANUAL, puts the other controller into track. Then configure the first
controller as FUNC 1 and the second controller as FUNC 2, both at Location 5-A1 in the
structure diagrams.
Auto/Manual Station
You may also configure the 762CNA as one or two auto/manual transfer stations. If a controller
or indicator is configured, only one auto/manual station is available. Configuring your
instrument as an auto/manual station will enable you to manually select either an incoming signal
or a manually-adjusted signal and send the results to a valve or other receiver. This allows you to
interrupt a signal that is sourced from another device and manually take control of it. In addition,
all of the supporting functions available in the controller (e.g., calculation blocks) are available in
the auto/manual station.
To configure the 762CNA as an auto/ manual station, specify the STRATEGY as ONE FUNC or
TWO FUNC at Location 5-A1 in the structure diagrams. Then configure FUNC 1, FUNC 2, or
both as A/M STN at Location 5-B1 in the structure diagrams. From there go to Location 9 to
configure the details of your auto/manual station. Configure the set point display type to NONE
to help eliminate the normal controller set point function and bargraph.
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4. Configuration
NOTE
Check the BIAS under OPTUNE or ALLTUNE, as it affects the output when in
AUTO mode. For proper operation as an A/M Station, the BIAS should be set to
zero.
Indicator Station
You can also use the 762CNA as one or two 3-variable indicators. Each variable has its own
bargraph, digital engineering units, and loop tag. If a controller or auto manual station is
configured, only one 3-variable indicator is available. To configure the 762CNA as a 3-variable
indicator:
1. Specify the STRATEGY as ONE FUNC or TWO FUNC at Location 5-B1 in the
structure diagrams.
2. Configure FUNC 1, FUNC 2, or both as 3 BAR IND at Location 5-B1 in the
structure diagrams.
3. Go to Location 8 to configure the details of each of the bargraphs of your 3-variable
indicator.
4. Specify a 9-character loopTAG. If a blank TAG line is desired, then blank entries must
be made.
5. Specify the TYPE of indication (LINEAR or TEMP), ENG UNiTS and range (URV
and LRV). If you select TEMPerature, specify the SCALE as IEC 100 or SAMA 100
for an RTD input or T/C J, T/C K, or T/C E for a temperature transmitter
thermocouple input. Specify the ENG UNiTS as DEG F or DEG C.
6. Specify the SOURCE of the variable indicated from the Signal Distribution List. A
SOURCE selection of NONE blanks the respective bargraph and its digital display.
7. Specify for each variable, whether or not alarms should be displayed at Location 8-B2.
For an alarm to appear on a given bargraph, there must be an alarm ATTACHED to
the SOURCE of that bargraph. Alarms are configured at Location 5-A2.
Additional Configuration Functions
Logic Gates
There are five single input gates and five dual input gates. See Table 19. Each gate is configured by
selecting the LOGIC and then selecting the source of the INPUT from the Gate Input List. Gates
0 through 4 are the single input gates and each one is configured DIRECT or NOT. Gates 5
through 9 are the dual input gates and each one is configured OR, NOR, AND, NAND, XOR,
or XNOR. The configuration is done at Location 5-A3 in the structure diagrams.
Table 19. Configuring Logic Gates
Gate
0-4
82
Logic
DIRECT
Input 1
True
False
Input 2
N/A
Output
True
False
4. Configuration
MI 018-885 – August 2018
Table 19. Configuring Logic Gates (Continued)
Gate
Logic
Input 1
Input 2
Output
0-4
NOT
True
False
N/A
False
True
5-9
OR
True
True
False
False
True
False
True
False
True
True
True
False
5-9
NOR
True
True
False
False
True
False
True
False
False
False
False
True
5-9
AND
True
True
False
False
True
False
True
False
True
False
False
False
5-9
NAND
True
True
False
False
True
False
True
False
False
True
True
True
5-9
XOR
True
True
False
False
True
False
True
False
False
True
True
False
5-9
XNOR
True
True
False
False
True
False
True
False
True
False
False
True
When gate states are read on the display (Location 1-C3), True status is represented by the term
“closed” and false status by the term “open”.
Gates are cascadeable. They are evaluated in ascending order once each 100 milliseconds. They
are intended primarily for combinational rather than sequential logic. See “Example 3: Signal
Switching” and “Example 4: Using Gates Together”, in the Calculation Examples section.
Calculations
The output of the CALCulation blocks can be derived from a calculation involving a number of
inputs. These inputs may be direct inputs to the controller, conditioned and scaled inputs,
constants, or the output of another CALCulation block.
The characters available for use in the equations are listed in Table 20.
Table 20. Characters for Use in Calculations
Character
Description
Character
Description
A
Analog Input A
X
Output of Calculation CALC 1
B
Analog Input B
Y
Output of Calculation CALC 2
C
Analog Input C
Z
Output of Calculation CALC 3
D
Analog Input D
@
AOUT 1 Output
E
Frequency Input E
(
Open Bracket
F
Frequency Input F

Square Root Brackets
G
Constant G
)
Closed Bracket
H
Constant H
*
Multiplication Operator
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4. Configuration
Table 20. Characters for Use in Calculations (Continued)
Character
Description
Character
Description
I
Constant I
/
Division Operator
J
Constant J
-
Subtraction Operator
K
C2 Local Set Point
+
Addition Operator
L
C1 Local Set Point
>
Greater than (high select)
M
C1 Measurement
<
Less than (low select)
N
C2 Measurement
0
Output of Gate 0
O
C1 Output
1
Output of Gate 1
P
C2 Output
2
Output of Gate 2
Q
C2 Remote Set Point
3
Output of Gate 3
R
C1 Remote Set point
4
Output of Gate 4
S
C1 Active Set point
5
Output of Gate 5
T
C2 Active Set point
6
Output of Gate 6
U
AOUT 2 Output
7
Output of Gate 7
V
TOTAL 1 (a)
8
Output of Gate 8
W
TOTAL 2 (a)
9
Output of Gate 9
(blank)
Terminates the Equation
a. Lower two bytes of 3-byte number
Each equation may have as many as nine characters. Each character is selected using the up and
down arrow keys. In each position in the equation, only those characters that may be entered are
available in the selection list. For example, a variable cannot follow a variable and is not offered for
selection at that point. The selected character is entered using the ACK key. The cursor then
moves one position to the right.
The usual rules of mathematics apply. However, there are a few additional rules.
1. To save space, if there is an open bracket with no associated closed bracket, there is an
implied closed bracket to the right of the rightmost character. Similarly, if there is a
closed bracket with no associated open bracket, there is an implied open bracket to
the left of the leftmost character. For example, (A/B)*(D+H) has 11 characters and
thus exceeds the limit of nine. This can be made acceptable by rewriting the equation
as A/B)*(D+H.
2. A square root is treated like an open bracket during evaluation except that the square
root is taken after evaluating the contents of the bracket. For example, in the
expression A *  B + C), B is added to C, then the square root of the sum is taken
and multiplied times A.
3. The left argument of a gate is selected in the True state and the right argument in the
False state. For example, in the equation CALC 1 = A0B, CALC 1 = A if the output of
Gate 0 is True but CALC 1 = B if the output of Gate 0 is False. Thus gates can
perform switch functions.
4. The order of evaluation is:
Contents of a bracket pair
All gates (switches) left to right
All selectors left to right
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4. Configuration
MI 018-885 – August 2018
All multiplications and divisions left to right
All additions and subtractions left to right
The SEL key will move the cursor one position to the left. If the SEL key is pressed when the
cursor is in the leftmost position, the equation entry is aborted. If in going back to make a
change, the up or down arrow key is used to select a different category from the current
selected character, the characters to the right of the cursor position are blanked.
Several examples are given below to help you understand how to configure this powerful function.
Example 1: Simple Math
A controller is used for pressure-temperature compensated head flow. The equation measurement
= hP/T applies. The head is INput 1; the pressure, INput 2; and the temperature, INput 3.
Because the inputs and output are expressed in percent of range, a scaling factor, G, is required. Its
value is set in ALLTUNE.
To enter this, choose CALC 1 (or CALC 2 or CALC 3) to be the calculation. The scaled INputs
1, 2, and 3 are A, B, and C respectively.
Nine characters can be entered to form an equation. Since the  is treated like an open bracket, all
terms to the right (up to a closed bracket if there is one) are evaluated and then the result is square
rooted. Therefore, the equation is CALC 1 = A*B*G/C and the calculation entry is A*B*G/C
at Location 5-C1 in the structure diagrams. Only eight of the available nine character spaces were
required.
Later in the configuration, CALC 1 is assigned as the SOURCE of the Controller 1 measurement
(FUNC 1 MEAS) at location 5-G2 in the structure diagrams.
Example 2: Signal Selecting
An application requires selection of the measurement based on the highest of three temperature
transmitter inputs. INputs 1, 2, and 3 are utilized.
The scaled INputs 1, 2, and 3 are A, B, and C respectively. CALC 1 is chosen to be the calculation
variable. The equation is CALC 1 = A>B>C and the calculation entry is A>B>C at Location 5-C1
in the structure diagrams. The result of CALC 1 will be the highest value of A or B or C. Later in
the configuration, CALC 1 is assigned as the SOURCE of the Controller 1 measurement (FUNC
1 MEAS) at location 5-G2 in the structure diagrams. This completes the application requirement.
It is shown pictorially as:
Figure 46. Signal Selecting
IN 1
Scaling
A
IN 2
Scaling
B
IN 3
Scaling
C
CALC 1
SOURCE
C1 MEAS
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4. Configuration
Example 3: Signal Switching
Depending on the state of an external contact, either one of two set points are required by the
controller.
Gates 0 through 9 behave like switches when used as operators in a calculation. If the gate output
is true, the variable or expression to the left of the gate is used. If the gate output is false, the
variable or expression to the right is used.
CALC 1 is chosen to be the calculation variable. Constants G and H are used to store the two set
points. The equation is CALC 1 = G0H and the calculation entry is G0H, where 0 is the output
of Gate 0. The calculation entry is made at Location 5-C1 in the structure diagrams.
The input of Gate 0 is assigned to a contact input to cause its state to change. If the controller is
configured for remote/local (R/L) set point operation and CALC 1 is assigned as the source of the
remote set point, either the value of G or H will become the set point depending on the state of
Gate 0. This is shown pictorially below:
Figure 47. Signal Switching
True
CI 1
L
G
INPUT 1
GATE 0
False
SOURCE
CALC 1
SET POINT
C1 PID
R
H
NOTE
See Alarm Configuration “Example 4” on page 77 to see how a Permissive alarm can
trigger a switch.
Example 4: Using Gates Together
Following up on the previous example, two or more gates may be used together. If we want the
result of CALC 1 to be A if Gate 1 is in the true state and B if Gate 1 is in the false state, the
equation is CALC 1 = A1B. If we want the results of that equation to be further modified to be C
if Gate 2 is in the false state, the equation becomes CALC 1 = (A1B)2C and the calculation entry
is (A1B)2C. This expression could be simplified as A1B)2C with the same results. This is shown
pictorially as:
Figure 48. Using Gates Together
True
A
GATE 1
False
CALC 1
B
GATE 2
False
86
C
4. Configuration
MI 018-885 – August 2018
It may also be expressed as:
GATE 1
GATE 2
CALC 1
True
True
A
False
True
B
True
False
C
False
False
C
Example 5: Ramping Set Point
A ramp can be generated by taking advantage of the calculation function’s capability to reuse a
calculation within the same expression.
CALC1 = CALC1 + G will create a ramp since the value of CALC1 is incremented by the
constant G in each computation cycle.
Furthermore, if the calculation is expanded to be CALC1 = (CALC1 + G) < H, the ramp will
continue as long as its value is less than the constant value H and will stop ramping when its value
reaches H.
Symbolically, this appears as X + G ) < ( H in the calculation entry.
If the controller is configured for Remote/ Local (R/L) set point operation and CALC1 is assigned
as the source of the remote set point, then the set point will be the ramping value up to a
maximum value of constant H. This is shown through a pictorial representation as:
Figure 49. Ramping Set Point
+
CALC 1
+
<
R
C1 SETP
G
H
L
Dynamic Compensation
Dynamic Compensation is used often in feedforward control strategies to help optimize the
model response.
The result of CALC 3 can be passed through a dynamic compensator prior to signal distribution.
The dynamic compensator is composed of DEADTIME and LEADLAG functions, each with its
own FOLLOW switch. The DEADTIME precedes the LEADLAG and is the input of the
LEADLAG function. The ratio of lead to lag is controlled by a user specified GAIN factor. The
result may also be subjected to a specified bias. The lag is controlled by specifying lag time (T).
See Figure 50 and Figure 51.
The user can also configure an impulse option. If this option is configured, the GAIN is applied
as usual but the steady state settles out to a zero level (plus BIAS) rather than at the new input
value. If either POSITIVE or NEGATIVE impulse modes are configured, only a positive or
negative shift in the input value is detected and the corresponding output pulse is positive or
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4. Configuration
negative (again returning to the bias baseline at the lag time rate). The configuration for both a
POSITIVE and NEGATIVE impulse option is BIPOLAR. See Figure 50 and Figure 52.
When a process variable (CALC 3) connected to the function varies by some amount (delta), the
block output value will lag, track, or lead the CALC 3 change, depending on whether a gain of 0
(lag), 1 (track), or n>1 is specified.
Figure 50. Dynamic Compensation
Calc 1
Calc 2
*Dync Off
Dync
On
None Off
Impulse
(False)
*
Deadtime
On
(True)
None
Deadtime
Follow
Switch
On (True)
Impulse
Bias
Gain = 0<n<1
First Order Lag
Gain = 1
Track


Gain = n>1
Lead
88

Calc 3
Leadlag
None
Off (False)
* Switch Position
Leadlag
Defined by Configuration
(Impulse)
Follow
Switch
Figure 51. Nonimpulse Mode

Calc 3
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Figure 52. Impulse Mode
Gain = 0
Impulse
Bipolar

Gain = 1

Impulse Positive
Impulse Negative
As shown in Figure 51, lead action is applied in the form of an instantaneous amplification of the
change in CALC 3 value (delta). The increase in the block output value lags, or decays, to a steady
state representing the new level of CALC 3 (plus any user specified BIAS applied to the output of
the function. The time constant required to settle out is configured as LEADLAG TIME by the
user. Lag action is applied by specifying a GAIN of 0, in which case the output change in value
simply lags the CALC 3 step change by the specified LEADLAG TIME. With a GAIN of 1, the
output value follows (tracks) the input (CALC 3) value.
If the optional IMPULSE mode is configured, the GAIN is applied as in the nonIMPULSE
mode, but the steady state settles out to a zero level (plus BIAS) rather than at the new input
(CALC 3) value. If either POSITIVE or NEGATIVE IMPULSE modes are configured, only a
positive or negative shift in the input value will be detected, and the corresponding output pulse
will be positive and negative respectively (again returning to the bias baseline with the LEADLAG
TIME exponential decay). See Figure 52.
The DEADTIME and LEADLAG functions each have their own FOLLOW switches which can
be used to bypass either or both functions when the state of these switches is TRUE. When one of
these functions are employed, and its follow switch is activated, the output jumps to the input.
See Figure 53. Any entry from the Gate Input List can be used to drive the Deadtime and Leadlag
Follow switches.
Figure 53. Follow Switches

INPUT
FOLLOW OFF
OUTPUT
FOLLOW ON
OUTPUT
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4. Configuration
Totalizers
Up to two 7-digit totalizers are available. The totalizers can be configured to integrate up to a
preset value or down from a preset value to zero and produce a logic event output. Any internal or
external signal can be totalized.
Figure 54. Totalizer
Assignable signal for TOTAL 1, 2
DEC PT
(position)
PRESET
Input
SOURCE
nnnnnn . n
TOTAL 1, 2
Totalized Value
(7 digits plus configurable
decimal point position)
Logic Output
(Assignable Signal)
TYPE (Count up or down)
CNT/SEC
RESET
HOLD
Totalization and EXACT tuning are mutually exclusive. For example, if one controller is
configured for EXACT tuning, only the other faceplate can be configured for totalization; if both
controllers are configured for EXACT tuning, no totalizers will be available. However, if
FUNCtion 1 is configured for EXACT, a signal associated with FUNCtion 1 can be totalized
with the totalizer in FUNCtion 2.
1. Begin CONFIGuration of a Totalizer at Location 5-A1 in the structure diagrams.
2. At the prompt TOTAL n, select YES and ACKnowledge if you wish to configure the
totalizer.
3. Specify its TAG, the SOURCE of what is being totalized from the Signal Distribution
List, the CouNT/SECond (at 100% signal level), the DECimal PoinT position in the
totalizer display, the events from the Gate Input List that you wish to HOLD
(deactivate) and RESET the totalizer, and the TYPE of totalizer (COUNT UP or
COUNT DOWN).
4. Tune the totalizer at Location 5-A3 in the structure diagrams by specifying TOTAL
(the starting point if not zero or the preset value), PRESET (the value it is to count up
to or down from), and STATE (whether the totalizer is to be enabled [COUNT] or
disabled [HOLD] or RESET). The STATE is only available in the menu at this
location when the HOLD and/or RESET switches in the totalizer configuration
menu (Location 5-B1) have been sourced to NONE.
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Example 1: Inventory Control
A process flow requires continuous totalization. The totalizer source is conditioned signal A from
analog input 1. The totalizer is to count up. Since totalization is continuous, the HOLD and
RESET logic inputs are not required. The scale factor is set to produce 3600 counts/minute (60
counts/second) when the flow rate is at 100%.
1. Begin configuration at TOTAL 1 at Location 5-A1 in the structure diagrams.
2. If TOTAL 1 reads NO, change to YES.
3. Specify desired TAG.
4. Specify SOURCE as signal A.
5. Specify CNT/SEC as 60.0 counts/second.
6. Specify DEC PT as 1 (meaning one place from the right).
7. Specify HOLD and RESET as OFF. This help prevent the totalizer from being
interrupted (HOLD) or cleared (RESET) unless reconfigured.
8. Specify TYPE as COUNT UP.
This is shown pictorially as:
Figure 55. Inventory Control
DEC PT = 1
SOURCE
A
TOTAL 1
Display
TYPE = COUNT UP
CNT/SEC = 60.0
HOLD = OFF
RESET = OFF
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4. Configuration
Example 2: Batching
A totalizer is used to batch 150,000 pounds of a product. The product rate is computed in a
calculation. The totalizer is reset manually by the operator. A logic signal trips a solenoid when
the batch ends. The scale factor is set to produce 100 counts/second when the product rate is
100%.
1. Begin configuration at TOTAL 1 in Location 5-A1 in the structure diagrams.
2. If TOTAL 1 reads NO, change to YES.
3. Specify desired TAG.
4. Specify SOURCE as CALC 1.
5. Specify CNT/SEC as 100.
6. Specify DEC PT as 1 (meaning one place from the right).
7. Specify HOLD as TOTAL 1 from the Gate Input List. This helps ensure that the
totalizer will stop when the PRESET value is reached.
8. Specify RESET as NONE. This allows the TOTAL to be RESET (cleared to zero) in
OPTUNE or ALLTUNE at Location 4-B3 in the structure diagrams.
9. Specify TYPE as COUNT UP.
10. Go to Location 4- B3 in the structure and specify PRESET 1 as 150,000.
11. Go to CO 1 at Location 5-C2 in the structure and select TOTAL 1 from the menu to
actuate CO 1 for the solenoid.
This is shown through a pictorial representation as:
Figure 56. Batching
PRESET = 150,000
DEC PT = 1
SOURCE
TOTAL 1
CALC 1
Display
TYPE = COUNT UP
CO 1
CNT/SEC = 100
RESET = NONE
HOLD = TOTAL 1
Set Point
The set point may be configured as LOCAL, REMOTE/LOCAL (R/L), or RATIO. Whatever
your selection, you may configure the controller to have the local set point track the measurement
by specifying a parameter from the Gate Input List to activate the measurement tracking switch.
This is done at MEASTRK in Location 5-G1 in the structure diagrams.
If you configure the controller R/L, you may also configure the following features:
 Specify that the local set point track the remote set point (LOCTRK) when in
REMOTE and when one of the parameters from the Gate Input List activates the set
point local tracking switch.
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 Specify that a parameter from the Gate Input List SWITCH remote to local control
and vice versa. A configuration of ON or to an entry from the Gate Input List whose
logic is in the True state fixes the control in the REMOTE mode. Conversely, OFF or
(False) fixes the control in the LOCAL mode.
NOTE
A switch assignment other than NONE has priority over the R/L key or the
communication link. For example, if R/L is assigned through Gate 1, the R/L key or a
supervisory host command to change R/L status is ignored.
 Specify (in STARTUP) whether the controller is to be in REMOTE or LOCAL upon
restart after a power failure.
 Specify INBIAS applied to the remote signal.
 Specify the SOURCE of the remote set point to be any signal from the Signal
Distribution List.
To configure your instrument as a ratio controller, see ““Ratio Control””.
Configuration of these features are done at Location 5-G1 in the structure diagrams.
Lastly, the set point may be FORMATted to be linear, squared, square rooted, or characterized
over one of two selectable series of points.
When configured as REMOTE/LOCAL, the R/L key on the front of the controller can change
the set point operation from REMOTE to LOCAL and vice versa. The function switch R/L must
be configured to NONE. If the W/P feature is configured ON, the controller must be in the
panel mode (P).
Set Point Configuration Example 1
A Remote/Local set point controller is required. The local set point must track the remote value
when the controller is in Remote.
1. Access CONFIG FUNC 1 (Location 5-A1) and go to SET PT (Location 5-G1).
2. Select R/L for TYPE.
3. Go to LOCTRK (Location 5-H1) and select ON from the menu. The configuration
of this example is now complete.
Set Point Configuration Example 2
The R/L status should always be in Remote during normal operation.
1. Access CONFIG FUNC 1 (Location 5-A1) and go to SET PT (Location 5-G1).
2. Select R/L for TYPE.
3. Go to SWITCH (Location 5-H1) and select ON from the menu. The configuration
of this example is now complete.
Set Point Limits
Set point limits apply to both local and remote set points. Specify them in ALLTUNE at Location
4-B1 of the structure diagrams.
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4. Configuration
Ratio Control
When using the 762CNA as a ratio controller, access SET PT at Location 5-G1 in the structure
diagrams and select RATIO as the TYPE. Specify the RL LOGIC (LOC TRK, SWITCH, and
STARTUP) as described in “Set Point”. Then select the SOURCE of the ratio SIGNAL and set
an INBIAS if required. The biased signal can be multiplied by a RANGE factor of from 0 to 1 to
0 to 5. It then can have an OUTBIAS added. See Figure 57. The ratio SOURCE can be entered
from the controller faceplate (or workstation) or can be any signal ROUTED from the Signal
Distribution List as configured.
Figure 57. Ratio
Faceplate Control
of Local Set Point
Set Point
Limits
Signal Out
Remote
Ratio Signal
+
Ratio
INBIAS
Ratio Gain
x
+
OUTBIAS
Output Summing and Multiplying
The OUTPUT can be modified by adding to it (OUTSUM), or multiplying it by (OUTMUL) a
parameter from the Signal Input List in percent (divided by 100). This is done in OUTPUT
MODIFIER at Location 5-G2 in the structure diagrams. The result then can then be
FORMATted as linear, squared, square rooted, or characterized over one of two selectable series of
points. See Figure 58.
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Output Tracking
The OUTPUT can also be configured so that the OUTTRK SWITCH entry made from the
Gate Input List causes the output to track (OUTTRK) a SOURCE that is specified from the
Signal Input List. This is done at Location 5-G2 in the structure diagrams. See Figure 58. The
output is not bumped on a transfer from track to run.
Figure 58. Output Modification and Tracking
SOURCE
SIGNAL
+
C1 OUT
C2 OUT
x
OUTSUM
OUTMUL
SOURCE
SIGNAL
LINEAR
SQ ROOT
SQUARED
CHAR 1
CHAR 2
OUTTRK
SWITCH
SIGNAL OUT
SIGNAL TO BE TRACKED
Split Range Output
You can configure the two analog outputs of the 762CNA for split range control of two valves by
a single controller. This feature is available on Controller 1 and in Cascade and Auto Selector
configurations. A typical application is illustrated in Figure 59. In this application, temperature is
controlled by alternately controlling the flow of hot water and chilled water to a vessel.
As shown in the diagram, when the controller output is in the upper part of its range, the chilled
water valve is closed and the hot water valve is throttling. Conversely, when the controller output
is in the lower part of its range, the hot water valve is closed and the chilled water valve is
throttling. The split point and its associated dead band determine how this transition occurs.
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4. Configuration
Figure 59. Split Range Application
Controller
TIC
HOT WATER
CHILLED
WATER
Controller Output (C1 OUT or C2 OUT)
100%
100%
HI
ACT
0%
0%
LOW
ACT
0%
Hot Water Valve Position
AOUT 1 (INC/INC)
Split Point
Cold Water Valve Position
AOUT 2 (INC/DEC)
100%
To configure Split Range Output, go to CONFIG OUTPUTS at Location 5-C2 in the structure
diagrams and specify SPLT RNG YES. Specify the SPLIT PT in percent of controller output.
