Allen-Bradley FLEX I/O 1794-IJ2 User Manual

Allen-Bradley FLEX I/O 1794-IJ2 is a smart I/O module for high-speed frequency measurement. It accepts frequencies up to 32,767 Hz and features two input channels, each configurable for magnetic pickup, proximity probe, or vortex flowmeter. The module can calculate frequency over a user-specified time interval and provides two isolated outputs for fast response applications. It is ideal for various flow and/or turbine metering applications in industries like power management, automotive, food and beverage, and oil and gas.

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Allen-Bradley

FLEX I/O

Frequency

Input Module

(Cat. No. 1794-IJ2)

User

Manual

Allen-Bradley Replacements

Important User Information

Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.

The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for example. Since there are many variables and requirements associated with any particular installation,

Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI-1.1, “Safety Guidelines For The

Application, Installation and Maintenance of Solid State Control”

(available from your local Allen-Bradley office) describes some important differences between solid-state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or in part, without written permission of Allen-Bradley Company, Inc. is prohibited.

Throughout this manual we make notes to alert you to possible injury to people or damage to equipment under specific circumstances.

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss.

Attention helps you:

• identify a hazard

• avoid the hazard

• recognize the consequences

Important: Identifies information that is especially important for successful application and understanding of the product.

Important: We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss.

DeviceNet, DeviceNetManager, and RediSTATION are trademarks of Allen-Bradley Company, Inc.

PLC, PLC-2, PLC-3, and PLC-5 are registered trademarks of Allen-Bradley Company, Inc.

Windows is a trademark of Microsoft.

Microsoft is a registered trademark of Microsoft

IBM is a registered trademark of International Business Machines, Incorporated.

All other brand and product names are trademarks or registered trademarks of their respective companies.

Preface

Using This Manual

Purpose of this Manual

Audience

Vocabulary

Manual Organization

This manual shows you how to use your FLEX I/O 2 input frequency module with Allen-Bradley programmable controllers. The manual helps you install, program and troubleshoot your module.

You must be able to program and operate an Allen-Bradley programmable controller to make efficient use of your FLEX I/O module. In particular, you must know how to program block transfers.

We assume that you know how to do this in this manual. If you do not, refer to the appropriate programming and operations manual before you attempt to program your modules.

In this manual, we refer to:

– the frequency input module as the “input module”

– the Programmable Controller as the “controller”

This manual is divided into five chapters. The following chart lists each chapter with its corresponding title and a brief overview of the topics covered in that chapter.

Chapter

Appendix

Title Contents

Overview of FLEX I/O and Frequency

Input modules

How to Install Your Frequency Input

Module

Module Programming

Writing Configuration to and

Reading Status From with a Remote

I/O Adapter

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Describes FLEX I/O frequency input modules, features, and how they function

How to install and wire the module

Explains block transfer programming, sample programs

Explains how to configure your modules and read status information from your modules when using a remote I/O adapter

Explains how you communicate with your modules, and how the I/O image is mapped when using a DeviceNet adapter

Title Contents

Specifications

Schematics

Specifications for the frequency module

Simplified schematics of frequency input module

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-2

Conventions

Using This Manual

We use these conventions in this manual:

In this manual, we show: that there is more information about a topic in another chapter in this manual

Like this: that there is more information about the topic in another manual

For Additional Information

Catalog

Number

1794

1794-ACN

1794-ACNR

1794-ACN15

1794-ACNR15

1794-ADN

1794-ASB/C

1794-ASB2/B

1794-APB

1794-IB8

1794-OB8

1794-IB16

1794-OB16

1794-IV16

1794-OV16

1794-OB8EP

1794-IB8S

1794-IB10XOB6

1794-IE8

1794-OE4

1794-IE4XOE2

For additional information on FLEX I/O systems and modules, refer to the following documents:

Voltage

24V dc

Description

1794 FLEX I/O Product Data

ControlNet Adapter

Redundant Media ControlNet Adapter

ControlNet Adapter

Redundant Media ControlNet Adapter

DeviceNet Adapter

Remote I/O Adapter

2-Slot Remote I/O Adapter

Profibus Adapter

8 Sink Input Module

8 Source Output Module

16 Sink Input Module

16 Source Output Module

16 Source Input Module

16 Sink Output Module

8 Electronically Fused Output Module

Sensor Input Module

10 Input/6 Output Module

Selectable Analog 8 Input Module

Selectable Analog 4 Output Module

4 Input/2 Output Analog Module

Table continued on next page

Publications

Installation

Instructions

1794-2.1

1794-5.8

1794-5.18

1794-5.47

1794-5.48

1794-5.14

1794-5.50

1794-5.44

1794-5.40

1794-5.30

1794-5.31

1794-5.4

1794-5.3

1794-5.28

1794-5.29

1794-5.20

1794-5.7

1794-5.24

1794-5.6

1794-5.5

1794-5.15

User

Manual

1794-6.5.5

1794-6.5.9

1794-6.5.13

1794-6.5.6

1794-6.5.2

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Summary

Using This Manual -3

Catalog

Number

1794-OF4

1794-IF4

1794-IF2XOF2

1794-IR8

1794-IT8

1794-IRT8

1794-IJ2

1794-IA8

1794-OA8

1794-TB2

1794-TB3

1794-TBN

1794-TBNF

1794-TB3T

1794-TB3S

1794-TB3TS

1794-TB3G

1794-TB3GS

1794-CE1, -CE3

1794-NM1

1794-PS1

Voltage Description

24V dc

4 Output Isolated Analog Module

4 Input Isolated Analog Module

2 Input/2 Output Isolated Analog Module

8 RTD Input Analog Module

24V dc

8 Thermocouple Input Module

8 Thermocouple/RTD Input Module

24V dc 2 Frequency Input Module

120V ac 8 Input Module

120V ac Output Module

2-wire Terminal Base

3-wire Terminal Base

24V dc

Terminal Base Unit

Fused Terminal Base Unit

Temperature Terminal Base Unit

Spring Clamp Terminal Base Unit

Spring Clamp Temperature Base Unit

Terminal Base Unit

Spring Clamp Terminal Base Unit

Extender Cables

Mounting Kit

Power Supply

1794-5.2

1794-5.16

1794-5.17

1794-5.41

1794-5.42

1794-5.43

1794-5.51

1794-5.59

1794-5.12

1794-2.13

1794-5.35

Publications

Installation

Instructions

1794-5.37

1794-5.38

1794-5.39

1794-5.22

1794-5.21

1794-5.50

1794-5.49

1794-5.9

1794-5.10

User

Manual

1794-6.5.8

1794-6.5.4

1794-6.5.7

1794-6.5.12

1794-6.5.11

This preface gave you information on how to use this manual efficiently.

The next chapter introduces you to the frequency module.

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-4 Using This Manual

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Table of Contents

Overview of the Frequency

Input Module

How to Install Your Frequency

Input Module

Chapter 1

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

How You Use the Frequency Input Module . . . . . . . . . . . . . . . . . . . . . 1-1

What the Frequency Input Module Does. . . . . . . . . . . . . . . . . . . . . . . . 1-2

Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Input Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Selecting the Mode(s) of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Output Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Implementing Application Features . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

How Frequency is Calculated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Frequency Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Termination on Number of Pulses . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Missing Pulse Multiplier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Direction Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Chapter 2

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Before You Install Your Input Module . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

European Union Directive Compliance. . . . . . . . . . . . . . . . . . . . . . . . . 2-1

EMC Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Low Voltage Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Wiring the Terminal Base Units (1794-TB3G shown) . . . . . . . . . . . 2-3

Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Mounting the Terminal Base Unit on a DIN Rail . . . . . . . . . . . . . . . 2-4

Panel/Wall Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Mounting the Frequency Input Module on the Terminal Base Unit . 2-7

Connecting Wiring for Your Frequency Input Module . . . . . . . . . . . . . 2-9

Connecting Wiring using a 1794-TB3G and –TB3GS

Terminal Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Wiring connections for the 1794-IJ2 Frequency Input Module . . 2-11

Examples of Wiring to a 1794-TB3G Terminal Base Unit . . . . . . . 2-12

Module Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

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toc–ii

Writing Configuration to and

Reading Status from Your

Module with a Remote I/O

Adapter

How Communication Takes

Place and I/O Image Table

Mapping with the DeviceNet

Adapter

Table of Contents – FLEX I/O Frequency Input Module

Programming Your Frequency

Input Module

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Troubleshoot the Frequency

Input Module

Specifications

Schematics

Table of Contents – FLEX I/O Frequency Input Module toc–iii

Chapter 6

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Diagnostic Bits in Word 5 of the BTR File . . . . . . . . . . . . . . . . . . . . 6-3