Next, set the DEADBAND.Then specify the controller action in the low (LOW ACT) and high
(HI ACT) portions of the range. In each portion of the range, you may configure the analog
output (AOUT n) to increase with decreasing controller output (Cn OUT) (INC/DEC) or
increase with increasing controller output (INC/INC). See Figure 60. Lastly, specify the
deadband which creates a symmetrical zone on either side of the split point during which no
output change occurs.
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Figure 60. Split Range Diagrams
Controller Output (C1 OUT or C2 OUT)
Controller Output (C1 OUT or C2 OUT)
100%
100%
AOUT 1 (INC/INC)
100%
LOW
ACT
0%
Split Point
100%
LOW
ACT
AOUT 2 (INC/DEC)
100%
100%
0%
AOUT 1 (INC/INC)
LOW
ACT
0%
0%
AOUT 2 (INC/INC)
0%
Controller Output (C1 OUT or C2 OUT)
100%
0%
AOUT 1 (INC/DEC)
HI
ACT
HI
ACT
0%
100%
Split Point
100%
Controller Output (C1 OUT or C2 OUT)
100%
AOUT 1 (INC/DEC)
HI
ACT
HI
ACT
0%
0%
0%
Split Point
100%
0%
LOW
ACT
AOUT 2 (INC/INC)
0%
Split Point
AOUT 2 (INC/DEC)
100%
In Figure 61, note that moving the split point effectively changes the gain between AOUT 1 and
AOUT 2. In the left diagram, the gain of AOUT 1 to C1 OUT and AOUT 2 to C1 OUT are
equal since a 50% change in C1 OUT results in a 100% change in both AOUT 1 and AOUT 2.
In the right diagram, the gain of AOUT 2 to C1 OUT is higher than AOUT 1 to C1 OUT since
only a 33% change in C1 OUT causes a 100% change in AOUT 2 while a 67% change in C1
OUT is required to cause a 100% change in AOUT 1. This relationship is convenient for loop
tuning.
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4. Configuration
Figure 61. Effect of Shifting Split Point
Controller Output (C1 OUT or C2OUT)
Controller Output (C1 OUT or C2OUT)
100%
100%
AOUT 1 (INC/INC)
100%
0%
100%
LOW
ACT
0%
0%
AOUT 1 (INC/INC)
HI
ACT
HI
ACT
50%
100%
Split Point
AOUT 2 (INC/INC)
33%
0%
0%
100%
LOW
ACT
0%
Split Point
AOUT 2 (INC/INC)
In Figure 62, note that a deadband of 0% results in no delay between AOUT 1 and AOUT 2 at
the split point; e.g., one valve opens when the other closes. Adding a deadband introduces a delay
between AOUT 1 and AOUT 2 at the split point; e.g., both valves are closed. The larger the
deadband, the longer both valves are closed.
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Figure 62. Effect of Deadband
NO DEADBAND
100%
C1 OUT
WITH DEADBAND
100%
HI ACT
C1 OUT
DEADBAND
SPLIT 50%
POINT
SPLIT
POINT 50%
LO ACT
0%
0%
100%
AOUT 1
(INC/INC)
Increase of AOUT 1
delayed by deadband
100%
AOUT 1
(INC/INC)
HI ACT
0%
0%
100%
100%
LO ACT
AOUT 2
(INC/DEC)
0%
Increase in AOUT 2
delayed by deadband
AOUT 2
(INC/DEC)
0%
Output Limits
High and low external limits (EXTLIM) can be configured to be any SOURCE selected from the
Signal Distribution List. Each limit can be transferred between its internal and external value by a
SWITCH from the Gate Input List. ON (True) sets the limits to external; OFF (False) and
NONE to internal. Configuration of EXTLIM is done at Location 5-G3 in the structure
diagrams. Internal limits can be tuned in ALLTUNE (OPTUNE) at Location 4-B1. The internal
limits are independent of the external limits. Output limits are applied prior to split ranging.
If batch action is used, OUT HLIM represents Hi Batch Trip and OUT LLIM represents Lo
Batch Trip.
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4. Configuration
Output Action
You may configure the controller algorithm output (C1 OUT or C2 OUT) to increase with
decreasing measurement (INC/DEC) or increasing measurement (INC/INC). This is done at
ACTION in Location 5-G2 in the structure diagrams.
Output Upon Restart (STARTUP)
The value of output upon restart (STARTUP) after a power loss can be configured to any value
from 0% to 100% or the last value before the power loss occurred. This is done at OUTPUT
STARTUP in Location 5-G3 in the structure diagrams.
Output Reverse
The output bargraph on the controller display is normally a direct indication of the output signal
and the manipulated variable. Increasing the controller output raises the bargraph (and the
corresponding digitally displayed value), increases the manipulated variable and usually, but not
always, increases the process or measured variable.
In some applications, a valve operator or positioner is selected for fail-safe or other reasons, where
an increase in controller output actually decreases the manipulated variable. If not addressed, this
can result in confusion when viewing the display, as well as improper implementation of high-low
alarms and high-low limits.
This can be easily compensated for, by first completely configuring the controller just as if the
manipulated variable changed directly with the output, and then, as the last step, simply selecting
YES for REVERSE in the OUTPUTS, AOUT1/AOUT2 menu (Location 5-D2 in the structure
diagrams). When configured in this manner, the output bagraph will rise and the manipulated
variable will increase when the analog output decreases, thus providing the proper response with a
reverse acting valve operator.
Output Bargraph
The Output Bargraph causes any item from the Signal Distribution List (Location 6) to be
displayed on the output (right) bargraph. This allows you to indicate a true (live) output. For
example, the output from a valve position transmitter could be connected to an unused input
which then could be displayed on the output bargraph. This feature is configured at OUTBAR in
Location 5-E2 in the structure diagrams.
Characterizers
Characterization consists of one or two curves of 8 segments (9 points). Each curve may be
assigned to any of the following signals:
 Analog Input A, B, C, or D (Location 5-B2)
 Frequency Input E or F (Location 5-B2)
 Measurement of a Controller, MEAS (Location 5-G2)
 Set point of a Controller, SET PT (Location 5-G1)
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 Nonlinear Controller, NONLIN (Location 5-G2)
 Output of a Controller, OUTPUT (Location 5-G2)
 Calculation, CALC (Location 5-C1)
NOTE
Vertical slope of a curve is not allowed (for any one value of X there can be only one
value of Y).
Entries may be expressed in whole numbers or to tenths of a whole number.
The specification of the sequence of X, Y pairs is done at Location 5-D1.
Nonlinear Control
The controller error (difference between measurement and set point) may be characterized over
one of two selectable series of points at Location 5-G2 in the structure diagrams. This type of
control is often used for difficult pH applications when the set point is not changed and when set
as a deadzone for nonlinear filtering of detected error noise. See section immediately above for
more information on Characterization.
pH Display
The display of the measurement, local set point, or remote set point may be displayed before or
after the signal is characterized. If pH DISP is activated (ON) the displays are before
characterization. This feature is often used on a pH application when it is important for the
operator to read pH, but control be performed on concentration. Specify this feature at Location
5-E2 in the structure diagrams.
Serial Communications
The controller can be operated from either a computer workstation (W) or from its panel (P).
This can be changed by the W/P key on the front of the controller if W/P is configured ON
(Location 5-C2), workstation PRIORITY is configured P or BOTH (Location 5-D3), and the
W/P function SWITCH is configured to NONE (Location 5-D3). If the controller is to be
operated via a computer, W/P must be configured ON and several other parameters must be
configured as described in Table 21.
Table 21. Configuration of Serial Communication Parameters
Parameter
Configuration Method
ADDRESS:
Enter the device number (0 to 99) on the serial communication port.
BAUD:
Enter the data transfer speed (2400,4800, 9600, or 19200 bits/second)
between the host and the controller.
PARITY:
Enter odd, even, or none.
TIMEOUT:
Enter the length of time that communication is interrupted before
FLUNK action is implemented. However, a TIMEOUT of 0 equals no
FLUNK feature.
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4. Configuration
Table 21. Configuration of Serial Communication Parameters
Parameter
Configuration Method
FLUNK:
Enter state of W/P desired if serial communication is lost. Choices are
W, P, and LAST W/P status before loss occurred. To help assure
continuous operator control, set FLUNK to P if PRIORITY is set to W.
When FLUNK is set to W or to LAST W/P, the W flashes after TIMEOUT
expires.
PRIORITY:
Specify W or P to select whether the workstation or panel can switch
controller operation from W to P and vice versa. Specify BOTH if
switching can be done by both the workstation and the panel.
STARTUP:
Enter state of W/P desired upon restart after a power failure.
SWITCH:
An entry from the Gate Input List here enables an activation of the
specified switch to change the controller operation from W to P or vice
versa. A configuration of ON or to an entry from the Gate Input List
whose logic is in the True state fixes the control in the WORKSTATION
mode. Conversely, OFF or (False) fixes the control in the PANEL mode.
NOTE
A switch assignment other than NONE has priority over the W/P key or the
communication link. For example, if W/P is assigned through Gate 1, the W/P key or
a supervisory host command to change W/P status is ignored.
Communications Example
Serial communications will be used to supervise the controller at 2400 baud and with address
number 6. The controller should FLUNK to manual and panel after a TIMEOUT of 10 minutes;
that is, when the host has had no communication with the controller for over 10 minutes.
1. Access CONFIG FUNC 1 and go to A/M (Location 5-G2).
2. Go to FLUNK and select M from the menu.
3. Access CONFIG W/P at Location 5-C2 and select ON.
4. Enter 06 in the ADDRESS block.
5. Select 2400 from the menu for BAUD.
6. Select EVEN, ODD, or NONE for PARITY as desired.
7. Go to TIMEOUT and confirm that the factory-configured value of 10.00 minutes is
still in place. Change value if necessary.
8. Select P from the menu for FLUNK. The configuration of this example is now
complete.
Toggle
If TOGGLE is configured ON, the user may go from one of the User Interface modes (READ or
SET) to the Normal Operation mode and return to the function from which the User Interface
was exited using the TAG key. TOGGLE functions above and below the PASSCODE barrier.
However, this feature is particularly useful if the function is after the PASSCODE.
TOGGLE only applies if the controller is in PANEL (P) mode. Also, TOGGLE defaults to OFF
in a power failure.
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Lastly, if TOGGLE is configured and the user is in the firmware structure below the PASSCODE
but wants to go to a section of the structure above the PASSCODE, he must do the following:
1. Press a long TAG (more than 0.3 second). Display will read EXIT PASS NO.
2. Using an arrow key, change the NO to YES. Press ACK key. Display will show
Normal Operation.
3. Pressing the TAG key again will bring you to READ in the firmware structure and not
to the function from which the user interface was previously exited.
NOTE
If NO is ACKnowledged in Step 2, the display will show Normal Operation.
However, the next use of the TAG key will return you to the function from which the
User Interface was exited.
Figure 63 expresses the Toggle feature pictorially. The configuration parameter ALARM 3
ACTION was selected arbitrarily for the example in this figure.
Figure 63. TOGGLE Feature
TOGGLE OFF
ALARM 3
ACTION
TOGGLE ON
ALARM 3
ACTION
TAG
NORMAL
OPERATION
TAG
NORMAL
OPERATION
ALARM 3
ACTION
LONG TAG
EXIT PASS
NO
NORMAL
OPERATION
TAG
TAG
READ
TOGGLE ON
(Moving from below to above passcode barrier)
TAG
ALARM 3
ACTION
ALARM 3
ACTION
EXIT PASS
YES
NORMAL
OPERATION
TAG
READ
Batch Control
You can configure the 762CNA to operate in discontinuous batch mode. If so configured, the
process starts and stops without causing controller windup and subsequent overshoot if
PRELOAD is correctly set as the measured variable re-enters the control range. Configure this
feature ON or OFF at Location 5-G3 in the structure diagrams. The PRELOAD adjustment is
made in ALLTUNE/OPTUNE at Location 4-B1. Refer also to the Output Limits section on
page 99.
Integral Feedback
Integral feedback is used to prevent controller windup when the control algorithm output cannot
manipulate the valve. Refer to the Cascade Controller example on page 79 for a practical
application of this function.
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4. Configuration
The SOURCE of the INTegral FeedBacK can be configured to be a signal from the Signal
Distribution List. In a typical control loop, the integral feedback is sourced to the controller
output (Cn OUT). This is done in INT FBK at Location 5-G3 in the structure diagrams. The
correct connection is made automatically for cascade and auto select configurations.
Rate of Change Alarms
A Rate of Change alarm is used when the change of a variable in an increment of time is
important; i.e., the change in temperature per change in unit time in a reactor. A Rate of Change
alarm has one input variable. The alarm levels are entered in percent and referenced to time. The
units are percent per minute. When the attached monitored variable exceeds the alarm level, an
alarm condition occurs and the Boolean output associated with that alarm is set to True. The time
interval for trip points is fixed at one minute; e.g., a level of 50% equals 50%/minute. The time
between the alarm condition and activation of the alarm is typically 5 to 10 seconds. It takes less
time if the rate is way over the limit but longer if the rate is only slightly over the limit.
The input variable is assigned from the Signal Distribution List using the parameter ATTACH at
Location 5-B2 in the structure diagrams.
Alarm levels and deadband have a different meaning for ROC alarms. For an ROC alarm, alarm
levels and deadband are interpreted as percent change per minute. This may be thought of as an
absolute alarm applied to dm/dt instead of to m, where dm/dt is the rate of change in percent per
minute. The filter time is 6 seconds and dm/dt values are approximately 1% precise. A minimum
of 5%/minute deadband should be used on ROC alarms. Lastly, Rate of Change alarms can not
be configured for display.
Configuration Copy Accessory
A configuration copy accessory (Part L0122TU) is available. With this accessory, additional
controllers can be configured to match an existing one without the need to go through the
step-by-step configuration procedure previously described.
Even if an exact duplicate configuration is not desired, the configuration copy accessory can still
be used. If the configuration of the second controller is to be similar to the first, the first one can
be copied and the copy then changed using the step-by-step procedures described in this chapter.
The procedure used to copy a configuration is as follows:
1. Depress latch under front panel to withdraw controller. Withdraw controller several
inches from housing (power is removed from unit).
2. Release the locking latch on the socket of the memory module (NOVRAM) and lift
the module out of its socket. Identify this module so that it cannot be confused with
the module to be configured.
3. Insert configuration copy accessory (See Figure 64) into this socket with ribbon cable
toward front of controller and lock latch of socket.
4. Release both latches on copy accessory. Position configured memory module so that
the key is on bottom and insert module into left side of accessory (labeled “ORIG”).
Lock left accessory latch.
5. Insert unconfigured memory module similarly into right side of accessory (labeled
“COPY”). Lock right accessory latch.
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4. Configuration
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6. Reconnect power by sliding controller back into housing with ribbon cable extending
out the front of the housing. When lower display shows value of engineering units,
new memory module is configured. This takes only a few seconds.
7. Withdraw controller from housing. Release all three latches and remove the two
modules and copy accessory.
8. Plug original and newly configured memory modules back into their controllers. Lock
latches. Reinstall controllers into their housings.
9. Calibrate controller with newly configured memory module - see Chapter 7,
“Calibration, Troubleshooting, Maintenance”.
Figure 64. Configuration Copy Accessory
ORIG
COPY
Ribbon Cable
Plug into NOVRAM socket
Plug ORIG and COPY NOVRAMS into labeled sockets
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106
4. Configuration
5. Operation
The purpose of this section is to describe all features of the 762CNA Controller that are of
interest to the process operator — how to read the displays, how to operate the keys, and how to
perform various operator functions.
The chapter is divided into the following major sections:
 “Functions”
 “Controls and Indicators”
 “Structure Diagrams”
 “Modes of Operation”
 “SET OPTUNE”
 “NORMAL Mode Operation”
 “Operation as an Auto/Manual Station”
 “Operation as a 3-Variable Indicator Station”
 “Operation as an Auto-Selector Station”
 “Operation as a Cascade Control Station”
 “Totalizer Operation”
 “READ Mode Operation”
Functions
The 762CNA provides two functions (with totalizers) that can operate as:
 Two independent controllers
 Single-station cascade controller
 Auto selector controller
 Single or dual auto/manual control station
 Single or dual 3-variable indicating station
The various functions can be intermixed, subject to some configuration constraints.
Block Diagram
Figure 65 is a simplified block diagram that shows the inputs, outputs, and functions available in
a 762CNA instrument. Explanations of each item follow the diagram. For detailed specifications,
refer to Appendix A, “Specifications”.
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5. Operation
Figure 65. Block Diagram of a 762CNA Control Station
Panel Displays
RTD (100 Pt)
Analog
Outputs (2)
Input Signal Conditioning
Analog
Inputs (4)
Frequency
Inputs (2)
Discrete
Inputs (2)
Controller*
Function
Controller*
Function
1
2
Four alarms
Calculations, Totalizer,
and Logic Functions
Operator Keypad
Discrete
Outputs (2)
RS-485 Serial Communication
* AUTO/MANUAL STATION OR 3-BAR INDICATOR
FUNCTIONS ARE AVAILABLE AS ALTERNATES TO
THE CONTROLLER FUNCTIONS.
Alarms
Four alarms, assignable to any input or output signal, are provided. All alarms are 2-level
(high/high, high/low, low/low) and may be configured to trigger on the present value of a signal, a
difference between two signals, or on the rate-of-change of a signal. They may also be set up as
latching, non-latching, or permissive alarms. Permissive alarms do not require operator
acknowledgment.
Signal Conditioning
Input signals can be configured with any of a wide range of input signal conditioning functions to
match any measurement or display requirement. Scaling gains and biases, square, square root, and
characterized profiles, as well as filtering, are also supported.
Calculation Functions
If so configured, the variables used for indication and control can be computed values – the results
of algebraic or Boolean calculations. Three multi-term calculation functions are provided.
Totalizers
Two 7-digit totalizer functions are available (except in any function block in which EXACT is
configured). The totalizers may be assigned to any internal or external signal and may be set to
count up to or down from a preset value. When a totalizer reaches the target value, a logic event
output is generated, which may be used as an input to a number of other functions. Reset and
hold logic is provided for each totalizer.
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5. Operation
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Inputs
Type
No.
Description
Analog
4
4-20 mA non-isolated or 1-5 V dc (any combination). Using a hardware
option, you may connect a 100 platinum RTD to Analog Input 1.
Analog inputs can be assigned to any analog function.
Frequency
2
1 to 9999 Hz. May be assigned to any analog function. May also be
combined into one up/down pulse input signal.
Discrete
2
Non-isolated contact or transistor switch inputs. May be assigned to
any binary function.
Outputs
Type
No.
Description
Analog
2
4-20 mA non-isolated. Analog Output 2 can be changed to 1-5 V dc by
moving a jumper. Analog outputs can be assigned to any function
(subject to configuration constraints). Isolation is available as an option
on Analog Output 1.
Discrete
2
Non-isolated open collector NPN transistor switch outputs. May be
assigned to any binary function.
Data Communication
Two-way data communication with remote computers is provided through an RS-485 serial port.
Using this feature, you can exercise supervisory control of the controller from a remote host
computer, including upload/download of measurement, configuration, and control status
information. A single host can supervise up to 30 control stations on a single loop. Addresses are
available for 100 stations. An RS-232 to RS-485 converter connects to 90 stations; an OPTO-22
isolator board to 30; and an I/A Series Instrument Gateway to 60 units in Version 4.0 or to 48 in
Versions 2 and 3. The major determining factor in defining the maximum number of stations is
speed of response between host and units.
EXACT Control
The EXACT control function provides automatic adaptive tuning for either or both control
loops, subject to totalizer configuration constraints. If the controller is configured with EXACT,
the function can be enabled or disabled through the keypad or any other switch signal such as a
contact input or the state of a gate or alarm.
Security
The unit may be configured to require you to enter a passcode before performing certain TUNE
operations such as changing parameter values.
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5. Operation
Controls and Indicators
Operator controls and indicators are located on the front panel. Figure 66 shows the panel
arrangement and identifies the function of each element. Figure 67 on page 112 shows the
arrangement and functions of the keypad.
Figure 66. Panel Display (Faceplate 1 or 2)
Upper digital display
Lower digital display
Bargraph indicator
FIC
150.5
WP
Red LED Fault
Indicator (normally
not visible)
Workstation/Panel
Status
RL
Remote/Local
Set Point Status
AM
Auto/Manual
Status
Overrange indicator
Set Point Indicator
Left Bargraph
(Set Point)
Center Bargraph
(Measurement)
Alarm Indicator
Right Bargraph
(Output)
Underrange indicator
Keypad
110
W/P
R/L
A/M
SEL
TAG
ACK
5. Operation
MI 018-885 – August 2018
Upper Digital Display
In NORMAL, shows loop tag or scaled value of variable with
engineering units label. In READ and SET modes, shows a category
of parameter or a message.
Lower Digital Display
In NORMAL, shows present value of variable identified by bargraph
indicator. When an alarm exists, displays ID of variable. In READ and
SET, shows parameter or message detail.
Bargraph Indicator
Identifies variable being displayed on Lower Digital Display. There are
also “no indicator” positions. See “Bargraph Indicator Positions” on
page 115.
Overrange Indicator
On steady when variable is between 100% and 102%. Flashes when
variable is above 102%.
Left Bargraph
Shows present value of Variable #1 (usually set point).
Center Bargraph
Shows present value of Variable #2 (usually measurement).
Right Bargraph
Shows present value of Variable #3 (usually controller output).
Underrange Indicator
On steady when variable is between 0% and -2%. Flashes when
below -2%.
Keypad
Operator entry keypad. (For details, refer to Figure 67.)
When ON, shows detected hardware error, such as watchdog timer
Red LED Fault Indicator timeout, low ac voltage or primary power.
WP
Status indicator for Workstation (W) or Panel (P) control. W flashes if
communication fails when in W mode and flunk is set to W. Neither W
or P are lighted when W/P is configured OFF.
RL
Status indicator for Local (L) or Remote (R) set point and for Ratio (R)
or Local (L) set point. Neither R or L are lighted when set point TYPE
is configured as LOCAL.
AM
Status indicator for Automatic (A) or Manual (M) control. Both are on
when OUTTRK is active. Flashes A, M, or AM when open loop
condition exists. An open loop occurs:
When the inactive controller is selected in an auto-selector
configuration.
In a cascade primary loop, when the secondary is in Manual,
Local, or OUTTRK.
When limits prevent the output from moving in either direction, as
when limits are crossed or opposing.
Alarm Indicator
Flashes when active, steady when acknowledged. Off when returned
to normal after being acknowledged.
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5. Operation
Keypad
Figure 67. Keypad
W/P
R/L
A/M
SEL
TAG
ACK
In NORMAL mode, press these buttons to increase or decrease value of set point, ratio
gain, or output by one increment. Press and hold to increase the rate of change in
value.
W/P
Press to transfer control between computer Workstation and controller front Panel when
W/P switch priority is Panel and communications are enabled (W/P = ON).
R/L
Press to transfer between Remote and Local (or Ratio and Local) set point when set
point TYPE is configured as R/L (or RATIO) and R/L SWITCH is set to NONE.
A/M
Press to transfer between Auto and Manual control when A/M SWITCH is set to NONE.
SEL A short press (200 to 300 ms selects the next variable for display on the Lower Digital
(Short Display (alphanumeric). Also provides access to remote set point, ratio, and totalized
press) count, when so configured.
SEL A long press (300 ms) toggles between Faceplates 1 and 2, provided they are
(Long configured and active. If only one faceplate is configured, the key performs the same
Press) functions as a short press.
TAG
In NORMAL mode, press to go to READ mode. If TOGGLE feature is configured, press
to go to last function from which READ or SET was exited. In READ or SET mode,
press to go to NORMAL mode.
ACK
In NORMAL mode, press to acknowledge an alarm. In READ or SET, press to move
one step through structure, or to accept a new parameter entry.
If none of the keys are operational, the keyboard enable/disable link is in the disable position. See
page 37.
Structure Diagrams
The 762CNA is a powerful instrument with many user-adjustable parameters, displays, and
possible configurations. It is beneficial to navigate through the various displays and parameter
settings called the product structure using a map that tells you where you are in the structure,
where you want to go, and how to get there. The map is called a structure diagram. A series of
structure diagrams for the controller is included in Appendix C. Please use these diagrams as an
aid to understanding the operating procedures discussed in this chapter.
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5. Operation
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Modes of Operation
The 762CNA operates in one of three modes:
Mode
Description
NORMAL
In this mode, you can perform the usual configured functions such as reading
values of variables, changing set points or output values, switching between
auto and manual or remote and local, acknowledging alarms, transferring
between faceplates, etc.
READ
In this mode, you can read the value and status of parameters, variables, and if
permitted, the current configuration.
SET
In this mode, you can change values of parameters that have been configured
as operator-adjustable and, when past the passcode, values of non-operatoradjustable parameters and the configuration.