What’s Next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Appendix A

What This Appendix Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Resolution and Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Appendix B

What This Appendix Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

Input Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

Frequency Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

Gate Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

Output Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2

Digital Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2

DC to DC Converters (24V dc power supplies) . . . . . . . . . . . . . . . .B-3

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Publication 1794-6.5.11 - November 1997

What This Chapter

Contains

How You Use the

Frequency Input Module

Chapter

Overview of the Frequency

Input Module

Read this chapter to familiarize yourself with the 1794-IJ2 module.

For information on See page

How You Use the Module . . . . . . . . . . . . . . . . . . . . . . . .

1-1

What the Frequency Input Module Does . . . . . . . . . . . . .

1-2

Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

Input Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-4

Selecting the Mode(s) of Operation . . . . . . . . . . . . .

1-4

Output Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-5

Implementing Application Features . . . . . . . . . . . . .

1-5

How Frequency is Calculated

1-5

The 1794-IJ2 module is an intelligent I/O module designed to perform high-speed frequency algorithms. The module provides:

• 2 Frequency Inputs,

• 2 Gate Inputs and

• 2 Outputs.

The Frequency Inputs can accept frequencies up to 32,767 Hz. The module accepts and returns binary data.

The module measures frequency over a user-specified time interval. A frequency calculation can start before the time interval has elapsed, if a user-specified number of frequency input pulses have occurred.

The module’s primary use is accurate, high-speed frequency measurement. A high-speed internal clock is synchronized with the frequency input to count over a user-selected sampling time or a user-defined number of frequency input pulses.

All power for input devices (4 devices, 24 Vdc @ 15 mA max) is supplied by the I/O module.

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1-2

Inputs

Module

Overview of the Frequency Input Module

Gate Input Frequency Input

500/50mV

Magnetic

50mV

Select

GND

24VPower

IEC 1+/Contact

Input

24V IEC 1+

IEC 1+/Contact

Input

24V Power

GND

50mV

Select

500/50mV Vortex

3Vin 6Vin 24V Power

24V IEC 1+ Magnetic

VORTEX

Invert

Y/N

Invert

Y/N uP System 0

Input Control

Processing

Counter

Direction Data

Frequency / Count Data

Output Control

Inter-Processor

Communication, uP System 0/1 from uP System 1

CRISP

Bus Interface

Output 0 Output 1

Flexbus

What the Frequency Input

Module Does

Data To/From Flexbus

The frequency input module performs high-speed frequency and/or scaling calculation operations for various industrial applications. The module interfaces with a FLEX family adapter which then communicates with a programmable controller processor that has block-transfer capability and external I/O devices.

The adapter/power supply transfers data to the module (block transfer write) and from the module (block transfer read) using BTW and BTR instructions in your ladder diagram program. These instructions let the adapter read input values and status from the module, and let you write output values and configure the module’s mode of operation. The following illustration describes the communication process.

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Publication 1794-6.5.11 - November 1997

The adapter transfers your configuration data to the module using a BTW.

Overview of the Frequency Input Module

External devices transmit frequency signals to the module.

1 -3

Allen-Bradley

ADAPTER

ACTIVE FAULT

LOCAL

FAULT

Flexbus

24VDC

POWER SUPPLY

RIO ADAPTER

1794-ASB

Your ladder program instructs the adapter to perform a BTR of the values and stores them in a data table.

Allen-Bradley

FREQUENCY INPUT 2 CHANNEL

FREQ

GATE

0 F 1

FREQ

F 1

GATE

OUT

1794-IJ2

OUT

The adapter and module determine that the transfer was made without error and input values are within specified range.

Your ladder program can use and/or move the data (if valid) before it is written over by the transfer of new data in a subsequent transfer.

Your ladder program performs BTWs to the module when you power it up, and any time you wish to reconfigure the module.

Typical Applications

The module converts frequency signals into integer format and stores these values until the adapter requests their transfer.