This section of the manual describes NORMAL and READ modes of operation. Refer to Section
4 – Configuration for detailed information on operating in the SET mode.
SET OPTUNE
The operator can set parameters in ALLTUNE by first entering a passcode. He may also be
permitted to adjust certain parameters in OPTUNE without entering a passcode. The parameter
groups he can adjust are determined by the configuration of SHOWOP, which is described in
Chapter 4, “Configuration”. The various parameter groups that can be selected by SHOWOP are:
 TUNE C1
 C1 LIMIT
 TUNE C2
 C2 LIMIT
 CONSTS
 ALARMS
 TOTALS
 RD CFG
The steps necessary to perform the permitted SET OPTUNE functions can be determined by
referring to Structure Diagram 4 on page 221.
NORMAL Mode Operation
When operating in NORMAL mode, you can:
 Read values of the three variables displayed on the bargraphs and, if the unit is so
configured, read the values of remote and local set points and the present values of
totalizers.
 Change control status (transfer between Workstation/Panel, Remote/Local,
Ratio/Local, and Auto/Manual).
 Change set point or ratio in Auto and Manual, or change output in Manual, if the
unit is configured to permit such changes.
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5. Operation
 Display/acknowledge alarms.
 Enable/disable EXACT tuning, subject to configuration constraints.
 Switch from one faceplate display to the other.
 Switch from NORMAL mode to READ and SET modes and return.
 Initiate, hold, or reset totalizers, if so configured.
Entering a Passcode
The unit will prompt you to enter an alphanumeric passcode before permitting you to perform
certain restricted functions. The factory default is (blank)(blank)(blank), which can be entered by
pressing ACK three times. (Refer to the structure diagrams in Appendix C for assistance in
understanding the procedure described below.)
To enter a passcode (starting in NORMAL mode):
1. Press TAG. This places you in READ mode.
2. Press to go to SET.
3. Press ACK to go to OPTUNE.
4. Press  to go to SECURE.
5. Press ACK to go to PASSCODE =. (With cursor under first digit location, the digit
flashes.)
6. Press  repeatedly (or press/hold) until first digit of your passcode is displayed.
7. Press ACK to accept first digit and move to next digit.
8. Press  repeatedly (or press/hold) until second digit of your passcode is displayed.
9. Press ACK to accept second digit and move to next digit.
10. Repeat entry steps for next digit.
When all digits have been entered correctly, the display shows ALLTUNE. You may now proceed
with your SET operation.
If the passcode is not accepted, the display shows the message, WRONG PASSCODE. Press TAG
to return to normal operation and start over.
Reading Values of Variables
The three bargraphs display the current values of the 3 variables – usually assigned to set point,
measurement, and output. The bargraphs indicate 0 to 100% of full scale, with each display
segment equal to 2% of full scale.
To display the numerical value and measurement units of any one of the three variables on the
lower line of the digital display, press the SEL key as many times as necessary to advance the
bargraph indicator to the desired variable.
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5. Operation
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Bargraph Indicator Positions
You can identify which variable is being displayed by observing the position of the bargraph
indicator. If the indicator is over a bargraph, that variable is currently displayed on the Lower
Digital Display.
Three indicator positions are always available for the bargraphs. In some situations, however, four
positions – three variables and one no-indicator – are available. In other situations, five positions –
three variables and two no indicators – are available.
Position 4
Position 4, a no-indicator position, is used when the unit is configured for remote set point or
ratio operation. In remote set point operation, when you use the SEL key to move the bargraph
indicator to Position 4 (no indicator visible), the Lower Digital Display shows the value of the set
point not currently in use. This means that if the controller is in local mode, the Lower Digital
Display shows the value of the remote set point, the one not currently being used. Similarly, if the
unit is in remote mode, the Lower Digital Display shows the value of the local set point, which can
be adjusted by the  and  keys. In both cases, the left bargraph shows the value of the set point
currently in use. Note that the top line of the display is not affected.
For situations in which you configure a local (no remote) set point plus a totalizer, the Lower
Digital Display shows the current value of the totalizer when you move the bargraph indicator to
Position 4 (no indicator visible).
Position 5
For situations in which you configure both a remote set point (or ratio) and a totalizer, a second no
indicator position, Position 5, becomes available. Position 4 is then used for displaying the
inactive set point value and Position 5 is used for displaying the totalizer value.
To determine which set point is currently being used, note which symbol (R or L) is illuminated
at the right of the panel. If the unit is configured for local set point only, the R/L indicators are
not visible.
For information on operation as a ratio controller, refer to Table 24 on page 120.
Figure 68 on page 116 and Figure 69 on page 117 show faceplate displays as they appear under
the various operating situations described above.
The top line of the display for Position 5 is the totalizer tag which was configured in Location 5B1 of the structure diagrams.
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5. Operation
Figure 68. Faceplate Displays When Configured for Local Set Point and Totalizer
FIC
FIC
148.8
144.2
A
Bargraph indicator over
Left Bargraph. Display
shows local set point
value. No R, L, W, or P
visible. (Set point type
local only.) Auto mode.
116
Bargraph indicator over
Mid Bargraph. Display
shows measurement
value. No R, L, W, or P
visible. (Set point type
local only.) Auto mode.
FIC
52791
144.2
Bargraph indicator in
Position 4 (no indicator).
Display shows totalizer
value. No R, L, W, or P
visible. (Set point type
local only.) Auto mode.
70.6
A
FIC
A
FIC
A
Bargraph indicator over
Right Bargraph. Display
shows output value in
percent. No R, L, W, or P
visible. (Set point type
local only.) Auto mode.
FIC
70.6
M
Bargraph indicator over
Mid Bargraph. Display
shows measurement
value. No R, L, W, or P
visible. (Set point type
local only.) Manual mode.
M
Bargraph indicator over
Right Bargraph. Display
shows output value in
percent. No R, L, W, or P
visible. (Set point type
local only.) Manual mode.
5. Operation
MI 018-885 – August 2018
Figure 69. Faceplate Displays When Configured for Workstation/Panel and Local/Remote Set Point
and Totalizer
FIC
FIC
FIC
140.0
144.2
70.6
P
P
P
L
L
L
A
Local set point and panel
mode. Indicator over left
bargraph. Display and left
bargraph show local set point
value. Auto mode. When in
remote mode, faceplate is the
same except that R replaces L
and display and left bargraph
shows remote set point value.
A
Local set point and panel
mode. Indicator over mid
bargraph. Display shows
measurement value. Auto
mode. When in remote
mode, faceplate is the
same except that R
replaces L and display and
left bargraph shows
remote set point value.
A
Local set point and panel
mode. Indicator over right
bargraph. Display shows
output value in percent.
Auto mode. When in
remote mode, faceplate is
the same except that R
replaces L and display and
left bargraph shows
remote set point value.
FIC
FIC
FIC
165.0
144.2
48132
P
L
A
Local set point and panel
mode. Indicator in Position
4 (no indicator). Left
bargraph shows local set
point. Display shows
remote set point value. Auto
mode.
P
P
R
R
A
A
Remote set point and panel
mode. Indicator in Position 4
(no indicator). Left bargraph
shows remote set point.
Display shows local set point
value. Auto mode.
Remote set point and
panel mode. Indicator in
Position 5 (no indicator).
Display shows totalizer
value. Auto mode.
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5. Operation
Changing the Control Status
To switch between Auto and Manual modes, press the A/M key. To switch between Remote and
Local set points or between Ratio and Local modes, press the R/L key. For these keys to be active,
their respective switches must be configured to NONE. Also, if serial communications are
enabled, W/P must be configured to P.
To switch between Workstation and Panel operation, press the W/P key. For this key to be active,
W/P must be configured ON and W/P PRIORITY must be set to P or BOTH.
All transfers except R/L are bumpless. R/L transfer is bumpless if LOCTRK is set. A/M, R/L, and
W/P can be switched remotely via respective switches.
NOTE
When the controller is placed in Manual, the bargraph indicator moves over the right
bargraph (output). When placed in Auto, it moves over the middle bargraph
(measurement).
Changing Set Point, Output, and Variables
To increase or decrease local set point:
1. With controller in local mode, press SEL to select the bargraph display. If the
indicator is not over the Left Bargraph, press SEL repeatedly until it is positioned over
the Left Bargraph.
2. Press the /keys to change the value. To increase the rate of change in the value,
press/hold the key.
Table 22 describes how the arrow keys affect controller variables with different positions of the
bargraph indicator in both automatic and manual modes, when R/L is not configured.
Table 23 on page 119 defines similar functions when R/L and a totalizer are configured.
Table 24 on page 120 defines operation in ratio mode.
Table 22. Effect of / Keys with R/L Not Configured
Auto/Manual
Status
Auto
Manual
Indicator
Above Bargraph
Any Bargraph
Variable Adjusted by
/ Keys
Comments
Set Point
Set Point
Set Point
Output will not change.
Measurement
Output
Set point will not change
Output
Output
Set point will not change
When the unit is configured for the Remote/Local set point function and you have selected remote
set point operation, you can use the / keys to adjust the local set point and the output, subject
to certain restrictions. The restrictions are described in Table 23.
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5. Operation
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Table 23. Operation of Remote/Local Controller with Totalizer
Status Setting
A/M
A
M
R/L
Identifier Above
Contents of Lower
Digital Display
Variable Adjusted by
/ Keys
R
Set Point (a)
Measurement
Output
No Indicator (a)
No Indicator (a) (b)
Remote Set Point
Measurement
Output
Local Set Point
Totalizer
No Adjustment
No Adjustment
No Adjustment
Local Set Point
No Adjustment
L
Set Point (c)
Measurement
Output
No Indicator (c)
No Indicator (b) (c)
Local Set Point
Measurement
Output
Remote Set Point
Totalizer
Local Set Point
Local Set Point
Local Set Point
No Adjustment
No Adjustment
R
Set Point (a)
Measurement
Output
No Indicator (a)
No Indicator (a) (b)
Remote Set Point
Measurement
Output
Local Set Point
Totalizer
No Adjustment
Output
Output
Local Set Point
No Adjustment
L
Set Point (c)
Measurement
Output
No Indicator (b)
No Indicator (b) (c)
Local Set Point
Measurement
Output
Remote Set Point
Totalizer
Local Set Point
Output
Output
No Adjustment
No Adjustment
a. Set point indicator shows remote set point.
b. This position is present only if a totalizer is configured.
c. Set point indicator shows local set point.
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5. Operation
When the unit is configured for the Ratio/Local function and you have selected ratio operation,
you can use the /arrow keys to adjust the local set point, output, and ratio gain, subject to
certain restrictions. The restrictions are described in Table 24.
Table 24. Operation of Ratio Controller with Totalizer
Status Setting
A/M
A
M
a.
b.
c.
d.
e.
R/L
Bargraph Identifier
Position
Contents of Lower
Digital Display
Variable Adjusted by
/ Keys
R (Ratio)
Set Point (a)
Measurement
Output
No Indicator (a)
No Indicator (b)
Ratioed Variable (c)
Measurement
Output
Ratio Gain
Totalizer
Ratio Gain (d)
Ratio Gain (d)
Ratio Gain (d)
Ratio Gain (d)
No Adjustment
L (Local)
Set Point (e)
Measurement
Output
No Indicator (e)
No Indicator (b)
Local Set Point
Measurement
Output
Ratioed Variable (c)
Totalizer
Local Set Point
Local Set Point
Local Set Point
Ratio Gain
No Adjustment
R (Ratio)
Set Point (a)
Measurement
Output
No Indicator (a)
No Indicator (b)
Ratioed Variable (c)
Measurement
Output
Ratio Gain
Totalizer
Ratio Gain (d)
Output
Output
Ratio Gain (d)
No Adjustment
L (Local)
Set Point (e)
Measurement
Output
No Indicator (e)
No Indicator (b)
Local Set Point
Measurement
Output
Ratioed Variable (c)
Totalizer
Local Set Point
Output
Output
Ratio Gain (d)
No Adjustment
Set point bargraph shows ratioed variable.
This position is present only if a totalizer is configured.
Ratioed Variable is product of the ratio signal, ratio gain, and range.
If ratio is sourced to faceplate and ratio gain is not cascaded from controller output.
Set point bargraph shows local set point.
Displaying/Acknowledging Alarms
Alarm information (horn symbol alarm indicator) is displayed regardless of which faceplate is in
use. If the unit is so configured, alarm points can be displayed in the bargraphs. Typical displays
for an absolute measurement high/low alarm with alarm levels indicated are shown in Figure 70.
High/High and Low/Low Alarms
Displays for high/high and low/low types of alarms are similar to those illustrated for a high/low
alarm except for different placement of the alarm points. With rate-of-change alarms, however, no
indication appears on the bargraphs. When a rate-of-change alarm is active, only the alarm
indicator on the faceplate flashes. When you press the ACK key to acknowledge the alarm, the
Lower Digital Display shows the status of the latest active alarm. By pressing ACK repeatedly, you
can cycle through the status of all alarms and the current value of the selected variable.
Latching Alarms
If a latching alarm condition occurs, the alarm indicator flashes until you press the ACK key. At
this point, the alarm indicator goes out if the alarm condition has ended. If the condition persists,
it changes from flashing to steady. The steady alarm indication continues as long as the alarm
condition exists.
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5. Operation
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Non-latching Alarms
If a nonlatching alarm condition occurs, the alarm indicator flashes until you press the ACK key or
the alarm condition ends. When the alarm is acknowledged, the alarm indicator stops flashing
and becomes steady. When the alarm condition ends, the alarm indicator goes out.
Acknowledging Alarms
After you acknowledge an alarm, the condition causing the alarm is identified by a flashing
message in the lower line of the alphanumeric display. The message continues to flash as long as
the alarm condition exists, or until you press the ACK key again. When you press the ACK key a
second time, the message disappears and the value of the previously selected bargraph is again
displayed.
Multiple Alarms
If more than one alarm condition exists, you can identify each condition in turn by pressing the
ACK key repeatedly. After all active alarm conditions have been identified, the previously selected
bargraph value is displayed. The alarm indicator, however, continues to be illuminated. You can
again display the identifications of the alarm conditions by repeatedly pressing the ACK key. If an
alarm condition no longer exists, it is removed from the alarm queue.
Audible Warning
Alarms may be assigned to one or two contact outputs to drive a horn bus. With a latching alarm,
the alarm contact output resets when the alarm condition is ACKnowledged and the alarm
condition returns to normal. With a nonlatching alarm, the alarm contact resets when the alarm
condition is ACKnowledged or the alarm condition returns to normal, whichever is first. With a
permissive alarm, no visual indication is provided. However, the alarm contact is active.
In addition to connecting to a contact output, the boolean output of the alarm, can be used
anywhere any other signal in the Gate Input List can be used.
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5. Operation
Figure 70. Alarm Displays, High Alarm on Absolute Measurement (Level 1, Latched)
NORMAL OPERATION
FIC 1002A
150.5
GPM
Bargraph indicator
High Alarm Point
Output
Measurement
Set Point
Low Alarm Point
ACTIVE HIGH ALARM
FIC 1002A
181.0
GPM
Flashes
Measurement
High Alarm Point
Low Alarm Point
Flashes until acknowledged
ACKNOWLEDGED
FIC 1002A
ALARM 1
Measurement
Set Point
L1
DISPLAY FIRST SHOWS STATUS OF
LATEST ACTIVE ALARM. PRESS ACK TO
CYCLE THROUGH STATUS OF ALL ALARMS
AND CURRENT VALUE OF SELECTED
VARIABLE. ALARM 1, LEVEL 1 TRIGGERED
THE ALARM ACTIVITY SHOWN.
Flashes
High Alarm Point
Low Alarm Point
Steady
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Changing Alarm Settings
If you are authorized to do so, you can increase and decrease alarm settings from OPTUNE (Refer
to the Structure Diagram on page 221). You can also do this from ALLTUNE if you have entered
the passcode.
To change the alarm setting for Alarm 1 Level 2, refer to Structure Diagram shown on page 221
and execute the following procedure:
1. Starting in NORMAL mode, press TAG to go to READ, then  to go to SET mode.
2. If not configured for alarms to be present in OPTUNE, press  to go to SECURE.
Then press ACK to display PASSCODE =?. Enter passcode and press ACK to move
to ALLTUNE. Go to Step 4.
3. Press ACK to go to OPTUNE, if configured for alarms to be present in OPTUNE.
4. Press ACK to go to TUNE C1.
5. Press  repeatedly until display shows ALARMS.
6. Press ACK to go to ALARM 1.
7. Press ACK to go to LEVEL 1 =?.
8. Press / keys to adjust LEVEL 1. Press ACK to enter setting.
9. Press ACK to go to ALARM 1 LEVEL 2. The lower display will show the current
setting for ALARM 1 LEVEL 2.
10. Press / keys to increase or decrease the LEVEL 2 setting. When desired value is
displayed, press ACK to accept the setting.
11. Press ACK to go to ALARM DEADBAND.
12. Press / keys to increase or decrease deadband. Press ACK to enter setting.
13. Press TAG to return to NORMAL operation.
Enabling/Disabling EXACT Tuning
EXACT adaptive tuning is described in detail in Chapter 6, “EXACT Tuning”. If the unit is so
configured, you can enable or disable the function.
To enable or disable EXACT self-tune mode, execute the procedure illustrated in the flow
diagram of Figure 71. The EXACT switch must be configured NONE in order to gain access in
ALLTUNE.
The default configuration for the EXACT SWITCH parameter is “None” as shown in
Appendix B. With this configuration, EXACT is automatically turned off during power-up,
during a power interruption, and when exiting from the CONFIGURATION mode. To make
EXACT active at all times, set the EXACT SWITCH parameter to “On.” To control EXACT
from an external source, assign the EXACT SWITCH parameter to an external contact.
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Figure 71. Flow Diagram for Enabling/Disabling EXACT Tuning
NORMAL
TAG
READ
SET
ACK
OPTUNE
SECURE
TUNE C1
ACK
ACK (if authorized by SHOWOP)
ACK
Enter Passcode
ACK
PASSCODE
ALLTUNE
ACK
PF =
4 Times
EXACT
ACK
STATE
ACK
ON
OFF
ACK
ACK
TAG to
return to
NORMAL
Switching Faceplate Displays
If Controller Function 2 is configured, press/hold the SEL key to switch the display to Faceplate
#2. To switch back to Faceplate #1, press/hold SEL again.
Switching Modes
From the keypad, you can switch from NORMAL mode to READ mode by pressing TAG.
To switch from READ mode to SET mode, press the key.
To return to NORMAL mode at any time, press TAG.
Operation as an Auto/Manual Station
Either or both functions of the 762CNA can be configured as Auto/Manual Stations. When an
A/M Station is configured, operation is essentially the same as when a controller is configured,
except that no control algorithm is computed. This means that all features and configuration
options other than a control algorithm are available for use.
When in Auto mode, the output is equal to its configured source value. The measurement input is
then displayed on the middle bargraph and the output on the right bargraph. The left bargraph
displays an assigned value, if configured. Use the SEL key to view the value on the lower digital
display. The factory default is a blanked bargraph.
In Manual mode, the output is determined by use of the / keys as in a controller. If dual
functions are configured, use the “Switching Faceplate Displays” procedure described on the
previous page.
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Operation as a 3-Variable Indicator Station
Either or both functions of the 762CNA can be configured as 3-variable indicators. When a 3variable indicator, sometimes called a 3-bar indicator, is configured, the faceplate display is as
shown in Figure 72.
Figure 72. 3-Variable Indicator Station (Faceplate 1 or 2)
Upper digital display
Lower digital display
FI I03A
I50.5 GPM
Overrange indicator
Indicator (Normally
not visible)
Bargraph indicator
Overrange indicator
Workstation/Panel
Status
P
Left Bargraph
Mid Bargraph
Right Bargraph
Alarm Indicator
Underrange indicator
Keypad
W/P
R/L
A/M
SEL
TAG
ACK
In a 3-variable indicator, the Upper Digital Display shows the loop tag identification of the
variable being displayed in the Lower Digital Display and the selected bargraph. As you move the
bargraph indicator to the next bargraph by pressing the SEL key, the loop tag and displayed value
change accordingly.
Since A/M and R/L functions are not applicable, the symbols do not appear on the faceplate and
the associated keys are not operative. The WP symbols and the W/P key are operative only if
configured. Depending on the setting, either W or P appears on the faceplate.
Since the bargraphs display the present values of their associated variables, the values cannot be
adjusted with the / keys. Operating procedures for alarms are the same as when a controller is
configured.
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Operation as an Auto-Selector Station
When the unit is configured as a single-station auto-selector, two controllers alternately control a
single output. Control shifts smoothly from one to the other depending on how the loops are
configured and operated. Selection can be high select, low select, or event-driven (via GATE 4).
Feedback from the output is provided to help prevent windup in the controller that is currently
not selected for control.
When viewing the faceplate of the unselected controller, the operator sees a flashing AM indicator.
Operation as a Cascade Control Station
When the unit is configured as a single-station cascade control station, Controller 1 is configured
as the primary controller and Controller 2 is the secondary or slave controller. The output of
Controller 1, therefore, is used as the remote set point or ratio gain for Controller 2. The output
of Controller 2 controls the valve or other actuator.
The AM status indicator flashes to indicate an open loop condition in a cascade primary loop
when the secondary is in Manual, Local, or OUTTRK.
Totalizer Operation
As described earlier in this chapter, you can observe the present value of a totalizer by pressing
SEL to move the bargraph indicator to a position in which the value is displayed on the Lower
Digital Display. (This is the fourth or fifth press of the SEL key, depending on whether or not the
fourth position is used to display an inactive set point.)
To observe the preset value or current value of the totalizer, enter the READ mode by pressing
TAG. Then use the Structure Diagrams and the keypad to move to PRESETn, where you can
read the preset value or to TOTALn, where you can read the current value. The sequence is
illustrated in Figure 73.
If you want to change the state of a totalizer (RESET, HOLD, COUNT), adjust the totalizer
value or preset value, and you are authorized to do so, use the OPTUNE or ALLTUNE mode.
Procedures for moving around in the product structure using the keypad and Structure Diagrams
are described in Chapter 4, “Configuration”.
Figure 73. Reading the Value of Totalizer Preset
TAG
NORMAL
READ
ACK
VALUES
ACK
INPUTS
(2 times)
ACK
TOTALS
TOTAL1=
NOTE:
TO RETURN TO NORMAL,
PRESS TAG AT ANY TIME.
PRESET1
TOTAL2=
PRESET2
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READ Mode Operation
In the READ mode, you can display process parameters, and if access is allowed via SHOWOP
RD CFG, the configuration. Figure 74 is a flow diagram that shows how to read the various
parameters and values.
Figure 74. Structure Diagram for READ Mode Functions
NORMAL
TAG
READ
ACK
VALUES
ACK
ACK
IN1 =
INPUTS
ACK
F2 =
CONFIG
VERSION
ACK
SIGNALS
TOTALS
ACK A-F, AOUT 1,
AOUT 2, C1 OUT,
C2 OUT, CALC 1,
ACK CALC 2,CALC
3
CALC 3 =
ACK
ACK
TOTAL1 =
TOTAL2 =
PRESET 2
ACK
CONSTS
NOTE:
ITEMS APPEAR ONLY IF
CONFIGURED. OTHERWISE,
THEY ARE SKIPPED.
CONTACTS
ACK
NOTE:
TO RETURN TO NORMAL,
PRESS TAG AT ANY TIME.
ACK
ACK
CI 1, CI 2,
CO1, CO2
ACK
GATE 1-9
ACK
ALARM 1
ALARM 4
LIMITS
ACK
G-J
ACK
GATE 0 =
GATE 9 =
ACK
ACK
CI 1 =
CO 2 =
ACK
ACK
G=
J=
ALARMS
ACK
A=
PRESET 1
GATES
IN1, IN2, IN3,
IN4, FI, F2
ACK
LEVEL 1 =
LEVEL 2 =
ACK
DB =
ACK
CI SPHL
CI SPHL=
C2 OUTLL
ACK
C2 OUTLL =
C1 SPHL,
C1 SPLL,
C1 OUTHL,
C1 OUTLL,
C2 SPHL,
C2 SPLL,
C2 OUTHL,
C2 OUTLL
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5. Operation
6. EXACT Tuning
This chapter describes the EXACT adaptive tuning system, a feature of the 762CNA controller.
The chapter is divided into the following major sections:
 “Technical Description”
 “Using EXACT Tuning with 762C Controllers”
 “Tutorial Example”
 “EXACT Parameter Tables”
Technical Description
EXACT (EXpert Adaptive Controller Tuning) is a patented mechanism for automatically
adjusting controller parameters to maintain optimal control of your process at all times. EXACT
is more efficient than manual tuning and provides a means of managing processes that are
otherwise difficult to control. In addition, a “pretune” feature permits you to achieve optimal
settings of six key parameters quickly even when initial values vary widely from the target.