You can use the 1794-IJ2 module in the power management, automotive, food and beverage, and oil and gas industries for various flow and/or turbine metering applications. Some sample applications include:

• turbine shaft speed monitoring

• automotive paint booths

• brewery flow monitoring

• petrochemical flow and custody transfer

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1-4 Overview of the Frequency Input Module

Input Capabilities

frequency input (F0-F1) - you connect your input device to this input (ac, proximity sensors switch, magnetic, vortex ) gate input (G0-G1) - you connect your input device to this input (ac, proximity sensors switch, magnetic, vortex )

used to determine direction - CW or CCW

FREQ

The frequency module has 2 input channels (mode dependent). Each of the 2 input channels may accept these input signals:

• magnetic pickup — 500mV to 28V ac peak (optional 50mV to

28V ac peak for increased signal sensitivity)

• proximity probe inputs

– compatible with Bently Nevada 3300 (5mm and 8mm) proximity transducer systems

– provides 1 isolated 24V dc power supply (2 channels rated at

30mA each) to power external devices

– vortex flowmeter – 6V and 3V

You configure the module’s 2 input channels for your specific application(s). Each input channel has two input selections:

Allen-Bradley

FREQUENCY INPUT 2 CHANNEL

1794-IJ2

2 input channels frequency input (F0) gate input (G0)

Channel 0 frequency input (F1) gate input (G1)

Channel 1

GATE

F 1

FREQ

F 1

GATE

OUT

Mode

Frequency and

% Full Scale

Frequency and

Acceleration

Selecting the Mode(s) of Operation

You configure the 1794-IJ2 module for these modes of operation:

Use this mode to:

• monitor the frequency of an input with high accuracy (e.g. shaft)

• monitor the percent of full scale frequency

• operate frequency alarm (% full scale)

• scale the frequency

• monitor the direction of shaft rotation

• wire-off alarm with dc devices

• missing pulse alarm

• monitor the frequency of an input with high accuracy (e.g. shaft)

• monitor the acceleration (rate of speed change)

• operate acceleration alarm (rate of change)

• scale the frequency

• monitor the direction of shaft rotation

• wire-off alarm with dc devices

• missing pulse alarm

√

Indicators/

Alarms

Scaler values

√

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Publication 1794-6.5.11 - November 1997

Overview of the Frequency Input Module 1 -5

Output Capabilities

The 1794-IJ2 module has 2 assignable outputs. These outputs are designed for applications that require fast response. The outputs:

• are current sourcing at 10-31.2V dc (1A maximum per output)

• are electrically fused/current limited to 3A

• can be assigned to the associated input channel with user-selectable frequency and acceleration values

• are isolated — this lets you use two separate external power supplies if desired (one for output 0 and one for output 1)

Implementing Application Features

You can use the module to implement programmable application features that are usually initiated by your PLC processor. This frees the PLC processor to do other tasks and helps increase the overall throughput of your PLC system.

This feature Is used in these modes To Alarm is ON when frequency alarm acceleration alarm scaling frequency alarm selected acceleration alarm selected

% full scale and acceleration activate alarm when calculated or scaled frequency is higher than user-specified frequency value.

frequency

user-specified value activate acceleration alarm when acceleration is greater than user-specified acceleration value.

 acceleration

 > user-specified value multiply and/or divide frequency by scalar frequency

user-specified scaled frequency value

How Frequency is

Calculated

The following paragraphs detail operation of the frequency input module algorithm and its modifying parameters.

Frequency Calculation

Frequency is determined by a general algorithm which can be modified by user defined parameters. In its simplest form, the algorithm employs the user defined Minimum Sampling Time to set a window in which to count pulses to determine the frequency. At least two pulses are required within the sample window. Frequency is determined by storing the time the first pulse occurred and then continually storing and updating the time of subsequent pulses, along with the number of pulses encountered. When the window expires, the frequency is calculated and the procedure repeats.

The sequence and formula for determining frequency are shown below.

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1-6 Overview of the Frequency Input Module

Normal Mode Frequency Determination, at Least Two Pulses in Sampling Time

Missing Pulse Alarm Would be Reported

After 2 Seconds, If No Pulse Occurs

Frequency Reported at End Sampling Time

= pulses counted - 1

T2 - T1

Minimum Sampling Time

Frequency Input

Pulses pulses counted first pulse in window,

T1 time stored

T2, update as each pulse occurs last pulse in window

If only one pulse occurs within the sampling window, when the sample time has expired, the window is extended to 2 seconds to allow for a second pulse to occur. As soon as a second pulse occurs, the frequency is calculated and the procedures starts over. If no second pulse is detected, zero frequency is reported and a Missing Pulse Alarm is generated. The following figure depicts this situation.

Normal Mode, Only One Pulse in Sampling Time, Sampling Time Extended

Frequency Reported at

First Pulse in Extended Time =

2 - 1

T2 - T1

Missing Pulse Alarm Would be Reported After 2 Seconds, If No Pulse Occurs

Minimum Sampling Time

Sampling Time Extended to 2 Seconds

2 = pulses counted

Frequency Input

Pulses first pulse in window,

T1 time stored first pulse after window extended,

T2 time stored

Termination on Number of Pulses

The normal mode is designed to provide wide bandwidth. However, it requires the full 2 seconds to report a missing pulse. Another user parameter, Number of Pulses to Terminate Sampling, is provided for those situations where many pulses are expected within the sampling window, such that early determination of frequency is possible.

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Publication 1794-6.5.11 - November 1997

Overview of the Frequency Input Module 1 -7

During normal operation, there is a sufficient number of pulses to prevent the module from entering the 2 second extension mode. Once the user defined number of pulses is reached within the sampling window, the frequency is immediately reported.

If the sampling window was extended to 2 seconds while waiting for a second pulse to occur, a situation which can occur during system startup, the module will not wait for the number of pulses to be reached. Instead, as soon as a second pulse occurs, the frequency will be calculated based on the time between the 2 pulses, and the procedure starts over.

Termination on Number of Pulses

Frequency Reported at

Number of Pulses to Terminate Reached =

Pulses to Terminate - 1

T2 - T1

Missing Pulse Alarm Would be Reported After 2 Seconds, If No Pulse Occurs

Minimum Sampling Time pulses to terminate

Frequency Input

Pulses first pulse in window,

T1 time stored

T2, update as each pulse occurs number of pulses to terminate reached

Missing Pulse Multiplier

The last user parameter which is provided to modify the frequency algorithm is the Missing Pulse Multiplier. In this case, the user can set the number of Minimum Frequency Sampling Time windows they will allow to extend the time to capture a second pulse, before reporting a Missing

Pulse Alarm. The intent with this parameter is to allow a tradeoff of the bandwidth available with the response time to report a missing pulse. This mechanism is shown in the following figure.

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1-8 Overview of the Frequency Input Module

Missing Pulse Multiplier

Frequency Reported at

First Pulse in Extended Time =

2 - 1

T2 - T1

Missing Pulse Alarm Would be Reported After Last Window, If No Pulse Occurs extended windows added one at time, until pulse occurs or multiplied windows exceeded

Minimum Sampling Time

2 = pulses counted possible extended window

Frequency Input

Pulses

2 x M first pulse in window,

T1 time stored first pulse in an extended window,

T2 time stored

Direction Detection

Direction detection is accomplished by using the Frequency input, Gate input, and two sensors. The module expects to see a Low to High transition on the Frequency input, followed by a Low to High transition on the Gate input. This assumes both input polarity select bits are the same selection.

This corresponds to Clockwise rotation (see figure). If a Low to High transition occurs on the Gate input, followed by one on the Frequency input, the rotation is CounterClockwise.

Direction Detection - Principle of Operation

Clockwise Rotation

Sensor 0

Sensor 1

Gate Input

IJ2 Module

Frequency Input

Sensor 0 (F)

Sensor 1 (G)

Clockwise

Rotation

Sensor 0 (F)

Sensor 1 (G)

Counter

Clockwise

Rotation

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

Chapter Summary

Overview of the Frequency Input Module 1 -9

In this chapter, you learned about the frequency input module, block transfer communication, and details of how the module functions. Now you can install the module.

Install the

IJ2 Module

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1-10 Overview of the Frequency Input Module

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

What This Chapter

Contains

Before You Install Your

Input Module

European Union Directive

Compliance

Chapter

How to Install Your Frequency

Input Module

In this chapter, we tell you about:

For information on See page

Before You Install Your Module . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

European Union Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Installing the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 on a DIN rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

on a wall/panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

on the terminal base. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Connecting Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Module Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Before installing your frequency input module in the FLEX I/O system:

You need to: As described under:

Calculate the power requirements of all modules in each FLEX system.