Benefits of EXACT Tuning
Benefits of using EXACT tuning are:
 Accelerates process startup
 Optimizes controller tuning in the presence of noise, variable dynamics, process
nonlinearities, deadtime, set-point changes, and load variations
 Matches tuning to current operating conditions
 Frees skilled personnel to do other tasks
 Reduces operating expenses through more efficient process control.
 Does not require a mathematical model of your process
The EXACT algorithm determines the response of your particular process to an upset — a change
in load or set point — and calculates new tuning parameters automatically. This technique closely
emulates the actions an expert control engineer takes in tuning a controller. EXACT tuning,
however, checks the process five times every second, 24 hours a day, to determine whether a
parameter change should be made.
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6. EXACT Tuning
EXACT Steps
The basic steps performed by an EXACT controller are:
1. Wait for a significant process upset (magnitude greater than twice the noise level).
2. Determine the actual response of the process to the upset.
3. Calculate optimal values of P, I, and D, using the STUN self-tune algorithm.
4. Return to normal operation, using the new values.
The EXACT algorithm has 18 numeric parameters, of which eight can be set by the user. The
remaining ten are determined by the process itself and are, therefore, continually updated.
Initially, the eight user-adjustable parameters are set at factory defaults, which represent safe,
general purpose values.
Even if the values of key parameters are unknown or the default values are wrong for your process,
you can calculate new values automatically, using the EXACT pretune feature. The pretune
procedure, using the PTUN algorithm, starts with the factory-set defaults and calculates
optimum values of the six parameters by determining the response of the process to an
intentionally introduced process upset, called a “bump.” The magnitude of the bump is useradjustable.
Determining Process Response (Pattern Recognition)
The pattern to be recognized by the EXACT algorithm is the variation of error versus time, where
the detected error is defined as the difference between measurement and set point. The general
goal, which is to minimize error, may be defined in various ways. For some processes, the goal is
to minimize the peak magnitude of error (overshoot). For others, it is to achieve maximum
reduction of successive error peaks (damping). For others, it is to reduce steady-state error to zero
in the shortest possible time. The various goals are defined by the terms overshoot, damping, and
period.
Figure 75. Pattern Recognition Characteristics
E1
E1
Error
+
-
E3
Time
E2
Error
Load Change
Set Point Change
+
-
Period (T)
E3
Time
E2
Overshoot = E2/E1
Damping = (E3-E2)/(E1-E2)
The EXACT pattern recognition approach is unique — its algorithm does not require a
mathematical model of the process. (1),(2),(3) Instead, it uses direct feedback of actual process
performance to determine the action required.
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The self-tuning PID algorithm monitors the closed-loop recovery of the process following a
disturbance to set point or load. It then automatically calculates P, I, and D to minimize process
recovery time, subject to user-specified damping and overshoot limits.
For most processes, however, damping and overshoot are not independent; the period of
oscillation must be included to define the shape of the pattern. The period can be
nondimensionalized by using the controller I and D values to produce ratios similar to those
proposed by Ziegler-Nichols (1) and Shinskey (2). The ratios I/period and D/period define the lead
and lag phase angles of the controller response. P, I, and D computations are therefore based upon
the period of oscillation and are constrained by the user-set damping and overshoot parameters
(see Figure 75).
Calculating PID Values (STUN Algorithm)
Figure 76 is a state diagram of the EXACT self-tune algorithm, called STUN. The current status
of the control process is shown on the two-line display on the face of the 762CNA controller. If
corrective action is currently being taken, you can display either the reason the current step is
being implemented, or the name of the last corrective step completed.
1. Rohrs, C. E., Valavani, L., Athans, M., and Stein, G., “Robustness of Adaptive Control Algorithms
in the Presence of Unmodeled Dynamics,” MIT Industrial Liaison Program, Publication No. 01-016,
1983.
2. Fjeld, M. and Wilhelm, R. G., Jr., “Self-Tuning Regulators - The Software Way,” Control
Engineering, November 1981, P. 99.
3. Clarke, D. W., “The Application of Self-Tuning Control,” Trans Inst MC Vol. 5. No. 2, April-June
1983, P. 59.
1. Ziegler, J. G. and Nichols, N. B., “Optimum Settings for Automatic Controllers”, Trans ASME,
November 1942.
2. Shinskey, F. G., Process Control Systems, McGraw-Hill, New York, NY, 2nd Edition, 1979, pp. 9699.
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6. EXACT Tuning
Figure 76. STUN Algorithm State Diagram
Third peak found
Verify 3
Locate 3
Verify 2
Third peak not found
Third peak not found
Adapt
Locate 2
Verify 1
Second peak not found
Second peak not found
Locate 1
Quiet
Settle
Locating Peak 1
In normal operation, set point and measurement are close to each other and the algorithm is in
the QUIET state (detected error is too small to activate the self-tune algorithm). However, when a
disturbance appears in the process that causes the error to exceed twice the noise band, the
algorithm “wakes up” and begins to “watch” the error in anticipation of a peak. While waiting for
the first peak, the state is defined as LOCATE 1. Once a peak occurs, the algorithm stores the
magnitude of the peak and starts a timer to record the elapsed time to the next peak, which is
defined as the period of oscillation.
Ziegler-Nichols Method
Ziegler-Nichols developed a tuning procedure that involved adjusting I and D until I/period
equals 0.5 and D/period equals 0.12. However, it has since been found that much better tuning
and quicker convergence result when the ratios of I/period and D/period are changed by the
algorithm. A process with a dominant deadtime requires smaller ratio values than one with a
dominant lag. If the response is overdamped and distinct peaks are not found, I and D are
adjusted by applying expert rules.
Verifying Peak 1
Before searching for Peak 2, the algorithm verifies that the first is a true peak (during the
VERIFY 1 state). If a new extreme value occurs during this verification state, it then becomes the
first peak and the timer is restarted.
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Locating Peaks 2 and 3
After Peak 1 occurs and is verified, the algorithm uses the same method to locate and verify Peaks
2 and 3.
Damping, Overshoot, and Period
The peak information is then expressed in the previously-defined terms of “overshoot”,
“damping”, “I/period”, and “D/period.” Validity is determined for this information based upon
the height of the peaks relative to the nominal noise band and the time between peaks relative to
the period of a nominal damped sinusoid.
When the loop is properly tuned, the values of P, I, and D remain essentially unchanged from
disturbance to disturbance. However, if the disturbance changes shape or if the process changes,
EXACT will automatically determine new values.
Calculating P, I, D
Up to this point, the controller is operating as a fixed parameter PID controller. However, it has
observed the loop response to a disturbance. The algorithm then uses the response information to
calculate new values of P, I, and D (during the ADAPT state). The first step in calculating new P,
I, and D values uses the period information to set I and D directly and damping or overshoot
error to adjust P. The interaction between P, I, and D, however, requires this algorithm to be
slightly more sophisticated — P must be further adjusted to compensate for the changes in I and
D values.
Settling State
The self-tuning cycle is complete when the newly calculated P, I, and D values are set into the
controller. The algorithm then goes through a settling state that allows a smooth transition into
locating a new first peak, if necessary. The SETTLE state is only used to help assure that the next
peak found is a true peak. Switching the controller from MANUAL to AUTO or initially
activating the self-tuning feature forces the algorithm into the SETTLE state.
Calculating Initial Parameters (PTUN Algorithm)
If the control characteristics of the process are not known, optimum values for six key parameters
(PF, IF, DF, NB, WMAX, and DFCT) can be calculated by the pretune (PTUN) algorithm.
Before enabling this feature, however, the controller must be in MANUAL, with the
measurement steady and near the set point.
Introducing Process Upset
PTUN uses the factory-set (or user-adjusted) values of these six parameters as the starting values.
The mechanism of the pretune function is to introduce a small process upset (output change) and
determine the response of the process to this upset. The resultant process reaction curve provides
data for the PTUN algorithm to calculate optimum values of the six parameters. The size of the
process upset is provided by a parameter called BUMP.
After the procedure is finished, these optimum values are entered into the memory of the
controller. In this way, the self-tune algorithm then starts with more correct values of P, I, and D,
and thus, the measurement is stabilized faster. (PTUN-calculated values of PF, IF, and DF are the
initial values of P, I, and D for the STUN algorithm.)
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Computing IF, DF, WMAX
A typical process reaction curve (see Figure 77) identifies the effective process dead time and
process sensitivity. The estimate of dead time is used to determine integral time (IF), derivative
time (DF), and the maximum wait time (WMAX).
Figure 77. Typical Process Response to Step Change in Controller Output
Measurement
Process Sensitivity
Time
Td = Effective Dead Time
Computing PF, NB, DFCT
The proportional band (PF), integral time (IF), derivative time (DF), and wait time (WMAX) are
calculated from both the sensitivity of the process reaction curve and the dead time. The nominal
noise band (NB) is determined by observing the measurement and estimating the peak-to-peak
amplitude that is of higher frequency content than the closed loop can remove. If the noise
content is high, the derivative factor (DFCT) is reduced, since derivative action is not effective in
a high noise environment. Usually DFCT is set to 1.
4 Pretune Phases
The four main phases of pretune are shown in Figure 78. As they occur, they are shown on the
display of the controller. The process upset occurs with a step change in controller output at point
1. The algorithm waits for steady state during 2 (the messages PTUN = SMALL 1 and PTUN =
WAIT 2 will be displayed), calculates the control parameters, and returns the controller output to
its starting value at point 3 (PTUN = PID 3). If the process is an integrating type or if it has high
gain, point 3 is reached when the measurement changes by 10% of its span or the bump size,
whichever is larger. Finally, the noise band and derivative factor are calculated during 4 (PTUN =
NB 4). When the process is completed, the message PTUN = FINISH will appear.
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Measurement
Figure 78. Pretune States
3
2
1
4
Time
User-adjustable Parameters
In configuring a 762CNA controller, you can leave any of the user-adjustable parameters at the
factory-set values, change them to new values, or use the pretune function (PTUN) to calculate
optimum settings of six key user-set parameters (PF, IF, DF, NB, WMAX, and DFCT). Factoryset default values and acceptable maximum and minimum values for each parameter are listed in
Table 30, “EXACT Parameter Limits and Values,” on page 146.
Initial Values of P, I, and D (PF, IF, and DF)
The PF, IF, and DF parameters are the PID values used by the controller when EXACT tuning is
either not configured or not enabled. They also are the starting values for P, I, and D used by the
self-tune algorithm, STUN.
If you have little or no knowledge of the PID values required for your process and choose not to
run PRETUNE, you can start with the factory-set values. EXACT eventually corrects any
unreasonable initial values.
Noise Band (NB)
Virtually every process measurement has the potential of being “noisy.” The term, noise, is used
because the measurement data contains no information useful for loop tuning. To avoid an
attempt to extract tuning information when none is present, the self-tune algorithm must know
the peak-to-peak magnitude of this noise. Self-tuning begins whenever the error exceeds twice the
noise band. The magnitude of the noise band is also used by the self-tune algorithm to determine
whether or not an observed peak is noise.
Derivative Factor (DFCT)
In some processes, such as those with large dead time or high measurement noise, derivative
action is not beneficial. In others, it is very helpful.
The DFCT Derivative Factor provides a mechanism for you to attenuate or amplify the influence
of derivative to period ratio. By varying this factor, you can change the value of the adapted
derivative term. Setting this factor to 0.0 transforms the controller into a PI controller; setting it
to 1.0 produces normal derivative action. For processes that require a large amount of derivative
action (such as a double integral process), DFCT can be increased to as much as 4.0.
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Maximum Wait Time (WMAX)
The self-tune algorithm requires an estimate of the time scale of the process. This parameter
defines the maximum time that the algorithm waits for the second peak before deciding the
response is non-oscillatory (see Figure 79). WMAX should be set greater than half the maximum
period of oscillation T (refer to Figure 80) and less than eight times the minimum period of
oscillation T, or T/2 <WMAX< 8T.
ERROR
Figure 79. Maximum Wait Time (WMAX)
WMAX
TIME
Figure 80. Period of Oscillation (T)
ERROR
T/2 < WMAX < 8T
T
TIME
Change Limit (CLM)
You may want to limit the maximum and minimum values of P and I calculated by EXACT. The
CLM parameter is the factor by which PF and IF are multiplied and divided to set these limits.
Division is used to set the lower limit; multiplication for the upper limit. For example, if PF
equals 100 and CLM equals 4, P calculated by EXACT will be limited to values between 25 and
400%.
Output Cycling Limit (LIM)
EXACT monitors the controller output when it is oscillating at a frequency higher than that to
which the loop can respond. If the average peak-to-peak amplitude exceeds LIM for over three
minutes, the controller is automatically detuned by increasing P and reducing D. This feature is
useful for processes that have very little dead time and that require a high controller gain. For this
type of process, the value of LIM should be reduced.
Target Damping (DMP) and Overshoot (OVR)
Since neither damping nor overshoot can generally be set independently, the algorithm uses the
larger deviation from target. Generally, damping minus its target is the greater since the overshoot
target is usually chosen as 50%, while the damping target is usually 10% to 20%. See Figure 81.
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Figure 81. Damping and Overshoot
ERROR
E1
OVR =
DMP =
E3
E2
E2
E1
E3-E2
E1-E2
TIME
BUMP Parameter
The PTUN function uses the BUMP parameter to introduce a small process upset for generating
data for input to STUN. The value entered determines the magnitude and direction of the upset.
The BUMP value, however, should not be so large that it drives the output off scale. For example,
if the output is at 6% of scale, with the measurement steady and near the set point, a BUMP value
of -8% would drive the output off scale (to -2%). Therefore, its value is automatically decreased
to -6%. If the BUMP value is too small to activate the pretune algorithm, the error message
PTUN = SMALL 1 will not disappear. In this case, the BUMP should be increased and PTUN
rerun.
Using EXACT Tuning with 762C Controllers
Table 29, “EXACT Parameters,” on page 145 defines the parameters used by EXACT. Table 30,
“EXACT Parameter Limits and Values,” on page 146 defines limits and default values for each. In
both tables, the parameters are listed in the same sequence in which they appear in the display.
Use of Structure Diagrams
Structure diagrams illustrate graphically the sequence in which displays appear on the face of the
762CNA controller as you press various keys. A structure diagram is a map of the product
structure that enables you to move easily from one parameter or display to another.
To enter the structure from normal operating mode, press TAG. You can then move around
within the structure by using ACK, SEL, and the keys. To leave the structure and return to
normal operation, press TAG at any time.
While you are in the structure (after pressing TAG), use ACK to accept a displayed value or to
move to the right or to the next item in the diagram. Use SEL to step to the left or backward in
minor increments. Use the keys to display a different value in a sequence or to move directly
up or down to a different location in the structure. Key functions are described in more detail in
Table 25.
Figure 82, which is an excerpt from Structure Diagram 4 (see page 221), shows the part of the
762CNA configuration sequence that pertains to EXACT.
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6. EXACT Tuning
Keys Used with EXACT
Table 25. Keys Used with EXACT
Key
Function
TAG
Press to move from normal operation to the product structure. When in the
product structure, press TAG to return to normal operation.
ACK
Press to accept a displayed value or to move the next item in the structure (to
the right or down in the structure).

Press to increase the value displayed by one increment, to display the next
item in a series of items, or to move upward in the structure to the next item.
Press/hold to increase the rate of change of a value.

Press to decrease the value displayed by one increment, to display the next
item in a series of items, or to move down in the structure to the next item.
Press/hold to increase the rate of change of a value.
SEL
Press to move backward in the structure in minor increments.
Responding to a ? Prompt
If a question mark appears in the alphanumeric display (on the right side of the lower line), it
means that an additional user action or data entry is required.
When a question mark appears, you should perform one of the following:
 Press the ACK key to acknowledge that the parameter shown is the desired one.
 Press the  or  key to display a different parameter. Press again and again until
desired parameter is displayed. Then press ACK to accept the parameter.
 Press the  or  key to change the value. Press ACK to accept the value.
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Figure 82. Structure Diagram for EXACT
TAG
READ ?
SET ?
ACK OPTUNE
SECURE
TUNE C1
ACK (if configured in SHOWOP)
ACK
ACK
PASSCODE
ALLTUNE
ACK
PF
until EXACT appears.
• Repeat
•• (The sequence depends on how SHOWOP is configured.)
ACK
ACK
EXACT
ON
STATE
Use these to turn EXACT
(STUN) on or off. (Press
OFF
ACK to accept selection).
RD EXACT STATE
ENT
STUN
P
I
D
Use these to read status
and values of EXACT
PK 1
parameters.
PK 2
PK 3
TPK 1
TPK 2
TPK 3
ERR
USER SET
PTUNE
NB
WMAX
DMP
OVR
CLM
DFCT
LIM
BUMP
STATE
Use these to set
user-adjustable
EXACT parameters
Use these to turn PTUNE
on or off. (Press ACK to
accept selection.)
ON
OFF
RD PTUNE
Use this to read
PTUNE status messages
Configuring EXACT
You enter all EXACT parameters into controller memory by stepping the display through the
structure diagram to USER SET and then selecting/entering the values. To step the display to a
desired location in the structure diagram, repeatedly press either the ACK or / keys until the
desired message appears on the display, using the Structure Diagram as a map.
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6. EXACT Tuning
EXACT configuration consists of entering three Yes/No decisions and 8 numerical parameter
entries. The process itself determines 10 additional parameters.
In configuring EXACT, you must make the following decisions:
1. Should EXACT be configured into controller?
2. Should the operator be allowed to read values and status of parameters and change
those that are adjustable — without using security passcode?
3. Do you intend to use the PTUNE pre-tuning function to calculate initial parameter
values?
You must also enter values (or use the factory-set default values) for the following parameters:
NB (a)
Noise Band
WMAX (a)
Maximum waiting time for peaks
DMP
Damping
OVR
Overshoot
CLM
Clamp (sets limits for P and I influences)
DFCT (a)
Derivative factor
LIM
Cycling limit
BUMP
Magnitude and sign of PTUN upset
a. These values can be automatically determined by using PTUN.
Note that you can change any of the Yes/No decisions or the values of the 8 adjustable parameters
at any time.
Status Messages
When EXACT is configured and enabled, self-tuning occurs automatically whenever the
measurement deviates from the set point by an amount greater than twice the value of the noise
band (NB) parameter.
If you step the display to RD EXACT ENT during the STUN correction process, a status
message appears. The message shows the reason why a specific corrective action was taken. See
Table 28, “Messages – RD EXACT ENT,” on page 141 for a list of these messages.
If you step the display to RD EXACT STUN during the correction process, a different sequence
of messages will appear. Each message displays the status of the specific correction action currently
taking place. See Table 27 for a list of these messages.
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Messages — Read EXACT Pretune
Table 26. RD EXACT PTUNE
Display
Meaning
RD PTUNE
Specific step in operation of pretune function.
RD PTUNE = OFF
Pretune function has not been switched on.
RD PTUNE
= IN AUTO?
Pretune function is ready. Put controller in AUTO.
RD PTUNE
= SMALL 1
Phase 1. Small (<2.5%) change in measurement. (If message lasts
longer than twice process dead time, value of BUMP is too small.)
RD PTUNE
= WAIT 2
Phase 2. Waiting for steady state.
RD PTUNE
= PID 3
Phase 3. New values of P, I, and D calculated. Output is returned to initial
value.
RD PTUNE
= NB 4
Phase 4. Measured noise band.
RD PTUNE
= FINISH
Pretune function finished. Values of the 6 key EXACT parameters have
been calculated and put into memory.
RD PTUNE
= INC WRONG
Pretuning not completed because controller output action (INC/INC or
INC/DEC) is configured wrong.
RD PTUNE
= NOISE
Pretuning not completed because value of noise band (NB) is too small.
Messages — Read EXACT Self-tune
Table 27. RD EXACT STUN
Display
Meaning
RD EXACT STUN
Status of specific corrective action taking place.
STUN = QUIET
No corrective action is taking place (error is <2NB).
STUN = LOCATE
1, 2, or 3
A peak (1, 2, or 3) has been located.
STUN = VERIFY
1, 2, or 3
The located peak (1, 2, or 3) has been verified.
STUN = ADAPT
P, I, and/or D has been adjusted.
STUN = SETTLE
Waiting for next peak.
STUN = MANUAL
Self-tuning is operational, but controller is in MAN.
STUN = INACTIVE
EXACT is temporarily disabled due to a configured condition that
affects the closed-loop control.
Messages — Read EXACT Entries
Table 28. Messages – RD EXACT ENT
Display
Meaning
RD EXACT ENT
Reason why specific corrective action was taken. (This parameter is
updated every time P, I, and/or D is adjusted.)
ENT = 1 PEAK
Only one significant (with respect to noise band) peak was found.
Measurement is approximately critically damped.
ENT = 2 PEAKS
2 peaks found.
ENT = 3 PEAKS
3 peaks found. If peaks are significant, response period is used to
adjust proportional and derivative actions.
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6. EXACT Tuning
Table 28. Messages – RD EXACT ENT (Continued)
ENT = DAMPED
Error signal (measurement deviation from set point) was overdamped.
Response may appear overdamped if WMAX is set too low. If so,
algorithm will tighten control settings (decrease P and I, and increase
D). This can lead to instability.
ENT = SUSPECT
Error signal has suspicious shape that may be caused by multiple
disturbances. P, I, and/or D were slightly adjusted based on this
suspicious shape.
ENT = FAST
Error signal response occurred faster than expected, based on WMAX
time. No corrective action was taken. (If response was correct, WMAX
should be reduced to allow EXACT algorithm to operate; WMAX should
be smaller than 8 times minimum period of oscillation.)
ENT = SP CHANGE
A large set point change occurred after algorithm had located or
verified a peak. Additional corrective action did not occur because
algorithm went immediately into SETTLE (waiting for the next peak)
state. (“Large” set point change means value larger than peak being
observed.)
ENT = OOR
Error signal was observed but P, I, and/or D were not changed because
process was out of control range. (For example, measurement is low,
but output is already at high limit.)
ENT = CLAMPED
Algorithm attempted to change P and I to values larger than settings of
PF and IF modified by CLM. These values are set at CLM limits. (If
required, settings of PF, IF, or CLM can be changed.)
ENT = INIT
EXACT algorithm has been initialized. (This can occur when power is
turned on, or when first switching from MAN to AUTO.)
Tutorial Example
The following example describes the procedure for setting up and using EXACT tuning for
achieving optimal control of a process loop. Before starting, you should decide the following:
1. Do you want to use PTUN to generate initial parameter values?
2. If not, do you want to use factory default values for all parameters or do you want to
enter your own values? If you want to enter your own values, please have them ready
to enter when requested.
A flow chart of the functional steps in the procedure is illustrated in Figure 83. The detailed steps
of the procedure follow the general flow diagram.
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Figure 83. General Flow Diagram for Configuring EXACT
START
Turn EXACT OFF
Is EXACT OFF?
Yes
Using PTUN?
Yes
No
Planning
to use factory
defaults?
Place in MANUAL
Yes
No
Turn on PTUN
Enter
parameter
values
Place in AUTO
Bring MEAS No
and SET
close
MEAS and
SET close?
Yes
PTUN Done?
Turn on
EXACT
No
Yes
Place in MANUAL
Place in AUTO
DONE
NOTE
The following is intended only as an example of the use of EXACT and does not
include such items as configuring passcodes. Also, the example assumes that FUNC 1
is configured as an EXACT controller, TUNE C1 is present in the OPTUNE menu,
and Totalizer 2, although available, is disabled.
To configure EXACT for a typical control loop, execute the following procedure:
1. Is EXACT off? If yes, go to Step 2. If not, do the following:
a. From normal operation, press TAG to go to READ.
b. Press to go to SET.
c. Press ACK three times to go to PF.
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6. EXACT Tuning
d. Press three times to go to EXACT.
e. Press ACK to go to STATE.
f. Press ACK.
g. If OFF appears, press ACK to accept. If not, press to display OFF. Then press
ACK to accept.
h. The display will show RD EXACT.
i. Go to Step 2.
2. Are you planning to use PTUN? If not, go to Step 3. If yes, do the following:
a. Press repeatedly until the display shows PTUNE.
b. Press ACK to step to STATE ?
c. Press ACK again to step to STATE = ?
d. Press ACK. The current status is then displayed.
e. If ON, press ACK to accept the value. If OFF, press until PTUNE = ON
appears.
f. Press ACK to step to PTUN READ ?
g. Press ACK again to display RD PTUNE = ?
h. Press ACK repeatedly until IN AUTO appears.
i. Press A/M to accept. This places the controller in AUTO.
j.
The display will then show a sequence of status messages. When the message
PTUN = FINISH appears, press TAG to place the controller into MAN.
k. Go to Step 5.
3. Since you are not planning to use PTUN, you either have to enter new parameter
values or use the factory-set defaults. If you plan to use defaults, go to Step 5. If you
want to enter new values, go to Step 4.
4. To enter new parameter values, do the following:
a. Press TAG to step to READ.
b. Press  to move to SET.
c. Press ACK three times to move to PF.
d. Press  four times to move to EXACT.
e. Press ACK to move to STATE.
f. Press twice to move to USER SET.
g. Press ACK to step to NB?
h. Use the SEL key to select the digit to be changed. Use the  keys to change the
value of the digit.
i. Press ACK to accept value and move to the next digit.
j.