Power Requirements, page 2-2

Position the keyswitch on the terminal base

Installing the Module, page 2-4

ATTENTION: The frequency input module does not receive power from the backplane.

24V dc power must be applied to your module before installation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis.

If this product has the CE mark it is approved for installation within the

European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

This product is tested to meet Council Directive 89/336/EEC

Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file:

• EN 50081-2EMC – Generic Emission Standard, Part 2 – Industrial

Environment

• EN 50082-2EMC – Generic Immunity Standard, Part 2 – Industrial

Environment

Publication 1794-6.5.11 - November 1997

2-2 How to Install Your Frequency Input Module

Power Requirements

This product is intended for use in an industrial environment.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61131-2 Programmable

Controllers, Part 2 – Equipment Requirements and Tests.

For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:

• Industrial Automation Wiring and Grounding Guidelines For Noise

Immunity, publication 1770-4.1

• Guidelines for Handling Lithium Batteries, publication AG-5.4

• Automation Systems Catalog, publication B111

This equipment is classified as open equipment and must be mounted in an enclosure during operation to provide safety protection.

The wiring of the terminal base unit is determined by the current draw through the terminal base. Make certain that the current draw does not exceed 10A.

ATTENTION: Total current draw through the terminal base unit is limited to 10A. Separate power connections may be necessary.

The frequency input module requires 30mA at 5V dc from the flexbus backplane.

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

How to Install Your Frequency Input Module

Methods of wiring the terminal base units are shown in the illustration below.

Wiring the Terminal Base Units (1794-TB3G shown)

ATTENTION: Do not daisy chain power or ground from the terminal base unit to any ac or dc digital module terminal base unit.

2 -3

Daisy-chaining

Frequency Input

Module

Frequency Input

Module

TC/RTD/mV

Module

Frequency Input

Module

Individual

24V dc Note: All modules must be frequency or TC/RTD/mV modules for this configuration.

Wiring when total current draw is less than 10A

Digital Input

Module

Frequency Input

Module

Digital Input

Module

Digital Output

Module

24V dc

Note: Use this configuration if using any

"noisy" dc digital I/O modules in your system.

Frequency Input Module wiring separate from digital wiring.

Wiring when total current draw is greater than 10A

Combination

Frequency Input

Module

Frequency Input

Module

TC/RTD/mV

Module

Frequency Input

Module

24V dc

Note: All modules powered by the same power supply must be frequency or TC/RTD/mV modules for this configuration.

Total current draw through any base unit must not be greater than 10A

Publication 1794-6.5.11 - November 1997

2-4 How to Install Your Frequency Input Module

Installing the Module

Installation of the frequency input module consists of:

• mounting the terminal base unit

• installing the module into the terminal base unit

• installing the connecting wiring to the terminal base unit

If you are installing your module into a terminal base unit that is already installed, proceed to “Mounting the Frequency Input Module on the

Terminal Base” on page 2-7.

Mounting the Terminal Base Unit on a DIN Rail

ATTENTION: Do not remove or replace a terminal base unit when power is applied. Interruption of the flexbus can result in unintended operation or machine motion.

1. Remove the cover plug (if used) in the male connector of the unit to which you are connecting this terminal base unit.

2. Check to make sure that the 16 pins in the male connector on the adjacent device are straight and in line so that the mating female connector on this terminal base unit will mate correctly.

3. Position the terminal base on the 35 x 7.5mm DIN rail A (A-B pt. no.

199-DR1; 46277-3) at a slight angle with hook B on the left side of the terminal base hooked into the right side of the unit on the left.

Proceed as follows:

Position terminal base at a slight angle and hooked over the top of the DIN rail.

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

How to Install Your Frequency Input Module 2 -5

Slide the terminal base unit over tight against the adapter.

Make sure the hook on the terminal base slides under the edge of the adapter and the flexbus connector is fully retracted.

Press down on the terminal base unit to lock the terminal base on the

DIN rail. If the terminal base does not lock into place, use a screwdriver or similar device to open the locking tab, press down on the terminal base until flush with the DIN rail and release the locking tab to lock the base in place.

30077-M

Gently push the flexbus connector into the side of the adapter to complete the backplane connection.

Publication 1794-6.5.11 - November 1997

2-6 How to Install Your Frequency Input Module

4. Repeat the above steps to install the next terminal base.

Panel/Wall Mounting

Installation on a wall or panel consists of:

• laying out the drilling points on the wall or panel

• drilling the pilot holes for the mounting screws

• mounting the adapter mounting plate

• installing the terminal base units and securing them to the wall or panel

If you are installing your module into a terminal base unit that is already installed, proceed to “Mounting the Frequency Input Module on the

Terminal Base” on page1.

Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.

1.4

(35.5)

1794-NM1 Mounting Kit

Contents:

1 - Mounting Plate for Adapter

2 - 18 #6 self-tapping screws

(2 for the adapter, and 2 each for up to 8 modules)

Adapter Module

(not included)

Terminal Base Unit

(not included)

To install the mounting plate on a wall or panel:

1. Lay out the required points on the wall/panel as shown in the drilling dimension drawing.

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

Inches

(Millimeters)

How to Install Your Frequency Input Module

1.4

(35.5)

Drilling Dimensions for Panel/Wall Mounting of FLEX I/O

2.3

(58.5)

1.4

(35.5)

2.3

(58.5)

1.4

(35.5)

.83 (21)

2 -7

2. Drill the necessary holes for the #6 self-tapping mounting screws.

3. Mount the mounting plate (1) for the adapter module using two #6 self-tapping screws (18 included for mounting up to 8 modules and the adapter).

Important: Make certain that the mounting plate is properly grounded to the panel. Refer to “Industrial Automation Wiring and

Grounding Guidelines,” publication 1770-4.1.

4. Hold the adapter (2) at a slight angle and engage the top of the mounting plate in the indention on the rear of the adapter module.

5. Press the adapter down flush with the panel until the locking lever locks.

6. Position the terminal base unit up against the adapter and push the female bus connector into the adapter.

7. Secure to the wall with two #6 self-tapping screws.

8. Repeat for each remaining terminal base unit.

Note: The adapter is capable of addressing eight modules. Do not exceed a maximum of eight terminal base units in your system.

Mounting the Frequency Input Module on the Terminal Base

Unit

The Frequency input module mounts on a 1794-TB3G or TB3GS terminal base unit.

1. Rotate the keyswitch (1) on the terminal base unit (2) clockwise to position 1 as required for the frequency input module.

Publication 1794-6.5.11 - November 1997

2-8 How to Install Your Frequency Input Module

2. Make certain the flexbus connector (3) is pushed all the way to the left to connect with the neighboring terminal base/adapter. You cannot install the module unless the connector is fully extended.

3. Make sure that the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit.

ATTENTION: Remove field-side power before removing or inserting the module. This module is designed so you can

remove and insert it under backplane power. When you remove or insert a module with field-side power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:

• sending an erroneous signal to your system’s field devices causing unintended machine motion

• causing an explosion in a hazardous environment

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector.

Worn contacts may create electrical resistance.

4. Position the module (4) with its alignment bar (5) aligned with the groove (6) on the terminal base.

5. Press firmly and evenly to seat the module in the terminal base unit.

The module is seated when the latching mechanism (7) is locked into the module.

6. Repeat the above steps to install the next module in its terminal base unit.

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Publication 1794-6.5.11 - November 1997

Connecting Wiring for Your

Frequency Input Module

How to Install Your Frequency Input Module 2 -9

Wiring to the module is made through the terminal base unit on which the module mounts.

Compatible terminal base units are:

Module

1794-IJ2

1794-TB3G

Yes

1794-TB3GS

Yes

1794-TB3G 1794-TB3GS

1 2

3 4 5 6 7

18 19 20 21 22 23

35 36 37 38

9 10 11 12 13 14 15

25 26 27 28 29 30 31 32

39 40 41 42 43 44 45 46 47 48 49 50

Label placed at top of wiring area.