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When you have entered all digits correctly, press ACK to accept the value.
6. EXACT Tuning
MI 018-885 – August 2018
k. Press ACK to step to the next parameter. Execute the data entry steps for this
parameter and press ACK to move to the next.
l.
When you have entered all parameters, press TAG. Proceed to Step 5.
5. Verify that measurement and set point are close to each other and that the process is
stable. If not OK, wait before proceeding further. If the process is OK, turn EXACT
ON. To do this execute the following:
a. Step the display to EXACT STATE ?.
b. Press ACK to display STATE = _____.
c. If display shows STATE = ON, press ACK to accept. If display shows STATE =
OFF, press  until display shows STATE = ON.
d. Press ACK to accept.
e. Press TAG to place the controller in AUTO.
The controller is now in AUTO with EXACT enabled and operating in the STUN mode. To
observe the status of the STUN process, execute the following procedure:
1. Press TAG to move to READ.
2. Press  to move to SET.
3. Press ACK three times to move to PF.
4. Press  four times to move to EXACT.
5. Press ACK to move to STATE.
6. Press  to move to RD EXACT.
7. press ACK to move to STATE.
8. Press  twice to move to STUN.
9. Press ACK to display the current step (one of the messages shown in Table 27).
When the calculation process is complete, press TAG to return.
EXACT Parameter Tables
Table 29. EXACT Parameters
Parameter
Meaning
PF, IF, DF
Values of proportional, integral, and derivative actions that the controller
uses when EXACT tuning is not configured (or not enabled). These are also
used as initial values for P, I, and D, below.
EXACT STATE
Should EXACT tuning be enabled (ON or OFF)?
EXACT
The 18 parameters (below) that comprise EXACT algorithm.
P,
I,
D
Latest updated values of proportional, integral, and derivative actions that
the controller is using. (Original starting values came from MODES PF, IF,
and DF, above.)
PK1, PK2, PK3 Actual magnitudes of most recent series of error peaks. Error expressed as
amount of deviation of measurement from set point.
TPK1, TPK2,
TPK3
Actual time intervals between most recent series of error peaks (from upset
to Peak 1, Peak 1 to Peak 2, Peak 2 to Peak 3).
ERR
Error. Deviation of measurement from set point.
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6. EXACT Tuning
Table 29. EXACT Parameters (Continued)
Parameter
Meaning
NB
Noise Band. Error band (±) within which process will be controlled by last
values of P, I, and D. When the detected error exceeds 2xNB, corrective
action will start (EXACT starts to look for peaks).
WMAX
Maximum waiting time between Peak 1 and Peak 2.
DMP
Damping. Desired amount of damping of measurement signal.
OVR
Overshooting. Desired amount of measurement overshooting.
CLM
Clamp. Factor by which PF or IF values are either multiplied or divided by to
establish maximum and minimum EXACT values of P and I.
DFCT
Derivative Factor. Factor by which D is multiplied.
LIM
Limit. If output cycles for more than three minutes, controller is detuned by
increasing P and decreasing D.
BUMP
Bump (upset) value for pretuning (PTUN) function, expressed as ±% of
output.
RD EXACT
The status of the various affected parameters during corrective action.
RD EXACT ENT
Reason why specific action was taken. Ten messages are available; see
Table 27, “RD EXACT STUN,” on page 141.
RD EXACT STUN Self-tuning. Specific step just completed during corrective action. Eight
messages are available for 762CNA controller. See Table 27, “RD EXACT
STUN,” on page 141 for a detailed list.
EXACT PTUNE
Pretuning function. Method of obtaining initial values of six key EXACT
parameters, if details are not known about process.
PTUNE STATE
Should pretune function be enabled (ON or OFF)?
PTUNE
RD PTUNE
Specific pretuning step just completed. Nine messages are available; see
Table 26, “RD EXACT PTUNE,” on page 141.
Parameter Limits and Values
Table 30. EXACT Parameter Limits and Values
Parameter Limits
Parameter (a)
Min
Max
Default Value
PF
1%
8000%
200%
IF
0.01 min/rep
200 min/rep
2.00 min/rep
DF
0 min
100 min
0.0 min
ON
OFF
OFF
P
1%
8000%
(b)
User
Configuration
EXACT
EXACT STATE
EXACT
I
0.01
200 min
(b)
D
0
100 min
(b)
PK1
–102%
+102%
PK2
–102%
+102%
PK3
–102%
TPK1
146
+102%
<WMAX
TPK2
WMAX
TPK3
>WMAX
ERR
–102%
+102%
NB
0.5%
30%

|
|
Values are
determined
by process
|
|
|
|

6. EXACT Tuning
MI 018-885 – August 2018
Table 30. EXACT Parameter Limits and Values (Continued)
Parameter Limits
Parameter (a)
Min
Max
200 min
Default Value
WMAX
0.5 min
DMP
0.1
1
0.2
OVR
0
1
0.5
CLM
1.25
100
10
DFCT
0
4
1
LIM
2%
80%
80%
BUMP
-50%
+50%
8%
User
Configuration
5 minutes
RD EXACT
RD EXACT ENT
(10 messages)
INIT
(No Entry)
RD EXACT STUN
(11 messages)
MANUAL
(No Entry)
OFF
OFF
OFF (c)
(No Entry)
EXACT PTUNE
PTUNE STATE
ON or OFF
PTUNE RD PTUNE (9 Messages)
a. After EXACT is configured, specify the parameters listed above. These parameters can also be
specified in OPTUNE if the controller is so configured.
b. Starting values of P, I, and D are same as PF, IF, and DF (at top of table). EXACT will then continually
update these values.
c. PTUN STATE is normally OFF. When you start to use pretune function, you are prompted to turn it ON.
After function is completed, it automatically resets to OFF.
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6. EXACT Tuning
7. Calibration, Troubleshooting,
Maintenance
This chapter is divided into the following major sections:
 “Calibration”
 “Troubleshooting”
 “Maintenance”
Calibration
Frequency of Calibration
The inputs and outputs have been calibrated in the factory to an accuracy of ±0.1%. Normally
these functions do not require recalibration unless:
 Components have been changed.
 RTD or frequency (if present) measurement range has been changed.
 Controller configuration (in NOVRAM) was copied from another controller.
Calibration Equipment Accuracy
All calibration equipment (milliammeter, voltmeter, etc.) should have an accuracy of better than
±0.1%. If you use the measurement transmitter as the calibrating milliampere input signal source,
the transmitter must be in calibration.
Calibration Connections
The calibrating signal for current and voltage inputs (IN 1, IN 2, IN 3, IN 4) can be generated
internally in the controller or connected externally at the 32-pin terminal board at the rear of the
housing. RTD input and measurement of outputs (OUT 1 and OUT 2) are done at the 32-pin
terminal board.
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Calibration Procedures
NOTE
Calibration and a Display Test, contained within the product structure, are conducted
via the keypad on the front panel. To leave the Normal Operating mode to do these
functions and return to Normal Operation, press the TAG key. Use the and keys
to move the display up or down and the ACK key to move the display forward
horizontally in the product structure. Use the SEL key to move the display in minor
increments back through the product structure. The and  keys are also used to
adjust values that are shown on the lower alphanumeric display line. The digits are
entered from right to left. If a  or key is continuously pressed, numbers in the next
highest significant digit will change. Releasing and then pressing the key repeatedly
causes the numbers to change by one unit (in normal counting sequence) with each
depression.
Preliminary Procedures
Access the CONFIGuration or TEST parameter in the product structure using the TAG, , and
ACK keys on the front panel following Figure 84.
Use the and  and ACK keys and Figure 85 as you conduct calibration or display tests as
described in this section of your instruction.
Figure 84. Structure Diagram 1
Normal Operation
TAG
READ
ACK
SET
SET
OPTUNE
SET
SECURE
ACK PASSCODE ACK SECURE
ALLTUNE
SECURE
SHOWOP
SECURE
CONFIG
SECURE
CALIB
SECURE
TEST
150
Continued
on
Diagram 2
7. Calibration, Troubleshooting, Maintenance
MI 018-885 – August 2018
Figure 85. Structure Diagram 2
SECURE
CALIB
CALIB
INPUTS
INPUTS
ANALOG
ANALOG
INTERNAL
INTERNAL
ANALOG
EXTERNAL
EXTERNAL
IN 1 ZR
EXTERNAL
IN 1 FS
EXTERNAL
IN 2 ZR
EXTERNAL
IN 2 FS
EXTERNAL
IN 3 ZR
EXTERNAL
IN 3 FS
EXTERNAL
IN 4 ZR
EXTERNAL
IN 4 FS
INPUTS
FREQ
FREQ
F1
FREQ
F2
CALIB
OUTPUTS
OUTPUTS
OUT 1
OUTPUTS
OUT 2
SECURE
TEST
TEST
DISPLAY
F1
ZERO
ZERO
F1
FS
FS
F2
ZERO
ZERO
F2
FS
FS
OUT 1
ZERO
ZERO
OUT 1
FS
FS
OUT 2
ZERO
ZERO
OUT 2
FS
FS
888888888
888888888
Current or Voltage Inputs (IN 1, IN 2, IN 3, and IN 4)
The source of the calibrating signal (from either an internal or external source) determines if the
EXTERNAL or INTERNAL calibration is used.
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7. Calibration, Troubleshooting, Maintenance
INTERNAL Calibration
To perform an internal calibration, do the following:
Using the ACK key, move to INPUTS ANALOG and then to ANALOG
INTERNAL in the product structure. Calibration input signals (corresponding to
4 and 20 mA or 1 and 5 V) are generated internally. When the ACK key is pressed,
calibration is completed during an 8-second countdown for all four inputs (whether
used or not). Accuracy of the internal input signal is ±0.25% of span.
EXTERNAL Calibration
To perform an external calibration, do the following:
1. Connect an adjustable input source (4 to 20 mA or 1 to 5 V, as applicable) to
terminals of input being calibrated (Input 1, 2, 3, or 4) as shown in Figure 86.
NOTE
If the external calibrating signal is in error, the controller will still use this value as 0 or
100% input. However, if the signal error exceeds ±4.5%, an error message (TOO
HIGH or TOO LOW) will flash and the opportunity to recalibrate will be displayed
again.
2. Turn on controller power. Adjust input source to 4.000 mA or 1.000 V, as applicable
for 0% input signal.
Figure 86. Terminal Connections for External Current or Voltage Inputs
32-Position
Terminal Block
Input
Source
+
IN 1 +
IN 2 +
IN 3 +
IN 4 -
2
4
5
7
21
23
18
20
3. Using the ACK key, move to INPUTS ANALOG and then to ANALOG
INTERNAL. Using the  key, go to ANALOG EXTERNAL.
4. Using the ACK key to move to EXTERNAL IN 1 ZR.
5. Press ACK key to implement 0% input signal. A 8-second countdown will elapse to
allow controller to average input. IN 1 FS will now appear on lower line.
6. Adjust input source to 20.000 mA or 5.000 V, as applicable for 100% input signal.
7. Press ACK key to implement 100% input signal. A 8-second countdown will elapse to
allow controller to average input.
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8. Prompting on display for Input 2 (and then Inputs 3, and 4) is same as that for
Input 1. Complete this procedure for all four inputs.
RTD Input
This calibration procedure is similar to the EXTERNAL calibration in the preceding section,
except that the calibrating signals are resistances from a decade box and only applies to INPUT 1.
These resistances are applied to the terminals for absolute-temperature or for
temperature-difference calibration as shown in Figure 87.
Figure 87. Terminal Connections for RTD Input Calibration
Absolute Temp
Temp Difference
Ref
Meas
Decade Boxes
Terminal
Block
Terminal
Block
9
9
10
10
11
11
With absolute-temperature measurement, the resistances corresponding to 0 and 100% inputs can
be determined from the IEC 100 or SAMA 100 curve, whichever is applicable. With
temperature-difference measurement, the 0 and 100% resistances listed in the applicable curve
must be modified for use in the calibration procedure. This modification is required to minimize
detected errors due to the noncompensation of the measurement. See “Controller Range
Conversion” on page 155 for this modification.
If the temperature range is being changed, the jumpers and potentiometers on the RTD printed
wiring assembly (inside the controller) must be adjusted for the new range before calibrating the
input. See “Controller Range Conversion” on page 155.
Frequency Inputs (F1 and F2)
This calibration requires no external connections. The calibration is accomplished entirely from
the front panel keyboard.
1. Using the ACK and  keys, move to INPUTS FREQ in the product structure.
2. Using the ACK key, proceed to FREQ F 1 (for F 1 calibration) or the ACK and 
keys to proceed to FREQ F 2 (for F 2 calibration). Follow the prompting which is
summarized below.
3. Press ACK key. The lower display line shows ZERO ?. Press ACK key again and
ZERO will move to top line.
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7. Calibration, Troubleshooting, Maintenance
4. Note that the default value for F1and F2 ZERO is 0. Use and keys to enter on
lower display line frequency corresponding to 0% input. Press ACK key to implement
0% calibration.
5. The lower display line now shows FS (full scale). Press ACK key (FS will move to top
line). Note that the default value for F1 full scale is 2000 and for F2 full scale is 1000.
Use and keys to enter on lower display line frequency corresponding to 100% (full
scale) input. The maximum full-scale input is 9999 Hz. Press ACK key to implement
100% calibration.
6. If F 1 was just calibrated, F 2 will now appear on lower line. If F 2 is to be calibrated,
repeat procedure beginning with Step 3.
OUT 1 and OUT 2
1. If OUT 1 is being calibrated, connect a 0 to 20 mA milliammeter to terminals 26 and
27 on the 32-pin terminal block. If OUT 2 is being calibrated, connect a 0 to 20 mA
milliammeter or a 0 to 5 V dc voltmeter (as applicable) to terminals 8 and 6. See
Figure 88.
NOTE
If output does not calibrate, check jumper positions for 1-5 V dc or 4-20 mA. Refer to
“Positioning Links” on page 37.
Figure 88. Terminal Connections for Output Calibration
Terminal Block
+
26
OUT 1 27
+
OUT 2-
8
6
2. Using the ACK and keys, move to CALIB OUTPUTS in the product structure. If
OUT 1 is being calibrated, proceed to OUTPUTS OUT 1 by pressing the ACK key.
If OUT 2 is being calibrated, proceed to OUTPUTS OUT 2 with the ACK and 
keys. Follow display prompts as summarized below.
3. Press ACK key. The lower display line shows ZERO. Press ACK key again and ZERO
will move to upper display line. Use and keys to adjust meter reading to 0%
controller output. For OUT 1, reading should be 4.000 mA. For OUT 2, reading
should be 4.000 mA (4 to 20 mA output) or 1.000 V (1 to 5 V output). Press ACK
key to implement this value. FS (full scale) will appear on lower display line.
4. Use and keys to adjust meter reading to 100% controller output. For OUT 1,
reading should be 20.000 mA. For OUT 2, reading should be 20.000 mA (4 to 20
mA output) or 5.000 V (1 to 5 V output). Press ACK key to implement this value.
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Controller Range Conversion
Use the applicable procedures described below to change the input range of the controller.
Conversion from 4 to 20 mA to 1 to 5 V Range
1. Remove power from controller.
2. Remove rear housing assembly (containing 32-pin terminal block) by removing four
screws.
3. Snip out the resistor associated with the input range being changed. See Figure 89 for
identification of resistors.
4. Replace rear housing assembly and restore power.
Figure 89. Location of Input Range Resistors
Input Range Resistors (4).
Cut leads to remove from
circuit.
AI3
AI2
Printed wiring board
at rear of housing
(inside view).
AI4
AI1
Connectors
Conversion from 1 to 5 V to 4 to 20 mA Range
1. If power source is connected to controller, disconnect it.
2. Solder new input resistor, part number NO986FK (wire wound 250 ohm ±0.1%, 2
W) externally at the 32-pin terminal block between the “+” and “-” input signal leads
of the input range being changed. See Figure 90.
3. Restore power.
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7. Calibration, Troubleshooting, Maintenance
Figure 90. Addition of Input Range Resistors
Solder
23
Input 3
Input 2
21
Input 4
7
20
Input 1
18
Analog Input
Leads
5
4
2
Terminal Board
Conversion of RTD Input Range
Use IEC 100 or SAMA 100 curves (refer to TI 005-028 or TI 005-274), whichever is applicable,
to determine resistances corresponding to the desired temperature range limits.
Preliminary Steps
To make the conversion, first perform the following steps:
1. Remove controller from housing and place in special housing, part number
L0122TZ, designed to facilitate calibration while the unit is powered.
2. Connect one decade box (for absolute-temperature measurement) or two decade
boxes (for temperature-difference measurement) to the 32-pin terminal block as
shown in Figure 87.
3. On RTD printed wiring assembly, connect 0 to 12 V voltmeter to pins 9 (+) and 1 (-).
Use miniature hook clips or internal pin connectors to make connections. See Figure
91.
4. On PWA, connect Jumpers J1, J3, and J4 as specified in Figure 91 and Table 31
through Table 33. (Jumper J4 is used only with temperature-difference measurement.)
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7. Calibration, Troubleshooting, Maintenance
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Figure 91. RTD Printed Wiring Assembly
0 to 12 V Voltmeter
1 (-)
P9
P1
P2
P8
P3
P4
P7
P5
P6
9 (+)
Zero Elevation
Jumper (J3)
Zero Pot.
(R27)
P15
P16 P17
Temp. Difference.
Jumper (J4)
P12
P13 P10
Span Pot. (R28)
P11
P14
Span Jumper (J1)
Table 31. RTD Span Jumper Positions
Temperature Span Limits
F
200 and 300
300 and 500
500 and 900
900 and 1800
C
111 and 167
167 and 278
278 and 500
500 and 1000
Jumper
Position
(J1)
P10 - P11
P10 - P12
P10 - P13
P10 - P14
Table 32. RTD Zero Elevation Jumper Positions
Lower Range Value
Temperature
F
Above 1170
800 to 1170
450 to 800
125 to 450
-180 to +125
-325 to -150
C
Above 630
425 to 630
230 to 425
55 to 230
-120 to +55
-200 to -100
Jumper
Position
(J3)
P1 - P2
P3 - P4
P5 - P6
P5 - P7
P3 - P8
P1 - P9 (a)
a. With temperature-difference measurement, put jumper in
P1 - P9 position.
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7. Calibration, Troubleshooting, Maintenance
Table 33. RTD Temperature Difference Jumper Positions
Jumper
Position
(J4)
Reference
Temperature
Greater than Lower Range Value
Less than Lower Range Value
P15 - P16
P16 - P17
5. On PWA, turn ZERO and SPAN Potentiometers (R27 and R28) to middle of their
adjustments (about 15 turns in from either end of adjustment).
6. Restore power to controller. Continue with applicable procedure (absolute
temperature or temperature difference) that follows.
Absolute Temperature Measurement
To perform an absolute temperature measurement, do the following:
1. Complete the Preliminary Steps described above.
NOTE
Note In Steps 2 and 3 below, E1 and E2 must be between -4 and +12 V. If either is
outside of these limits, adjust ZERO Potentiometer (R27) so that the value is between
these limits.
2. Set decade box to resistance corresponding to URV (upper-range value). Record
reading of voltmeter; this is E2 in equation in Step 4.
3. Set decade box to resistance corresponding to LRV (lower range value). Record
reading of voltmeter; this is E1 in equation in Step 4.
4. Calculate E3 in equation
4  E2
E3 = -------------------E2 – E1
5. Set decade box at URV, and adjust SPAN Potentiometer (R28) so that voltmeter reads
E3.
6. Set decade box at LRV, and adjust ZERO Potentiometer (R27) so that voltmeter reads
1.000 ±0.004 V.
7. Set decade box at URV. If voltmeter does not read 5±0.01 V, adjust SPAN
Potentiometer (R28) to get correct reading. Repeat Steps 6 and 7 until both readings
are satisfactory.
8. Remove power, disconnect voltmeter and decade box, remove controller from special
housing and replace in original housing, reconnect decade box, restore power.
9. Calibrate Input IN 1 (see “RTD Input” on page 153).
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Temperature Difference Measurement
To perform a temperature difference measurement, do the following:
1. Ascertain that new range meets following limitations:
a. Reference temperature (TREF) cannot be higher than midpoint between LRV
and URV.
b. Temperature difference (T) cannot be less than 200 F(111 C).
2. Complete “Preliminary Steps” (above).
NOTE
In Steps 4 and 5 below, E1 and E2 must be between -4 and +12 V. If either is outside
of these limits, adjust ZERO Potentiometer (R27) so that value is between these
limits.
3. Set reference decade box to resistance corresponding to lower-range value (RLRV). Set
measurement decade box to resistance corresponding to upper-range value (RURV).
4. Record voltmeter reading; this is E2 in equation in Step 6.
5. Set both decade boxes at RLRV. Record voltmeter reading; this is E1 in equation in
Step 6.
6. Solve for E3 in equation
4  E2
E3 = -------------------E2 – E1
7. Set each decade box to value specified in Step 3. Adjust SPAN Potentiometer (R28)
so that voltmeter reads E3.
8. Set both decade boxes to RREF. Adjust ZERO Potentiometer (R27) so that voltmeter
reads Y, where
TREF – TLRV
Y = 1 + ----------------------------------------TURV – TLRV
Example:
TLRV = -50 F, TURV = 150 F, and TREF = 50 F
[Note that TREF is at middle (50%) of span]
50 –  -50 
Y = 1 + -----------------------------  4 = 3V
150 –  -50 
9. Remove power, disconnect voltmeter and decade boxes, unplug controller from rear
housing assembly, reinstall rear housing assembly in housing, replace controller in
housing, reconnect decade boxes, restore power.
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7. Calibration, Troubleshooting, Maintenance
10. Calibrate Input IN 1 (See “RTD Input” on page 153). Use R0% and R100%
calculated in the equations below as the calibrating resistances for zero and full-scale,
respectively.
Calculating Calibrating Resistances for Temp. Difference Measurement
Temperature-difference is an uncompensated, nonlinear measurement. When calibrating the
RTD input, modify the RURV and RLRV values used in the procedure above to minimize the
error due to this nonlinearity, as shown in the equations:
 TREF – TLRV 
R0% = RREF –  RURV – RLRV   ------------------------------------------- TURV – TLRV 
 TREF – TLRV 
R100% = RREF –  RURV – RLRV   ------------------------------------------- TURV – TLRV 
Output 2 Selection
Output 2 is jumper selectable as 1 to 5 V dc nominal into 2 k minimum or 4 to 20 mA nominal
into 500  maximum. See Table 34 for jumper position and Figure 92 for jumper location.
Table 34. Output 2 Jumper Positions
Output
4 to 20 mA
1 to 5 V
160
Jumper Position
P52 - P53
P52 - P54
7. Calibration, Troubleshooting, Maintenance
MI 018-885 – August 2018
Figure 92. Output 2 Jumper Location
P53
P52
P54
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7. Calibration, Troubleshooting, Maintenance
Troubleshooting
Test Display
This TEST checks that all portions of the display can be illuminated. It is accessed by going to
SECURE CALIB in the menu structure (See Figure 84) and pressing the key. The display will
show SECURE TEST. Press the ACK key. The display will change to TEST DISPLAY. Press the
ACK key again. If any segment of the display (except the controller fault indicator) is not
illuminated, that segment is malfunctioning. Press ACK to return to Normal mode after the test.
Error Messages
Certain problems will generate error messages on the display. These messages are described below:
NOVRAM COPY FAIL: Copy function was not successfully executed. Make sure NOVRAMS
and copy accessory are properly seated and try again.
NOVRAM ALL FAIL*: Memory module failures. Both original (master) and copy failed.
NOVRAM MSTR FAIL*: Memory module failure.
WRONG NOVRAM*: Memory module is for a 760, 761, or other controller or contains corrupt
data.
*Replace NOVRAM if these errors occur.
Display Problems
Symptom: Display becomes unstable and flashes on and off.
Possible Cause: Input voltage may have dropped below minimum level.
Symptom: Display goes blank.
Possible Cause: Input voltage may have dropped below minimum level.
Symptom: Display blank and controller fault indicator flashes.
Possible Cause: NOVRAM may not be properly seated or is damaged.
Configuration Problems
Compare the actual configuration of the parameter in question against the desired configuration
as recorded on the Configuration Worksheet. If the worksheet is not available, place the
NOVRAM in another controller. If the problem is present in the second controller, it is most
likely a configuration problem. The copy accessory can often be used to save a corrupted
NOVRAM. Copy a good NOVRAM onto the corrupted NOVRAM.
If the controller oscillates when in automatic, and if the output and measurement stop oscillating
when placed in manual, the controller may not be tuned properly.
If the controller tuning parameters wind up when EXACT is configured and left on, switch
EXACT off or the controller to manual and the output to a safe state.
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Diagnostic Checks
You can check Analog Output 1 and 2, 1 and 5 V voltage references, and the four analog inputs in
the diagnostic mode. You can also check the Contact Inputs and Outputs. To enter this mode,
remove the controller from its housing and insert jumper, part number B0138LY (available from
the company) on pins P2 and P51. See Figure 93. Place controller in housing on bench and
supply power. The display will briefly flash the message “EXACT CONTROL” and then go dark.
Pressing various keys will cause different patterns to appear on the digital and bargraph displays,
including all segments ON and all segments OFF.
!
CAUTION
POTENTIAL MISCONFIGURATION
Never perform diagnostic checks while controller is connected to a process. The checks may
change output values.
Failure to follow these instructions can result in equipment damage.
Figure 93. Location of Diagnostic Jumper
Jumper B0138LY
P2
P51
Now that you are in the diagnostics mode, you can run eight diagnostic checks (one with each of
the keys on the front panel). See Table 35. Read the current at Output 1 on a milliammeter
connected at terminals 26(+) and 27(-) and the current or voltage (depending on the position of
the output jumper) at Output 2 at terminals 8(+) and 6(-). If the current or voltage reading does
not match the expected value for the parameter being tested, there is a problem. The last four
checks require an input. Connect inputs at terminals shown in Figure 86.
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7. Calibration, Troubleshooting, Maintenance
Table 35. Diagnostics
Key
Tested Parameter

Full Scale
(approx. 23 mA or 5.75 V)

W/P
Zero (0 mA or 0 V)
5 V Reference
(20 mA or 5 V)
SEL
1 V Reference
(4 mA or 0 V)
R/L
Analog Input 4
TAG
Analog Input 3
A/M
Analog Input 1
ACK
Analog Input 2
In the Diagnostic Mode, Contact Inputs are repeated to the Contact Outputs. Contact Inputs
and Outputs are connected at the terminals shown in Table 36.
Table 36. Contact Input and Output Terminals
Signal
Terminal
CI 1
Common
CI 2
29
30
28
CO 1
Common
CO 2
32
30
31
Return to Normal Operating Mode by removing power from your bench housing, removing the
diagnostic jumper, and replacing controller into its original housing.
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7. Calibration, Troubleshooting, Maintenance
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Maintenance
General Information
The maintenance of the 762CNA Controller is limited to miscellaneous tests and checks, and
replacement of the parts listed below. For part numbers, see Appendix D.
 Front panel assembly
 NOVRAM and associated three memory chips (ROMs)
 Transformer assembly
 Rear panel assembly
 Display Cable
 RTD temperature measurement and output Isolation Boards
 Surge Suppressor
 Miscellaneous mechanical parts
!
CAUTION
EXPLOSION HAZARD
This product has many components that have critical safety characteristics. Component
substitution may impair the electrical safety of this equipment and its suitability for use in Class
I, Division 2 hazardous locations. DO NOT substitute components. Replace components only
with identical factory supplied components.
Failure to follow these instructions can result in death or serious injury.
Attempts by the user to repair the printed wiring assemblies could result in damage and voiding of
the warranty. The recommended repair procedure is replacement of the printed wiring assembly
(PWA) or return of the PWA to the factory for repair.
It is recommended that the controller be removed from its housing to a service bench for
replacement of parts.
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7. Calibration, Troubleshooting, Maintenance
Removal and Replacement of Parts
Figure 94 is essentially self-explanatory in showing how parts are removed and reinstalled. Refer to
the applicable sections immediately following for additional details.
. . . .. .. .. .. .. ..
...
Figure 94. Controller Assembly Diagram
PANEL
REAR PANEL
ASSEMBLY
TRANSFORMER
ASSEMBLY
FUSE
LATCH
FRONT PANEL
ASSEMBLY
RTD PWA
NOVRAM (X9)
ISOLATION PWA
NUMERIC PROCESSOR FIRMWARE (lower)(X8)
NUMERIC PROCESSOR FIRMWARE (upper)(X7)
DISPLAY PROCESSOR FIRMWARE (X5)
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7. Calibration, Troubleshooting, Maintenance
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Replacement of Fuse
If the controller faceplate has no illumination (including the fault indicator), it may indicate that
either the power supply external to the controller has been interrupted or the fuse inside the
controller has opened.
If the external power supply is intact, check the fuse and, if necessary, replace it with the
applicable slow-blow fuse in Table 37. To expose the fuse, withdraw the controller from its
housing. The fuse is located on the side at the rear of the chassis.
Table 37. Fuses
Supply Voltage
24 V ac or V dc
120 V ac
220, 240 V ac
Current
2A
0.5 A
0.3 A
Fuse Part No.
C3510KX
C3510KP
P0156BM
Front Panel Assembly Replacement
Before removing the front panel, note the routing of the two cables (display and keypad) and how
they plug into their sockets on the printed wiring assembly.
When removing the front panel, first lower the latch cover under the keypad. Then remove the
four screws holding the panel to the housing. Ease the top of the panel out of the housing and tilt
the panel forward to about 45, and then ease the bottom out of the housing and out of the latch
lever.
Precautions When Replacing ROMs
The ROMs, which are MOS devices, are very susceptible to damage from electrostatic discharge,
and precautions must be taken to help protect them from potentials greater than 100 V.
Procedures have been established for the storage and handling of these products to help prevent
electrostatic buildup, and the user should follow recommended practices.
The ROMs (and the NOVRAM) are packed in a special conductive bag. They should be stored in
this bag until they are to be installed. Because the NOVRAM is subject to more handling than the
ROMs, it is supplied in a conductive holder for additional protection.
Transformer Assembly Replacement
The transformer assembly can be replaced by using the following procedure:
1. Remove the signal cable.
2. Remove the four transformer assembly mounting screws and slide the assembly out of
the rear of the chassis.
3. Remove the power cable.
4. Reverse the procedure to install the new transformer assembly.
RTD Input or Isolated Output PWA Replacement
These optional PWAs are installed side-by-side on the main component PWA (See Figure 94).
Observe the following details when either option is a field installation:
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7. Calibration, Troubleshooting, Maintenance
1. Remove jumper(s) from socket(s) of PWA being installed. Save jumper(s) so it can be
reinstalled later if option is to be removed.
2. Plug PWA into its socket and insert mounting screws. Secure PWA in place.
Replacement of Other Parts
The procedures to remove and reinstall other replaceable parts will be obvious from Figure 94.
Before removing a plug-in cable note its routing for correct reinstallation.
168
Appendix A. Specifications
Functional Specifications
Table 38. Functional Specifications — Standard Product
Item
No.
Specification
Analog Input Signals (proportional):
Analog Inputs
4
total
Any combination of the input types listed below. All input
signals are converted ten times per second and can be
characterized and/or combined in a variety of calculations.
4 to 20 mA dc
Current Input
4 to 20 mA dc input (through 250 input resistor across
terminals) is standard.
1 to 5 V dc
Voltage Input
Can accept 1 to 5 V dc by removing the input resistors from
the input terminals.
Thermocouple Input
(requires 893 or ITT-10
Temperature
Transmitter or
equivalent)
1
May be substituted for any Analog Input. Linearization of
displayed value is provided, as follows:
T/C Type
Temperature Range
Type J
–20 to +760 C (–4 to +1400 F)
Type K
–20 to +1380 C (–4 to +2500 F)
Type E
–130 to +540 C (–200 to +1000F)
Resistance Temperature
Detector (RTD) Input,
Direct or Temperature
Difference Measurement.
(Can use up to 4 RTDs on
any input by using 894
transmitters for each.)
1
May be substituted for Analog Input 1 by using a hardware
option. Platinum, per IEC 100 or SAMA* 100 (RC 21-4)
temperature curves. Linearization of displayed value is
provided, as follows:
IEC 100
SAMA 100
Range –200 to +850 C
200 to +600 C
(–330 to +1560 F) (–330 to +1100 F)
Span
110 to 1000 C
110 to 800 C
(198 to 1800 F)
(198 to 1440 F)
Frequency Inputs (proportional):
1 to 9999 Hz
Frequency Input
2
total
Input pulse rates, voltage levels, and field power are
compatible with E83 Series Vortex Flowmeter, and with 81
and 82 Series Turbine Flowmeter having a preamplifier
input. Input impedance is 250 .
*Scientific Apparatus Manufacturers Association
1 to 9999 Hz Pulse Up/
Pulse Down Inputs
1 Pair
The two frequency inputs may combined into one
1-9999 Hz pulse-up/pulse-down pair of inputs driven by an
external contact closure or voltage pulse. Contact
close/open times and pulse voltage level are compatible
with older stepping motor devices.
Contact Inputs:
Two Discrete Inputs
Two non-isolated contact or transistor switch inputs, 5 V dc
nominal open circuit voltage, 1 mA maximum current. Used
for remote status changes such as
A/M, R/L, W/P, EXT ACK, and tracking functions.
Control Functions:
Standard Algorithms
For each controller, the standard algorithms are P, I, PD, PI,
PID, and EXACT control. They may also be configured for:
nonlinear extender, ratio set point, measurement and set
point tracking, output tracking, remote/local set point,
output multiplication or summing, integral feedback,
external limits for output, simple batch control, and cascade
operation.
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Appendix A. Specifications
Table 38. Functional Specifications — Standard Product (Continued)
Item
Other Control
Functions
No.
Specification
Input bias, adjustable gain, and output bias available for
every input.
Characterizers (two available, 8 segments each,
assignable).
10 Boolean Gates, Logic {DIRECT and NOT (single input);
OR, NOR, AND, NAND, XOR, and XNOR (dual input).
Inputs selectable from contact inputs, alarm output states,
status indicator outputs, EXACT state, gate outputs, and
three fixed states.}
Signal Conditioning (square, square root, characterizer).
Split range outputs (configurable for both 4-20 mA outputs)
Auto Selector
Two controllers with a single selected output. The choice of
lower, higher, or logic-selected output is available. One
common or two independent auto/manual functions are
possible.
Totalizer
Up to two 7-digit totalizers are available. Totalizers can be
set to integrate up to or down from a preset value and
produce a logic event output. Any internal or external signal
can be totalized.
Output Signals:
Two Non-isolated
Analog Outputs
Output 1: 4-20 mA nominal into 500 maximum; isolation
provided as an option.
Output 2: 4-20 mA nominal into 500 maximum, or 1-5 V
dc nominal into 2 k minimum, jumper selectable. Can be
assigned by user for measurement, set point, control, or
conditioned input signals.
Two Discrete Outputs
Two non-isolated open collector transistor (NPN) switch
outputs. For status indication of A/M, R/L,
W/P, and alarms. Can also be configured as the destination
for any two of the Boolean Gate Outputs. Contact ratings
are 50 V dc maximum, 250 mA maximum. Leakage current
is 100 μA maximum.
Alarms
Four dual-level alarms are available, each with adjustable
dead band and one Boolean output. Each alarm is
configurable for Absolute, Deviation, Rate-of-Change,
High/Low, High/High, Low/Low, Latching, Nonlatching, or
Permissive. Each alarm can be configured to act on any
one of a number of user-selected points.
Can be configured to indicate alarm status by a
combination of alphanumeric display, the bar graphs, an
alarm symbol, and the contact outputs.
The alarm deadband is adjustable between 0 and 100% of
span.
Calculations
170
There are three calculation functions, designated CALC 1,
CALC 2, and CALC 3. The variables in each calculation
can be any combination of direct inputs to the controller,
configured constants, and results of other calculation
blocks. The available operators are +, –, /, *, >, <, , and
ten Boolean gates. Open and close brackets are also
available for grouping variables.
Appendix A. Specifications
MI 018-885 – August 2018
Table 38. Functional Specifications — Standard Product (Continued)
Item
No.
Specification
Transmitter Power
Supply
Nominal 28 V dc power supply with a 250 limiting resistor
at each transmitter connection. Provides field power for two
4-20 mA transmitters with a maximum series resistance of
350 in each current loop, including the 250input
resistor.
Execution Rate
Ten times per second.
Toggle Mode
If configured, the TOGGLE mode allows a user to toggle
(switch) between a menu level and the normal front panel
display with a single keystroke.
Dynamic
Compensation
The result of CALC 3 may be passed through the dynamic
compensator function prior to distribution. This block
provides lead/lag and dead time functions, each with its
individual follow switch. Functionally, dead time precedes
lead/lag.
Dead time allows the input to be delayed by a configured
time before making it available at the output, thus allowing
the output to lead or lag the input by the configured time.
Both functions can be enabled or by-passed selectively by
using the follow switches.
The impulse can be positive, negative, or bipolar and is part
of the lead/lag function.
Dynamic
Compensation Adjustment
Limits
Dead Time: 0 and 200 minutes
Lead/lag Time: 0 and 200 minutes
Memory
All configuration and operating parameters (not status data)
are stored in a nonvolatile RAM having a ten year data
retention capability. Should a power failure occur, essential
control settings and last operating conditions are saved
indefinitely. No batteries are used.
Input Filter
Second order Butterworth filters. Adjustable from
0 to 10 minutes in 0.01 minute intervals. May be used with
any input proportional signal.
Signal Distribution
Thirty-six signals are available for internal routing. They are
the conditioned and scaled inputs, unconditioned inputs,
control inputs, control outputs, and calculation results.
Power Consumption
12 VA maximum with 4 to 20 mA outputs.
Physical Specifications
Table 39. Physical Specifications – Standard Product
Item
Specification
Display
Vacuum fluorescent lamps in a glass enclosure having a glass
frit seal and tin plated copper pinouts. Horn symbol for alarms is
red; bargraphs and alphanumeric characters are blue/green.
Signal Connections (on rear
panel)
Two 16-position terminal blocks with compression terminals for
wire sizes up to 3.3 mm2 (12 AWG).
Power Connections (on rear
panel)
3-position terminal strip with 8-32 screw connections.
Mounting
Controller mounts through a panel. Refer to Appendix E for
cutout dimensions.
Approximate Mass
2.8 kg (6.2 lb)
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Appendix A. Specifications
Operating and Storage Conditions
Table 40. Operating and Storage Conditions
Influence
Normal
Operating
Condition
Limits
Reference
Operating
Conditions
Operative
Limits
Transportation and
Storage Limits
Ambient
Temperature
23±2°C
(73±3°F)
-10 and +60°C(15 -10 and +60°C *
and 140°F)
(15 and 140°F)
-40 and +70°C
(-40 and +160°F)
Relative
Humidity
50±10%
5 and 95%
noncondensing
5 and 95%
noncondensing
0 and 100%
noncondensing
Supply
Voltage
24,120,220 and 240 V ac, +10, -15%
V ac, ±1%
V dc, +10, -15%
24 V dc, ±1%
V ac, +15, -20%
V dc, +10, -15%
NA
Supply
Frequency
50/60 Hz, ±0.1 Hz
50/60 Hz, ±3 Hz
47 and 63 Hz
NA
Vibration
Negligible
5 and 200 Hz at -an acceleration of
2.5 m/s/s
10 m/s/s (1g) for 1
hour when in
shipping container
Mechanical
Shock
Negligible
--
A 42-inch drop
when in shipping
container
--
*Lower operative limit extends to -20°C (-5°F) with Enclosure Heater option.
Electrical Specifications
Table 41. Electrical Classification
Testing Laboratory,
Types of Protection, and
Area Classification
Application Conditions
Model Code
CSA for use in Ordinary
Locations.
Controllers without a housing
are not approved.
CS-E/CG-A
CSA for Class I, Division 2,
Groups A, B, C, and D.
Controllers without a housing CS-E/CN-A
are not approved. Temperature
Code T5.
FM for Class I, Division 2,
Groups A, B, C, and D.
Temperature Code T5.
Controllers without a housing
are not approved.
CS-E/FN-A
NOTE
These controllers have been designed to meet the electrical specifications listed in the
table above. For detailed information or status of testing laboratory
approvals/certifications, contact Global Customer Support.
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Appendix A. Specifications
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Performance Specifications
Parameter
Accuracy
Set Point
±0.1% of span
Input
Analog
RTD (Direct Measurement)
±0.1% of span
±0.5% °C
Output
±0.5% of span
Linearization
RTD
Thermocouple
±0.5 °C, reading only
±0.5 °C, reading only
Resolution
Display:±0.1% of span
Bargraph:±2% of span
Frequency Response
Analog input to output conversion is flat to 3 Hz.
Supply Voltage Effect
±0.1% of span (maximum) for a +10% or –15% change in ac or dc voltage within normal
operating conditions.
Output Noise
0.25% maximum, peak-to-peak.
Ambient Temperature Effect
Maximum error in percent of span, except as noted, for a 30 C (55 F) change in temperature
within normal operating limits is:
Parameter
Maximum Error
Set Point
Local
Remote
less than 0.1%
less than 0.5%
Input
Analog
Frequency
RTD
less than 0.5%
less than 0.25%
less than 0.5 C
Output
less than 0.5%
Humidity Effect
Maximum error in any conversion, calculation, or setting is ±0.1% of span for a change from
reference conditions to 95% R.H. at 30 C (85 F) wet bulb.
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Appendix A. Specifications
Optional Features and Accessories
Table 42. Optional Features and Accessories
Feature
174
Specification
Output Isolation
This option provides an isolated 4-20 mA nominal signal (500  load
maximum) on Output No. 1. Specify by selecting Option suffix “-1”.
Platinum RTD Input
This option provides for accepting a platinum RTD on input number 1.
Calibrated per IEC 100 or SAMA 100 temperature curves. Each curve is
linearized for digital readout over the ranges and spans listed below:
IEC 100 (Direct or T Measurement)
Range: –200 to +805 C (–330 to +1560 F)
Span: 110 to 1000 C (198 to 1800 F)
SAMA 100 (Direct or T Measurement)
Range: –200 to +600 C (–330 to +1100 F)
Span: 110 to 800 C (198 to 1440 F)
Specify by selecting Model Code Optional Suffix “-2”.
Configuration Copy
Accessory
All of the operating configuration data is stored in a NOVRAM. The copy
accessory permits the entire contents of the NOVRAM module to be
quickly copied to another NOVRAM, either a spare, or one from another
controller. Specify Part Number L0122TU for the copy accessory, and
Part Number K0141LN for a spare NOVRAM.
Surge Suppressor
A surge suppressor is available as an option for use with serial
communication input when external wiring is located near transient
producing sources such as meters, solenoids, high voltages, etc. Specify
Auxiliary Specification (AS) SURSUP.
Diagnostic Jumper
A diagnostic jumper, part number B0138LY, is available for use in
controller troubleshooting. Installing the jumper on the main PWA enables
checking the two analog outputs, four analog inputs, 1 and 5 V voltage
references, and the discrete inputs and outputs.
Factory
Preconfiguration
Unless otherwise specified, the unit is shipped with a Factory Default
configuration consisting of a single measurement input, a local set point,
PID control, and scale ranges of 0 to 100 percent.
Many optional factory preconfigurations are available. Select the
preconfiguration that most closely meets your needs and then make
changes in the field as needed to meet your specific needs. It usually is
necessary to change, at minimum, the loop tag, the scale ranges, and the
PID controller tuning parameters to suit process requirements.
Optional factory preconfiguration is offered without additional charge. To
order, refer to the Model Code and specify the AS for the configuration
that most nearly meets your needs. The AS is shown in the loop tag
display to assist in initial field identification.
Appendix B. Configuration
Worksheets
Table 47 contains the actual configuration worksheets. Figure 95 defines the content of the
worksheets. Tables 43, 44, 45, and 46 contain reference data needed for making configuration
entries.
This appendix also contains diagrams of optional factory preconfiguration options that may have
been specified. The Auxiliary Specification (AS) reference code used to specify a preconfiguration
option is initially displayed in the looptag position on the controller faceplate to assist you in
initial field identification.
175
MI 018-885 – August 2018
Appendix B. Configuration Worksheets
Figure 95. Definition of Worksheet Contents
“Map-locator” that identifies the specific structure diagram sheet in
Appendix C that contains the parameter and also the XY coordinates of the
location of the parameter on that
sheet. The first digit is the sheet number; the second is the XY location.
Limits of each
parameter.
Prompts to parameters in the order in
which they are displayed when you
step through the
menu structure.
Structure
diagram
Location
Prompt/Parameter
Space for you to
record your specific
configuration.
Standard factory configuration as shipped.
Factory Preconfiguration Options
will differ.
Standard
Factory
Configuration
Parameter
Limits
User
Configuration
Additional information and space for
your notations.
Remarks
and Notes
CONFIG SETPT
5-G1
SETPT
----
TYPE
5-H1
LOCAL, R/L,
RATIO
(R/L)
----
RL
----
LOCAL
LOGIC
See Table 44.
NONE
See Table 44.
NONE
R, L
L
LOCTRK
SWITCH
STARTUP
INBIAS
-99.9 and +102% 0.0
SOURCE See Table 43.
5-G1
5-H1
(RATIO)
----
RL
----
D
LOGIC
See Table 44.
NONE
See Table 44.
NONE
R, L
L
LOCTRK
SWITCH
STARTUP
OUTBIAS -99.9 AND
+102%
SIGNAL
INBIAS
----99.9 AND
+102%
See Table 43
SOURCE
176
0.0
0.0
If LOCAL, ACK key
takes you to MEAS
TRK.
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 43. Signal Distribution List
Name
Signal
Name
Signal
A
Conditioned Analog Input IN1
C2 OUT
B
Conditioned Analog Input IN2
ASELOUT
Controller 2 Output
Selected Output of Auto Selector
C
Conditioned Analog Input IN3
AOUT 1
Analog Output 1
D
Conditioned Analog Input IN4
AOUT 2
Analog Output 2
E
Conditioned Input F1
CALC 1
Output of Calculation 1
F
Conditioned Input F2
CALC 2
Output of Calculation 2
G
Constant
CALC 3
Output of Calculation 3
H
Constant
IN1
Analog Input 1
I
Constant
IN2
Analog Input 2
J
Constant
IN3
Analog Input 3
C1 MEAS
Controller 1 Measurement
IN4
Analog Input 4
C1 LOCSP
Controller 1 Local Set Point
F1
Frequency Input 1
C1 REMSP
Controller 1 Remote Set Point
F2
Frequency Input 2
C1 SETP
Controller 1 Set Point
TOTAL 1
Totalizer 1 (Lower 2 bytes of 3-byte number)
C1 OUT
Controller 1 Output
TOTAL 2
Totalizer 2 (Lower 2 bytes of 3-byte number)
C2 MEAS
Controller 2 Measurement
100 PCT
Constant with value of 100%
C2 LOCSP
Controller 2 Local Set Point
0 PCT
Constant with value of 0 %
C2 REMSP
Controller 2 Remote Set Point
None
No Source
C2 SETP
Controller 2 Set Point
Table 44. Gate Input List
Name
Source
True State
Name
Source
True State
CI1
Contact Input 1
Closed
CI2
Contact Input 2
Closed
AUTOSEL Auto Select Output
State
False = C2 OUT
True = C1 OUT
ALARM 1
State of Alarm 1
In Alarm
GATE 0
Output of Gate 0
True
ALARM 2
State of Alarm 2
In Alarm
GATE 1
Output of Gate 1
True
ALARM 3
State of Alarm 3
In Alarm
GATE 2
Output of Gate 2
True
ALARM 4
State of Alarm 4
In Alarm
GATE 3
Output of Gate 3
True
C1 A/M
State of Controller 1 Automatic or Automatic
Manual
GATE 4
Output of Gate 4
True
C1 R/L
State of Controller 1 Remote or
Local
GATE 5
Output of Gate 5
True
C2 A/M
State of Controller 2 Automatic or Automatic
Manual
GATE 6
Output of Gate 6
True
C2 R/L
State of Controller 2 Remote or
Local
GATE 7
Output of Gate 7
True
Remote
Remote
W/P
State of Workstation or Panel
Workstation
GATE 8
Output of Gate 8
True
COMMFAIL
Communications Timeout
Timed Out
GATE 9
Output of Gate 9
True
C1 EXACT
State of EXACT, Controller 1
Enabled
ON
Fixed State Input
Always
C2 EXACT
State of EXACT, Controller 2
Enabled
OFF
Fixed State Input
Never
TOTAL 1
State of Totalizer 1
Totalizer reached
preset value
NONE
Function Switch not N/A
used
TOTAL 2
State of Totalizer 2
Totalizer reached
preset value
177
MI 018-885 – August 2018
Appendix B. Configuration Worksheets
Table 45. List of Characters
Character
9 through 0
.(decimal)
-(minus)
blank
A through Z
_(underline)
\
@
?
>
=
<
/
,(comma)
+
*
)
(
’(apostrophe)
(test) (a)
 (sq root)
°(degree)
a. All character segments
lighted
Table 46. Characterization Curve Planning Table
CHAR 1
178
CHAR 2
X01 = _____
Y01 = _____
X01 = _____
Y01 = _____
X02 = _____
Y02 = _____
X02 = _____
Y02 = _____
X03 = _____
Y03 = _____
X03 = _____
Y03 = _____
X04 = _____
Y04 = _____
X04 = _____
Y04 = _____
X05 = _____
Y05 = _____
X05 = _____
Y05 = _____
X06 = _____
Y06 = _____
X06 = _____
Y06 = _____
X07 = _____
Y07 = _____
X07 = _____
Y07 = _____
X08 = _____
Y08 = _____
X08 = _____
Y08 = _____
X09 = _____
Y09 = _____
Y09 = _____
Y09 = _____
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
TUNE C1
4-A1
4-B1
4-C1
4-C2
4-B1
SECURE ALLTUNE
----
ALLTUNE TUNE C1
----
PF
1 and 8000%
200
IF
0.01 and 200 min/repeat
2.0
DF
0 and 100 minutes
0.0
SPLAG
0.00 and 1.00
1.00
EXACT
----
STATE
ON, OFF
RD EXACT
----
STATE
message (ON,OFF)
OFF
(no entry)
ENT
message
INIT
(no entry)
STUN
message
OFF
(no entry)
P
1 and 8000%
From TUNEC1
PF
I
0.01 and 200 repeats/min.
From TUNEC1
IF
D
0 and 100 min.
From TUNEC1
DF
PK 1
-102 and +102%
----
PK 2
-102 and +102%
----
PK 3
-102 and +102%
----
TPK 1
<WMAX
----
TPK 2
WMAX
----
TPK 3
>WMAX
----
ERR
-102 and +102%
----
USER SET
----
If configured I ONLY at
Loc. 5-B1, ACK key takes
you to C1 LIMIT
OFF
NB
0.1 and 30%
2.0
WMAX
0.1 and 200 minutes
5.00
ON/OFF choice is available only if EXACT NONE
is configured at Location
5-G3
READ only
DMP
0.1 and 1
0.2
OVR
0 and 1
0.50
CLM
1.25 and 100
10.00
DFCT
0 and 4
1.00
LIM
2 and 80%
80.0
BUMP
-50 and +50%
8.0
PTUNE
----
STATE
ON, OFF
OFF
RD PTUNE
message (ON, OFF)
OFF
BIAS
-99.9 and +102%
50.0
Only if configured P/PD
BALANCE
0.00 and 200 minutes
2.0
Only if configured P/PD
(1st order lag)
PRELOAD
-99.9 and 102%
0.0
Only if BATCH is configured ON
(no entry)
179
MI 018-885 – August 2018
Appendix B. Configuration Worksheets
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
BYPASS
Parameter Limits
ON, OFF
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
OFF
TUNE C1 LIMIT
4-A1
C1 LIMIT
----
4-B1
SP HILIM
-2 and +102%
102.0
SP LOLIM
-2 and +102%
-2.0
OUT HLIM
-2 and +102%
102.0
OUT LLIM
-2 and +102%
-2.0
4-A1
SECURE ALLTUNE
----
4-B1
PF
1 and 8000%
200
IF
0.01 and 200 min./repeat
2.0
DF
0 and 100 minutes
0.0
1.00
4-B1
Batch limits if BATCH is
configured ON at Location 5-G3
TUNE C2
ALLTUNE TUNE C2
4-C1
4-C2
180
If configured I ONLY at
Location 5-B1, ACK key
takes you to C1 LIMIT
SPLAG
0.00 and 1.00
EXACT
----
STATE
ON, OFF
RD EXACT
----
STATE
message (ON,OFF)
OFF
(no entry)
ENT
message
INIT
(no entry)
STUN
message
OFF
(no entry)
P
I and 8000%
From TUNEC2
PF
I
0.01 and 200 min/repeat
From TUNEC2
IF
D
0 and 100 minutes
From TUNEC2
DF
PK 1
-102 and +102%
----
PK 2
-102 and +102%
----
PK 3
-102 and +102%
----
TPK 1
<WMAX
----
TPK 2
WMAX
----
TPK 3
>WMAX
----
ERR
-102 and +102%
----
USER SET
----
OFF
NB
0.1 and 30%
2.0
WMAX
0.1 and 200 minutes
5.00
DMP
0.1 and 1
0.2
OVR
0 and 1
0.50
CLM
1.25 and 100
10.00
DFCT
0 and 4
1.00
LIM
2 and 80%
80.0
BUMP
-50 and +50%
8.0
ON/OFF choice is available only if EXACT NONE
is configured at Location
5-G3
READ only
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets (Continued)
Location
4-B1
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
PTUNE
---
STATE
ON, OFF
OFF
RD PTUNE
message (ON, OFF)
OFF
BIAS
-99.9 and +102%
50.0
Only if configured P/PD
BALANCE
0.00 and 200 minutes
2.0
Only if configured P/PD
(1st order lag)
PRELOAD
-99.9 and 102
0.0
Only if BATCH is configured ON
BYPASS
ON, OFF
OFF
(no entry)
TUNE C2 LIMIT
4-A1
C2 LIMIT
----
4-B1
SP HILIM
-2 and +102%
SP LOLIM
-2 and +102%
-2.0
OUT HLIM
-2 and +102%
102.0
OUT LLIM
-2 and +102%
-2.0
102.0
Batch limits if BATCH is
configured ON at
Loc. 5-G3
TUNE CONSTS
4-A2
ALLTUNE CONSTS
----
G
-99.9 and +102%
50.0
H
-99.9 and +102%
50.0
I
-99.9 and +102%
50.0
J
-99.9 and +102%
50.0
TUNE ALARMS
4-A2
ALLTUNE ALARMS
4-B2
ALARM 1
----
LEVEL 1 =
-99.9 and +102%
102.0
LEVEL 2 =
-99.9 and +102%
-2.0
DB =
0 and 100
2.0
ALARM 2
LEVEL 1 =
-99.9 and +102%
102.0
LEVEL 2 =
-99.9 and +102%
-2.0
DB =
0 and 100
2.0
ALARM 3
LEVEL 1 =
-99.9 and +102%
102.0
LEVEL 2 =
-99.9 and +102%
-2.0
DB =
0 and 100
2.0
ALARM 4
LEVEL 1 =
-99.9 and +102%
102.0
LEVEL 1 =
-99.9 and +102%
-2.0
DB =
0 and 100
2.0
TUNE TOTALS
4-A3
ALLTUNE TOTALS
----
4-B3
TOTAL 1 =
0 and 9999999
0
PRESET 1 =
0 and 9999999
0
T1 STATE
RESET, HOLD, COUNT
COUNT
TOTAL 2 =
0 and 9999999
0
PRESET 2 =
0 and 9999999
0
181
MI 018-885 – August 2018
Appendix B. Configuration Worksheets
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
T2 STATE
Parameter Limits
RESET, HOLD, COUNT
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
COUNT
SHOWOP
2
SHOWOP
----
TUNE C1
YES, NO
YES
C1 LIMITS
YES, NO
YES
TUNE C2
YES, NO
YES
C2 LIMITS
YES, NO
YES
ALARMS
YES, NO
YES
CONSTS
YES, NO
YES
TOTALS
YES, NO
YES
RD CFG
YES, NO
YES
ONE FUNC
CONFIG STRATEGY
5-A1
CONFIG STRATEGY
----
5-B1
ONE FUNC
----
CASCADE
----
AUTO SEL
----
TYPE
LO SELECT, HI SELECT,
GATE 4
LO SELECT
TRK MAN
YES, NO
NO
TWO FUNC
----
For LO SELECT or HI
SELECT only
CONFIG FUNC1
5-A1
CONFIG FUNC1
----
PI, PID
5-B1
PI, PID
See CONFIG DISPLAY
EXACT
See CONFIG DISPLAY
A/M STN
See CONFIG A/M STN
DISPLAY
3 BAR IND
See CONFIG 3 BAR IND
I ONLY
See CONFIG DISPLAY
P, PD
See CONFIG DISPLAY
CONFIG FUNC2
5-A1
CONFIG FUNC2
5-B1
PI, PID
----
PI, PID
See CONFIG DISPLAY
EXACT
See CONFIG DISPLAY
A/M STN
See CONFIG A/M STN
DISPLAY
3 BAR IND
See CONFIG 3 BAR IND
I ONLY
See CONFIG DISPLAY
P, PD
See CONFIG DISPLAY
CONFIG TOTAL 1
5-A1
CONFIG TOTAL 1
5-B1
(YES)
----
TAG
182
YES, NO
NO
If EXACT is configured,
jumps to TOTAL 2
See Table 45
TOTAL
Enter up to 9 characters
SOURCE
See Table 43
A
CNT/SEC
0.1 and 2000
1.0
DEC PT
0 and 7
0
HOLD
See Table 44
NONE
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
RESET
See Table 44
NONE
TYPE
COUNT UP, COUNT DN
COUNT UP
NO
If EXACT is configured,
jumps to CONFIG
INPUTS
Enter up to 9 characters
CONFIG TOTAL 2
5-A1
CONFIG TOTAL 2
YES, NO
5-B1
(YES)
----
TAG
See Table 45
TOTAL
SOURCE
See Table 43
A
CNT/SEC
0.1 and 2000
1.0
DEC PT
0 and 7
0
HOLD
See Table 44
NONE
RESET
See Table 44
NONE
TYPE
COUNT UP, COUNT DN
COUNT UP
CONFIG INPUTS
5-A2
CONFIG INPUTS
----
5-B2
A
----
OUTBIAS =
-99.9 and +102%
0.0
GAIN =
-9.999 and +9.999
1.000
INBIAS =
-99.9 and +102%
0.0
FORMAT =
LINEAR
LINEAR, SQ ROOT,
SQUARED, CHAR 1, CHAR 2
FILTER =
0 and 10 minutes
B
----
OUTBIAS =
-99.9 and +102%
0.0
GAIN =
-9.999 and +9.999
1.000
INBIAS =
-99.9 and +102%
0.0
FORMAT =
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
FILTER =
0 and 10 minutes
C
----
OUTBIAS =
-99.9 and +102%
0.0
GAIN =
-9.999 and +9.999
1.000
INBIAS =
-99.9 and +102%
0.0
FORMAT =
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
FILTER =
0 and 10 minutes
D
----
OUTBIAS =
-99.9 and +102%
0.0
GAIN =
-9.999 and +9.999
1.000
INBIAS =
-99.9 and +102%
0.0
FORMAT =
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
FILTER =
0 and 10 minutes
0.00
FREQ I/P
FREQ, PULSED
FREQ
0.00
0.00
0.00
E
----
OUTBIAS =
-99.9 and +102%
0.0
GAIN =
-9.999 and +9.999
1.000
0.00 minute is no filter
0.00 minute is no filter
0.00 minute is no filter
0.00 minute is no filter
183
MI 018-885 – August 2018
Appendix B. Configuration Worksheets
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
INBIAS =
-99.9 and +102%
FORMAT =
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
FILTER =
0 and 10 minutes
User
Configuration
Remarks/Notes
0.0
0.00
F
----
OUTBIAS =
-99.9 and +102%
GAIN =
-9.999 and +9.999
1.000
INBIAS =
-99.9 and +102%
0.0
FORMAT =
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
FILTER =
0 and 10 minutes
0.00 minute is no filter
0.0
0.00
0.00 minute is no filter
CONFIG ALARMS
5-A2
CONFIG ALARMS
----
5-B2
ALARM 1
----
TYPE
HI/HI, HI/LO, LO/LO, OFF
OFF
ACTION
LATCHING, NON LAT, PERMISVE
NON LAT
FORM
ABS, DEV, ROC
ABS
(DEV REF)
See Table 43
NONE
ATTACH
See Table 43
NONE
ALARM 2
----
TYPE
HI/HI, HI/LO, LO/LO, OFF
OFF
ACTION
LATCHING, NON LAT, PERMISVE
NON LAT
FORM
ABS, DEV, ROC
ABS
(DEV REF)
See Table 43
NONE
ATTACH
See Table 43
NONE
ALARM 3
----
TYPE
HI/HI, HI/LO, LO/LO, OFF
OFF
ACTION
LATCHING, NON LAT, PERMISVE
NON LAT
FORM
ABS, DEV, ROC
ABS
(DEV REF)
See Table 43
NONE
ATTACH
See Table 43
NONE
ALARM 4
----
TYPE
HI/HI, HI/LO, LO/LO, OFF
OFF
ACTION
LATCHING, NON LAT, PERMISVE
NON LAT
FORM
ABS, DEV, ROC
ABS
(DEV REF)
See Table 43
NONE
ATTACH
See Table 43
NONE
EXT ACK
See Table 44
NONE
184
Configure TYPE,
ACTION, FORM and then
ATTACH input
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
CONFIG GATES
5-A3
CONFIG GATES
----
5-B3
GATE 0
----
LOGIC
DIRECT, NOT
DIRECT
INPUT 1
See Table 44
NONE
GATE 1
----
LOGIC
DIRECT, NOT
DIRECT
INPUT 1
See Table 44
NONE
GATE 2
----
LOGIC
DIRECT, NOT
DIRECT
INPUT 1
See Table 44
NONE
GATE 3
----
LOGIC
DIRECT, NOT
DIRECT
INPUT 1
See Table 44
NONE
GATE 4
----
LOGIC
DIRECT, NOT
DIRECT
INPUT 1
See Table 44
NONE
GATE 5
----
LOGIC
OR, NOR, AND, NAND, XOR, AND
XNOR
INPUT 1
See Table 44
NONE
INPUT 2
See Table 44
NONE
GATE 6
----
LOGIC
OR, NOR, AND, NAND, XOR, AND
XNOR
INPUT 1
See Table 44
NONE
INPUT 2
See Table 44
NONE
GATE 7
----
LOGIC
OR, NOR, AND, NAND, XOR, AND
XNOR
INPUT 1
See Table 44
NONE
INPUT 2
See Table 44
NONE
GATE 8
----
LOGIC
OR, NOR, AND, NAND, XOR, AND
XNOR
INPUT 1
See Table 44
NONE
INPUT 2
See Table 44
NONE
GATE 9
----
LOGIC
OR, NOR, AND, NAND, XOR, AND
XNOR
INPUT 1
See Table 44
NONE
INPUT 2
See Table 44
NONE
185
MI 018-885 – August 2018
Appendix B. Configuration Worksheets
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
CONFIG CALC
5-C1
5-D1
CONFIG CALC
----
CALC 1 =
----
A
CALC 2 =
----
A
CALC 3 =
----
A
DYNC
0N, 0FF
0FF
Select up to 9 characters
from Table 20
If OFF, ACK key takes
you to CHAR 1
(0N)
If ON, CALC 3 is dynamically compensated
DEADTIME
----
TIME
0 and 200 minutes
0.00
FOLLOW
See Table 44.
OFF
LEADLAG
----
GAIN =
0 and 9.999 minutes
1.000
BIAS =
-99.9 and +102%
0.0
TIME =
0 and 200 minutes
0.00
IMPULSE
NONE, BIPOLAR,
POSITIVE, NEGATIVE
NONE
5-D2
FOLLOW
See Table 44
OFF
5-C1
CHAR 1
----
5-D1
POINTS
1 and 9
2
X1, X2, etc.
-99.9 and +102%
0.0, 100.0
See
Table 46
Display will alternate
between CHAR 1 Xn and
CHAR 1 Yn
Y1, Y2, etc.
-99.9 and +102%
0.0, 100.0
See
Table 46
Display will alternate
between CHAR 1 Xn and
CHAR 1 Yn
5-C1
CHAR 2
----
5-D1
POINTS
1 and 9
2
X1, X2, etc.
-99.9 and +102%
0.0, 100.0
See
Table 46
Display will alternate
between CHAR 2 Xn and
CHAR 2 Yn
Y1, Y2, etc.
-99.9 and +102%
0.0, 100.0
See
Table 46
Display will alternate
between CHAR 2 Xn and
CHAR 2 Yn
CONFIG OUTPUTS
5-C2
5-D2
CONFIG OUTPUTS
----
CO 1
See Table 44
CO 2
See Table 44
NONE
SPLT RNG
YES, NO
NO
NONE
(YES)
SPLIT PT
0 and 100%
50
DEADBAND
0 AND 10
5
LOW ACT
INC/INC, INC/DEC
INC/DEC
INC/INC
HI ACT
INC/INC, INC/DEC
5-C2
AOUT 1
----
5-D2
REVERSE
YES, NO
NO
SOURCE
See Table 43
NONE
186
Only if output is assignable
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
5-C2
AOUT 2
----
5-D2
REVERSE
YES, NO
NO
SOURCE
See Table 43
NONE
---
OFF
ADDRESS
0 and 99
0
BAUD
2400, 4800, 9600,19200
4800
PARITY
ODD, EVEN. NONE
NONE
TIMEOUT
0 and 200 minutes
10.0
User
Configuration
Remarks/Notes
Only if output is assignable
CONFIG W/P
5-C2
CONFIG W/P
(ON)
5-D2
5-D3
FLUNK
W, P, LAST W/P
P
PRIORITY
W, P, BOTH
P
STARTUP
W, P
P
SWITCH
See Table 44
NONE
If 0.00, function never
times out
Never set to W when PRIORITY is set to W
CONFIG PASSCODE, TOGGLE
5-C2
CONFIG NEW PASS = 3 characters
Three blanks
Select characters from
Table 45
VERIFY =
CONFIG TOGGLE
ON, OFF
OFF
187
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Appendix B. Configuration Worksheets
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
CONFIG DISPLAY
CNTL 1
5-E1
CONFIG DISPLAY
CNTL 2
----
TOP LINE
TAG, VARIABLE
TAG
(TAG)
See Table 45
762 MICRO
TYPE
LINEAR, TEMP
LINEAR
LINEAR
----
ENG UNTS
See Table 45
Enter up to 9 characters
(VARIABLE)
5-F1
URV
-999 and +9999
LRV
-999 and +9999
Enter up to 4 characters
TEMP
----
SCALE
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
IEC 100
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
LRV
Depends on SCALE
5-E1
SOURCE
See Table 43
NONE
5-E2
MEAS, SP
LINEAR, TEMP
LINEAR
TYPE
5-F2
LINEAR
----
ENG UNTS
See Table 45
PCT
URV
-999 and +9999
100.0
LRV
-999 and +9999
0.0
5-E2
TEMP
----
5-F2
SCALE
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
5-E2
5-E2
Enter up to 4 characters
IEC 100
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
100.0
0.0
LRV
Depends on SCALE
OUTBAR
----
SOURCE
See Table 43
RATIO
----
ENG UNTS
See Table 45
PCT
URV
-999 and +9999
100.0
See Remarks
LRV
-999 and +9999
0.0
ALARMS
----
----
MEAS ALM
YES, NO
NO
OUT ALM
YES, NO
NO
PH DISP
ON, OFF
OFF
C1 OUT for Controller 1
C2 OUT for Controller 2
CONFIG SETPT
5-G1
5-H1
188
SETPT
----
TYPE
LOCAL, R/L, RATIO
(R/L)
----
RL LOGIC
----
LOCTRK
See Table 44
LOCAL
OFF
If LOCAL, ACK key takes
you to MEAS TRK
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
SWITCH
See Table 44
STARTUP
R, L
L
INBIAS
-99.9 and +102%
0.0
B
User
Configuration
SOURCE
See Table 43
5-G1
(RATIO)
----
5-H1
RL LOGIC
----
LOCTRK
See Table 44
OFF
SWITCH
See Table 44
NONE
CNTL 1
5-G1
STARTUP
R, L
L
OUTBIAS
-99.9 AND +102%
0.0
SIGNAL
----
INBIAS
-99.9 AND +102%
Remarks/Notes
NONE
CNTL 2
0.0
SOURCE
See Table 43
RANGE
0-1.0 and 0-5.0
SOURCE
FCEPLATE, ROUTED
FCEPLATE
(ROUTED)
See Table 43
IN2
MEAS TRK
See Table 44
OFF
FORMAT
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
0-1.0
CONFIG MEAS
5-G2
MEAS
----
FORMAT
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
SOURCE
See Table 43
A
CONFIG A/M
5-G2
A/M
STARTUP
A, M
M
FLUNK
A, M, LAST A/M
M
SWITCH
See Table 43
NONE
NONLIN
CHAR 1, CHAR 2, NO
NO
ACTION
INC/DEC, INC/INC
INC/DEC
CONFIG NONLIN, ACTION
5-G2
CONFIG OUTPUT
5-G3
5-G3
OUTPUT
----
FORMAT
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
MODIFIER
OUTMUL, OUTSUM, NO
NO
OUTMUL
See Table 43
B
OUTSUM
See Table 43
B
OUTTRK
----
SWITCH
See Table 44
OFF
SOURCE
See Table 43
IN 2
EXTLIM
----
HIGH
----
SWITCH
See Table 44
OFF
SOURCE
See Table 43
IN 2
Do not use OUTMUL if
BATCH is ON
189
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Appendix B. Configuration Worksheets
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
LOW
Parameter Limits
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
----
SWITCH
See Table 44
OFF
SOURCE
See Table 43
IN 2
STARTUP
VALUE, LAST VAL
LAST VAL
(VALUE)
-2 and +102%
0.0
EXACT SW
See Table 44
NONE
BATCH
ON, OFF
OFF
INT FBK
See Table 43
C1 OUT
CONFIG EXACT, BATCH, INT FBK
5-G3
CONFIG 3BARIND
Ind. 1
8-A1
LFT BAR
----
8-B1
TAG
See Table 45
BAR 1
TYPE
LINEAR, TEMP
LINEAR
LINEAR
----
8-C1
ENG UNTS
See Table 45
URV
-999 and +9999
LRV
-999 and +9999
TEMP
----
8-C1
SCALE
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
IEC 100
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
LRV
Depends on SCALE
8-B1
SOURCE
See Table 43
8-A1
MID BAR
----
8-B1
TAG
See Table 45
BAR 2
TYPE
LINEAR, TEMP
LINEAR
LINEAR
----
ENG UNTS
See Table 45
PCT
URV
-999 and +9999
100.0
LRV
-999 and +9999
0.0
8-B1
TEMP
----
8-C1
SCALE
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
8-B1
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
100.0
LRV
Depends on SCALE
0.0
SOURCE
See Table 43
RT BAR
----
8-B1
TAG
See Table 45
BAR 3
TYPE
LINEAR, TEMP
LINEAR
LINEAR
----
8-B1
190
Enter up to 9 characters
Enter up to 4 characters
IEC 100
8-A1
8-C1
Enter up to 9 characters
Enter up to 4 characters
8-B1
8-C1
Ind. 2
ENG UNTS
See Table 45
PCT
URV
-999 and +9999
100.0
LRV
-999 and +9999
0.0
TEMP
----
Enter up to 9 characters
Enter up to 4 characters
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets (Continued)
Location
8-C1
8-B1
Prompt/Parameter
SCALE
Parameter Limits
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
Standard
Factory
Configuration
User
Configuration
Remarks/Notes
IEC 100
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
100.0
LRV
Depends on SCALE
0.0
SOURCE
See Table 43
8-A2
ALARMS
----
8-B2
LBAR ALM
YES, NO
NO
MBAR ALM
YES, NO
NO
RBAR ALM
YES, NO
NO
CONFIG A/M STN DISPLAY
Station 1
9-A1
9-B1
9-C1
DISPLAY
----
TOP LINE
TAG, VARIABLE
TAG
(TAG)
See Table 45
762 MICRO
(VARIABLE)
----
TYPE
LINEAR, TEMP
LINEAR
----
ENG UNTS
See Table 45
URV
-999 and +9999
LRV
-999 and +9999
Enter up to 9 characters
LINEAR
Enter up to 4 characters
9-B1
TEMP
----
9-C1
SCALE
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
IEC 100
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
LRV
Depends on SCALE
9-B1
SOURCE
See Table 43
9-A1
SETP
----
9-B1
9-C1
TYPE
LINEAR, TEMP, NONE
(LINEAR)
----
NONE
LINEAR
ENG UNTS
See Table 45
PCT
URV
-999 and +9999
100.0
0.0
LRV
-999 and +9999
9-B1
(TEMP)
---
9-C1
SCALE
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
IEC 100
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
100.0
LRV
Depends on SCALE
0.0
MEAS
----
9-A1
9-B1
9-C1
9-B1
TYPE
LINEAR, TEMP
LINEAR
----
Station 2
Enter up to 4 characters
LINEAR
ENG UNTS
See Table 45
PCT
URV
-999 and +9999
100.0
LRV
-999 and +9999
0.0
TEMP
----
Enter up to 4 characters
191
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Appendix B. Configuration Worksheets
Table 47. Configuration Worksheets (Continued)
Location
9-C1
Prompt/Parameter
SCALE
Parameter Limits
IEC 100, SAMA 100,
T/C J, T/C K, T/C E
Standard
Factory
Configuration
IEC 100
ENG UNTS
DEG F, DEG C
DEG C
URV
Depends on SCALE
100.0
0.0
LRV
Depends on SCALE
9-A2
OUTBAR
----
SOURCE
See Table 43
9-A2
ALARMS
----
MEAS
YES, NO
NO
OUT
YES, NO
NO
C1 OUT
CONFIG A/M STN SETPT
9-A3
9-B3
9-A3
SET PT
----
TYPE
LOCAL, R/L
(R/L)
----
LOCAL
RL LOGIC
----
LOCTRK
See Table 44
OFF
SWITCH
See Table 44
NONE
STARTUP
R, L
L
INBIAS
-99.9 and +102%
0.0
SOURCE
See Table 43
B
MEAS TRK
See Table 44
NONE
FORMAT
LINEAR, SQ ROOT,
SQUARED CHAR 1, CHAR 2
LINEAR
CONFIG A/M STN MEAS, A/M
9-D1
MEAS
----
FORMAT
LINEAR, SQ ROOT,
SQUARED CHAR 1, CHAR 2
LINEAR
SOURCE
See Table 43
A
A/M
---
STARTUP
A, M
FLUNK
A, M, LAST A/M
M
SWITCH
See Table 44
NONE
M
CONFIG A/M STN OUTPUT
9-D2
OUTPUT
---
SOURCE
See Table 43
FORMAT
LINEAR, SQ ROOT,
LINEAR
SQUARED, CHAR 1, CHAR 2
MODIFIER
OUTMUL, OUTSUM, NO
NO
OUTMUL
See Table 43
B
OUTSUM
See Table 43
B
9-D3
OUTTRK
---
9-E3
SWITCH
See Table 44
OFF
SOURCE
See Table 43
IN 2
9-D3
EXTLIM
---
9-E3
HIGH
---
9-E2
192
SWITCH
See Table 44
OFF
SOURCE
See Table 43
IN 2
LOW
---
User
Configuration
Remarks/Notes
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
Table 47. Configuration Worksheets (Continued)
Location
Prompt/Parameter
Parameter Limits
Standard
Factory
Configuration
SWITCH
See Table 44
OFF
IN 3
SOURCE
See Table 43
9-D3
STARTUP
VALUE, LAST VAL
LAST VAL
9-E3
(VALUE)
-2 and +102%
0.0
User
Configuration
Remarks/Notes
193
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Factory Preconfiguration Diagrams
194
Appendix B. Configuration Worksheets
Appendix B. Configuration Worksheets
MI 018-885 – August 2018
195
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Appendix B. Configuration Worksheets
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216
Appendix B. Configuration Worksheets
Appendix C. Structure Diagrams
This appendix contains the structure diagrams for the 762C Controller. By following this
appendix, you can locate the parameter you wish to read or change.
 Access to the structure from Normal Operation is achieved by pressing the TAG key.
This brings you to the first item in the structure, READ.
 The and keys move you vertically within a connected group of parameters in the
diagram.
 The ACK key moves you horizontally through a group of parameters and then on to
the next group.
 The SEL key moves you back through the diagram in minor increments.
At various points in the diagrams you will find arrows and numbered balloons. These direct you
to subsequent pages in the diagram. Also, some sections are marked with an asterisk (*) with a
note to repeat for a similar entry. This is done to keep the diagrams as brief as possible.
Throughout the text of Chapter 4, “Configuration” and in Appendix B, Configuration
Worksheets, you will find location designators (e.g., 5-B2). These direct you to the parameter you
are looking for in the diagram. In the example given, the 5 refers to the diagram beginning with
Balloon number 5 in the upper left hand corner (Structure Diagram 5). The designation B2 refers
to map coordinates on that page. Therefore, a reference to configure ALARM 1 is 5-B2.
217
MI 018-885 – August 2018
Appendix C. Structure Diagrams
A
1
B
C
1
5
Location 5 - B2
2
2
3
3
4
4
A
B
C
= Diagram number
= Category or subdivision which appears
in the upper or lower digital (alphanumeric) display
A - C =Horizontal axis diagram coordinate
1 - 4 =Vertical axis diagram coordinate
Example: Location 5-B2 refers to diagram with balloon 5
in the upper left corner of the diagram and coordinates B
(horizontal) and 2 (vertical) within that diagram.
218
Appendix C. Structure Diagrams
MI 018-885 – August 2018
Figure 96. Structure Diagram 1 – READ
A
B
READ
VALUES
C
INPUTS
D
E
IN 1
IN 2
IN 3
IN 4
F1
1
1
F2
SIGNALS
A
REP B-F
*
AOUT 1
AOUT 2
C1 OUT
C2 OUT
ASEL OUT
CALC 1
CALC 2
CALC 3
TOTALS
2
2
TOTAL 1 =
PRESET 1
TOTAL 2 =
PRESET 2
CONSTS
G
REP H-J
CONTACTS
*
CI 1
CI 2
CO 1
CO 2
GATES
GATE 0
REP 1-9
ALARMS
LIMITS
CONFIG
VERSION
OPTUNE
SECURE
C1 SPHL
NUM PROC
DIS PROC
DB
3
C1 OUTHL
C1 OUTLL
C2 SPHL
C2 SPLL
C2 OUTHL
C2 OUTLL
PASSCODE
ALLTUNE
SHOWOP
CONFIG
CALIB
TEST
* REP = Repeat for similar entry
B
LEVEL2
4
4
A
*
C1 SPLL
5
NOVRAM
SET
LEVEL1
ALARM 1
REP 2-4
3
*
C
D
4
2
5
3
4
DISPLAY
E
219
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Appendix C. Structure Diagrams
Figure 97. Structure Diagrams 2 and 3
2
3
CALIB
SHOWOP
INPUTS
TUNE C1
YES
NO
C1 LIMITS
YES
NO
TUNE C2
YES
NO
C2 LIMITS
YES
NO
ALARMS
YES
NO
CONSTS
YES
NO
TOTALS
YES
NO
RD CFG
YES
NO
ANALOG
INTERNAL
EXTERNAL
IN1 ZR
IN1 FS
REP 2-4
ZERO
F1
FREQ
FS
REP 2
OUTPUTS
OUT 1
ZERO
FS
REP 2
* REP = Repeat for similar entry
220
*
*
Appendix C. Structure Diagrams
MI 018-885 – August 2018
Figure 98. Structure Diagrams 4 – ALLTUNE (OPTUNE), 5 – Configuration, 6 – Signal
Distribution List, and 7 – Gate Input List
A
4
ALLTUNE
C
B
TUNE C1
PF
(OPTUNE)
IF
DF
SPLAG
EXACT
STATE
ON
OFF
RD EXACT
STATE
BIAS
BALANCE
ENT
STUN
PRELOAD
BYPASS
C1 LIMIT
ON
OFF
I
D
SP HILIM
SP LOLIM
OUT HILIM
OUT LLIM
TUNE C2
*
C2 LIMIT
*
1
P
PK 1
PK 2
PK 3
TPK 1
TPK 2
TPK 3
ERR
USER SET
NB
WMAX
DMP
OVR
CLM
DFCT
LIM
BUMP
PTUNE
CONSTS
G
H
I
STATE
ON
OFF
2
RD PTUNE
J
ALARMS
ALARM 1
LEVEL1
LEVEL2
DB
REP 2-4
TOTALS
*
TOTAL 1
PRESET 1
T1 STATE
3
RESET
HOLD
COUNT
REP 2
*
* REP = Repeat for similar entry
221
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Appendix C. Structure Diagrams
Figure 99. Structure Diagram 8
8
C
B
A
LFT BAR
TAG
TYPE
1
LINEAR
ENG UNTS
URV
LRV
TEMP
SCALE
6
SOURCE
MID BAR
*
ENG UNTS
RT BAR
*
URV
IEC 100
SAMA 100
T/C J
T/C K
T/C E
1
DEG F
DEG C
LRV
ALARMS
2
LBAR ALM
YES
NO
MBAR ALM
YES
NO
RBAR ALM
YES
NO
2
3
3
*
A
222
B
= Repeat for similar entry
C
Appendix D. Parts List
NOTE
Information in this Parts List is based on PL 009-167136 dated 12/94.
762CNA SINGLE STATION MICRO Controller with
Integral Power Supply Style AA*, DIN Panel Mounted
743CB FIELD STATION MICRO Controller, Style AA*
223
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Appendix D. Parts List
Model Code
762CNA = SINGLE STATION MICRO CONTROLLER, DIN PANEL-MOUNTED WITH INTEGRAL
POWER SUPPLY
VOLTAGE
–A = 120 V AC, 50/60 HZ
–B = 220 V AC, 50/60 HZ
–C = 240 V AC, 50/60 HZ
–D = 24 V DC
–E = 24 V AC, 50/60 HZ
–J = 100 V AC, 50/60 HZ
HOUSING
T = TERMINAL BLOCK ON REAR OF HOUSING
W = CONTROLLER CHASSIS WITHOUT HOUSING
OPTIONAL
–1 = OUTPUT ISOLATION
–2 = RTD INPUT
743CB = FIELD STATION MICRO CONTROLLER
NOMINAL SUPPLY VOLTAGE AND FREQUENCY
–A = 120 V AC, 50/60 HZ
–B = 220 V AC, 50/60 HZ
–C = 240 V AC, 50/60 HZ
–D = 24 V DC
–E = 24 V AC, 50/60 HZ
–J = 100 V AC, 50/60 HZ
MOUNTING
F = PIPE MOUNTING
P = PANEL OR SURFACE MOUNTING
OPTIONAL SELECTIONS
–1 = OUTPUT ISOLATION
–2 = RTD INPUT
–3 = ENCLOSURE HEATER
REQUIRED FOR OPERATING TEMPERATURE BELOW -10 C (+14 F)
DOWN TO A LOWER LIMIT OF -20 C (-4 F)
NOTE
To order parts, contact Global Customer Support.
* The second letter in the style is the firmware style.
224
Appendix D. Parts List
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Figure 100. DIN Panel-Mounted Controller Assembly
25
24
23
225
MI 018-885 – August 2018
Appendix D. Parts List
Figure 101. 743CB FIELD STATION MICRO Controller - Exploded View
Mounting
Plate (Ref)
Part of
Item 12
See Figure D-4 for location
of replaceable memory module
226
Appendix D. Parts List
MI 018-885 – August 2018
Table 48. DIN Panel Mounted Controller Assembly
Item
Part No
Qty
Part Name
1
L0122HX
1
Chassis Assembly
2
B0171PC
1
Data Label
3
X0167VT
4
Tap Screw, 0.143-19 x 0.500, fh
4
L0117AV
1
Base Assembly (see Figure 102)
5
K0143EJ
1
Cover Assembly
6
B0130JX
AR
Adhesive
7
K0143DE
1
Cable Assembly, Display
8
Below
1
Electronic Module (see Figure 104)
L0122JR
For All Model Code Suffixes Except –D
L0122JS
For Model Code Suffix –D
9
X0173NY
7
Washer, Wave
10
A2004EK
4
Screw, 0.138-32 x 0.75, pnh
11
1
Memory Module (see Figure 104)
12
K0143BW
--
1
PWA, Optional (For Model Code Suffix –1)
13
X0169KY
3
Screw, 0.138-32 x 0.25, pnh
14
K0143CB
1
PWA, Optional (For Model Code Suffix –2)
Below
1
*15
Fuse (part of item 17)
C3510KP
1/2 A, 120 V (for Voltage –A and –J)
P0156BM
300 mA, 220/240 V (for Voltage -B and -C)
C3510KX
2 A, 24 V (for Voltage –D and –E)
16
E0118BA
1
Fuseholder (part of item 17)
17
Below
1
Bracket Assembly
L0122HZ
For Model Code Suffix –A
L0122JA
For Model Code Suffix –B
L0122JB
For Model Code Suffix –C
L0122JE
For Model Code Suffix –D
L0122JC
For Model Code Suffix –E
L0122JD
For Model Code Suffix –J
18
G0114AK
2
Clamp, Screw
19
G0114BY
1
Clamp, Upper
20
G0114AJ
1
Clamp, Lower
21
L0122HY
1
Back Panel Assembly
22
X0169YG
4
Tap Screw, 0.112-40 x 0.25, fh
23
L0122HM
1
Housing
24
K0143DU
Terminal Cover (Division 2 only)
25
K0143AH
Terminal Cover (General Purpose only)
Table 49.
Item
1
2
3
Part No
F0109UZ
F0109UY
M0154XT
Qty
1
1
1
Part Name
Controller Housing
Door Assembly
Key, Door Assembly
227
MI 018-885 – August 2018
Appendix D. Parts List
Table 49.
Item
Part No
Qty
4
5
6
7
X0102AF
U0104RC
D0159FH
X0172VY
2
2
1
8
8
9
10
11
-*12
8
2
1
1
1
1
18
X0143SC
S0102CF
L0122TX
D0159FM
D0159FN
Below
D0159FA
D0159GB
D0159FS
D0159FT
Below
C3510KP
P0156BM
C3510KX
D0159FD
X0169KY
X0173 NY
Below
L0122TV
L0122TW
A2004EK
19
20
K0143BW
X0173KY
1
2
21
22
23
*25
*26
27
28
X0143AE
K0143EW
K0143CB
D0159FB
L0117AN
L0117JL
X0169CB
2
1
1
1
1
8
8
29
30
31
32
33
34
35
36
37
38
39
D0159FF
X0169CM
D0159FR
M0154NH
M0154NK
X0116PN
X0166ZA
X0142BK
X0167SY
X0173NS
M0154NJ
2
8
1
1
1
4
4
4
4
4
2
*13
14
15
16
*17
228
1
1
9
A/R
1
A/R
Part Name
Plain Washer, 0.010 thick x 0.128 (see Note 1)
Plain Washer, 0.010 thick x 0.128 (see Note 1)
Bottom Plate
Screw, Special Machine, Cross Recessed Head,
0.190-32 x 0.50
Lockwasher, External Tooth, 0.190
Plug Polyethylene
Termination Assembly
Bracket, Terminal Block
Cover, Terminal Block (not shown)
Power Supply Assembly
for 100 and 120 V ac, 50/60 Hz
for 220 and 240 V ac, 50/60 Hz
for 24 V ac, 50/60 Hz
for 24 V dc
Fuse (included with Item 12)
120 V, 0.5 A
220 V, 0.3 A
24 V dc, 2 A
Transformer Cover
Screw, Pan Head, 0.138-32 x 0.250
Washer, Wave, 0.138
Electronics Module Assembly
Used with all ac power supplies
Used with 24 V dc power supply
Screw, Cross Recessed Head,
0.138-32 x 0.75
Optional Output Isolation PWA
Standoff Spacer, 0.500 Long
(used with Item 19 Option)
Washer, Plain, 0.060 thick x 0.156
Optional Surge Suppressor PWA
Optional Platinum RTD Input PWA
Key Switch Assembly
Display Assembly
Clamp
Screw, Sems, Cross Recessed Head,
0.112-40 x 0.25
Bracket, Display
Screw, Sems, 0.138-32 x 0.25
Display Cover
Bracket, Pipe Mounting
Clamp, Pipe
Carriage Bolt, 0.250-20 x 4.0
Lockwasher, 0.250
Nut, Hexagonal, 0.250-20
Washer, 0.190
Screw, Hex Head, 0.190-32 x 0.50
Bracket, Panel or Surface Mounting
(see Note 2)
Appendix D. Parts List
MI 018-885 – August 2018
Table 49.
Item
Part No
40
41
Qty
M0154XR
X0130MS
1
2
Part Name
Bracket Assembly, Latch
Jack Screw, 0.312-18 x 1.0, for Panel Mounting
*Parts Preceded by an Asterisk are Recommended Spare Parts.
Give Instrument Model Number and Style when Ordering.
See Recommended Spare Parts Summary Section for Quantities.
NOTE 1: More than two each of items 4 and 5 may be used as shims to help
assure that the Door Assembly is centered within the Controller Housing, and
opens and closes freely.
NOTE 2: Item 39 is illustrated for mounting the Housing to a surface. To mount the
Housing to a panel, rotate the bracket 180  and attach to the Housing.
Figure 102. Base Assembly
Table 50. Base Assembly
Item
Part No
Qty
Part Name
1
L0117AN
1
Display Assembly
*2
L0117BS
1
Membrane Switch Assembly
3
L0117AW
1
Base Molding
4
X0120ML
2
Screw, pnh, 0.112-40 x 0.25
5
X0172TE
4
Screw, pnh, 138-32 x 0.75
6
X0167VT
4
Screw, flh, 0.143-19 x 0.500 (not shown)
7
X0143AD
2
Washer, flat, 0.112
8
X0143AE
4
Washer, flat, 0.138
229
MI 018-885 – August 2018
Appendix D. Parts List
Figure 103. Controller Housing Showing Earth (Ground) Wiring
GRN; See Figure D-3
Key Switch
Assembly
(Reference)
See Detail “A”
Conduit
Plate
(Reference)
See
Detail “B”
Ground
Stud
Mounting Plate
(Reference)
Conduit Plate
(Reference)
DETAIL “A”
230
DETAIL “B”
Appendix D. Parts List
Item
47
MI 018-885 – August 2018
Part No.
X0167AJ
Qty
Part Name
9
Nut, Keps, 0.164-32
48
X0143SB
1
Lockwasher, 0.168
49
X0170GR
10
Washer, Plain, 0.168
55
M0154XR
1
Latch Bracket Assembly
56
D0159FZ
2
Jumper, Ground, Keypad
57
D0159FX
1
Jumper, Ground, L.H. Plate
59
D0159GA
1
Jumper Ground
60
D0159FW
1
Jumper, Ground, R.H. Plate
61
D0159GC
1
Jumper, Ground, Capacitor
(see Figure 3)
62
X0169CY
2
Screw, Sems, 0.164-32 x 0.31
63
D0159FY
1
Jumper, Ground, Conduit Plate
Figure 104. Electronics Module Assembly - Digital PWA
QTY 1
QTY 2
Table 51. Digital PWA Portion of Electronics Module Assembly
Item
Part No
*1
K0141LN
2
L0122RL
Qty
1
Part Name
Memory Module (location X9)
1
Set of items 2A, 2B, and 2C
2A
ref
Numeric Processor Firmware, Lower (location X8)
2B
ref
Numeric Processor Firmware, Upper (location X7)
2C
ref
Display Processor Firmware (location X5)
3
Jumper
3
K0143FA
231
MI 018-885 – August 2018
Appendix D. Parts List
Table 51. Digital PWA Portion of Electronics Module Assembly
Item
4
Part No
K0141FN
Qty
Part Name
1
Set of items 1, 2A, 2B, and 2C
Table 52. Recommended Spare Parts Summary
Number of Parts
Recommended for
Figure
Item
Number Number
Part
Number
1
Inst.
5
Inst.
20
Inst.
Part Name
D-1
15
Below
C3510KP
P0156BM
C3510KX
2
2
2
Fuse
1/2 A, for 120 V use
300 mA, for 220/240 V use
2 A, for 24 V use
D-2
2
L0117BS
0
1
1
Membrane Switch Assembly
D-3
1
K0141LN
0
1
1
Memory Module
Figure 105. Power Supply Connections
Item
1
232
Part No.
H0183GW
Qty
2
Part Name
Capacitor, Wafer, 3 kV, 0.01 F
Appendix D. Parts List
MI 018-885 – August 2018
Figure 106. Electronics Module Assembly - Digital PWA
Qty 1
Item
Part No.
Qty 2
Qty
Part Name
*1
L0122RJ
1
Memory Module (NOVRAM), Location X9
2
L0122RL
Ref
Set of Items 2A, 2B, and 2C
2A is Numeric Processor Firmware, Location X8
2B is Numeric Processor Firmware, Location X7
2C is Display Processor Firmware, Location X5
3
K0143FA
3
Jumper
4
L0122RK
Ref
Set of Items 1, 2A, 2B, and 2C
(see items 1 and 2 above)
233
MI 018-885 – August 2018
Number of Parts
Recommended for
Figure
Number
Item
Numbe
r
1
12
Below
D0159FA
D0159GB
D0159FS
D0159FT
13
17
4
234
Appendix D. Parts List
Part
Number
1
Inst.
5
Inst
20
Inst
1
2
4
Power Supply Assembly
for 100 and 120 V ac, 50/60 Hz
for 220 and 240 V ac, 50/60 Hz
for 24 V ac, 50/60 Hz
for 24 V dc
Below
C3510KP
P0156BM
C3510KX
6
12
24
Fuse
120 V, 0.5 A
220 V, 0.3 A
24 V dc
Below
L0122TV
L0122TW
1
2
4
Electronics Module Assembly
With any ac Power Supply
With 24 V dc Power Supply
Part Name
25
D0159FB
1
2
4
Key Switch Assembly
26
L0117AN
1
2
4
Display Assembly
1
L0122RJ
0
1
1
Memory Module (NOVRAM)
Appendix E. Dimensional Print
NOTE
Information in this appendix is based on DP 018-836 dated 10/94.
Figure 107. 762CNA SINGLE STATION MICRO Controller
235
MI 018-885 – August 2018
Appendix E. Dimensional Print
Figure 108. Panel Cutout Dimensions
68.0 to 69.5
2.68 to 2.74
(N X 72.0) - 4.0 = Width (mm); Tolerance = +1.5, -0
(N X 2.84) - 0.16 = Width (in); Tolerance = +.06, -0
138.0 to 139.0
5.43 to 5.47
Single
cutout*
c
3.0 to 3.3
0.12 to 0.13
Cutout for multiple controllers*
Centerline of controller
7.6 to 7.9
0.30 to 0.31
Front
surface of
panel
If panel thickness is greater than 13
mm (0.5 in), a clearance slot for latch
on bottom of controller is required.
13 maximum
0.5
Panel thickness
*If panel has more than one cutout, allow 45 mm (1.78 in) vertical distance between
cutouts as shown below. This provides 36 mm (1.4 in) spacing between controllers.
Upper Cutout
Lower Cutout
45 minimum
1.78
236
Appendix F. Functional Diagram
Figure 109. Functional Diagram
FUNCTIONAL DIAGRAM OF 762C/743CB CONTROLLER
FILTERE D DE RIV
ME AS
SOURCE
INB IA S
FACE PLATE
RO UTE D
CAS CADE
CA SCA DE
PRIMARY
OUTP UT
LIN
SQ R
SQ D
CHAR1
CHAR2
SIGNA L
RANG E
10 0
O UTB IA S
REMO TE S P
S OURCE
NOTE:
For information on input signal
conditioning and scaling, refer to
Chapter 4 – Configuration.
SIG.DIS T. LIST
MEA S
ERROR
DE RIV
FILTER
+
+
+
L IN
CHA R1
CHA R2
x
P RE TUNE
B UMP
S OURCE
F( )
+
x
+
+
I
RATIO
+
ACTIO N
P D,P ID
REMO TE
SE T PT
+
L IN
S QR
S QD
CHA R1
CHA R2
R
SE T P T
L IMITS
L OCTRK
L
S IG . DIST. L IS T
SET PT
SP L EAD/LA G
FILTER
I PID,PD,AM
M
O UTSUM
0%
INCREME NT
INT FB K
BIAS
NOTE:
For information on split ranging,
refer to Chapter 4 – Configuration..
NO NE
CASCADE (RATIO)
AUTO SELECT (HI or LO)
INT FBK, C1
SIGNA L
C1, SP1
C1, MEAS 1
1
100
CO NTR
C1 O UT
1
SE LECTOR
HI or LO
P RIMA RY
CO NTR
x
C2 REMS P S ECONDA RY
CO NTR
C2 OUT
AO UT 1
C2, S P2
C2, MEAS 2
INT FB K, C2
INT FBK , C1
C2 REMS P
SE CONDA RY
CO NTR
INT FB K, C2
C2 OUT
AO UT 1
C1, SP 1
C1, MEAS 1
INT FBK
CO NTR
1
C1 O UT
1
INT FBK , C2
INT FBK , C1
C1, ME AS 1
A OUT 1
C2 OUT
AUTO SELECT (GATE 4)
CASCADE (SIMPLE)
P RIMA RY
CONTR
CO NTR
2
C2, ME AS2
C1, MEAS 1
C1, SP
PID, I
PD
INV ERS E
F( )
BATCH
PRE LOA D
+
C1, SP
LL IM
S OURCE
+
+
OUT
MA NUAL
OUTMUL
MEAS TRK
INB IAS
HLIM
O UTPUT
LIMITS
A
1 00%
1
10 0
INTE GRA L LAG ( T)
PD, AM: T=BA LANCE
I, P ID: T=I
OUTTRK
LIN
SQ R
SQ D
CHAR1
CHAR2
AM
1 00
P
0
A OUT 1
C2 , MEA S2
C2, S P2
C2, MEA S2
CO NTR
2
C2 O UT
INT FB K
G ATE 4
237
MI 018-885 – August 2018
ISSUE DATES
JAN 1995
MAY 1995
FEB 1996
FEB 1998
AUGUST 2018
Vertical lines to the right of text or illustrations indicate areas changed at last issue date.
Schneider Electric Systems USA, Inc.
38 Neponset Avenue
Foxboro, MA 02035
United States of America
http://www.schneider-electric.com
Copyright 1995-2018 Schneider Electric Systems
Global Customer Support
USA, Inc. All rights reserved.
Inside U.S.: 1-866-746-6477
Outside U.S.: 1-508-549-2424
https://pasupport.schneider-electric.com Schneider Electric and I/A series are trademarks of
Schneider Electric Systems USA, Inc., its
subsidiaries, and affiliates. All other trademarks are
the property of their respective owners.
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