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

A 0 -15 A

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

B 16-33 B

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

C 34-51 C

34 and 50 = 24V dc

35 and 51 = common

16 and 33 = chassis ground

40 thru 45 = chassis ground

34 and 50 = 24V dc

35 and 51 = common

16 and 33 = chassis ground

40 thru 45 = chassis ground

0 1 2

Connections for Terminal Base 1794-TB3G shown

3 4 5 6 7 8 9 10 11 12 13 14 15

24V

Pwr

RET 50 mV

Sel

500/50 mV

Channel 0 Frequency Input

F 24V

Pwr

24V

Pwr

F 500/50 mV

50 mV

Sel

RET 24V

Pwr

Channel 1 Frequency Input

20 21 22 23 24 25 26 27 28 29 30 31 32 33

Chassis Gnd

Out 0 Out 0

Ret

RET 50 mV

Sel

500/50 mV

Channel 0 Gate Input

35 36 37

G 24V

Pwr

24V

Pwr

G 500/50 mV

50 mV

Sel

Channel 1 Gate Input

RET Out 1 Out 1

Ret

Chassis Gnd

38 39 40 41 42 43 44 45 46 47 48 49 50 51

+V COM

24V dc

Supply In

Sply 0

Gnd

Sply 0

Ret

Channel 0 Output Supply

6 Chassis Ground for Shields

Sply 1

Gnd

Sply 1

Ret

+V COM

Channel 1 Output Supply

24V dc

Supply Out

Publication 1794-6.5.11 - November 1997

2-10 How to Install Your Frequency Input Module

Connecting Wiring using a 1794-TB3G and –TB3GS Terminal

Base Units

1. Connect the individual signal wiring to the proper numbered terminals on the 0-15 row (A) and 16-33 row (B) on the terminal base unit. Connect the inputs as shown in the table on page 1.

2. Connect output signal and supply wiring to the numbered terminals on rows B and C, as shown in the wiring connection on page 1.

3. Terminate shields to terminals 16 or 33 on row B, or 40 through 45 on row C.

4. Connect

24V dc to terminal 34 on the 34-51 row (C), and 24V common to terminal 35 on the 34-51 row (C).

ATTENTION: To reduce susceptibility to noise, power frequency modules and digital modules from separate power supplies. Do not exceed a length of 33 ft (10m) for dc power cabling.

5. If daisy chaining the

24V dc power to the next 1794-TB3G or

-TB3GS base unit, connect a jumper from terminal 50 (

24V) on this base unit to terminal 34 and from terminal 51 (24V dc common) to terminal 35 on the next 1794-TB3G or -TB3GS base unit.

NOTE: Use extreme care when connecting wiring to an adjacent terminal base unit. Wiring for the 1794-TB3G and -TB3GS terminal base units is different from other 1794 terminal base units.

ATTENTION: Do not daisy chain power or ground from the 1794-TB3G or -TB3GS terminal base unit to any ac or dc digital module terminal base unit.

ATTENTION: This module does not receive power from the backplane.

24V dc power must be applied to your module before operation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis. If the adapter does not recognize your module after installation is completed, cycle power to the adapter.

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Publication 1794-6.5.11 - November 1997

How to Install Your Frequency Input Module 2 -11

Wiring connections for the 1794-IJ2 Frequency Input Module

Channel 0 Terminals

Power Input RET

Channel 1 Terminals

Power Input RET

Types of Inputs

Frequency

24V dc IEC1+ Proximity

1, 2

24V dc Contact Switch

500mV ac Magnetic Pickup

50mV ac Magnetic Pickup

6V ac Vortex

3V ac Vortex

Gate

24V dc IEC1

Proximity

1, 2

24V dc Contact Switch

500mV ac Magnetic Pickup

50mV ac Magnetic Pickup

As defined by standard IEC 1131-2.

RET not used on 2-wire devices

Add external resistor from 24V to F or G for wire-off detection (0.4mA) – (

≈

50K

Ω

)

Add a jumper between 50mV and RET (Frequency – channel 0 = 4 to 3; channel 1 = 11 to 12)

(Gate – channel 0 = 21 to 20; channel 1 = 28 to 29)

Connect cable shields to GND terminals.

All 4 RET terminals (ch 0 and 1, Freq, Gate) are internally connected together.

24V terminal may not be used on 2-wire magnetic devices

GND

Channel 0 Terminals

Channel 1 Terminals

Output Alarm

Connections

Sply +

Sply

RET

Supply Connection 37

Output Connection

Connect cable shields to GND connections.

Out

RET

Sply +

46 48

Sply

RET

Out

RET

ATTENTION: Total current draw through the terminal base unit is limited to 10A. Separate power connections to the terminal base unit may be necessary.

Publication 1794-6.5.11 - November 1997

2-12 How to Install Your Frequency Input Module

Examples of Wiring to a 1794-TB3G Terminal Base Unit

Standard Magnetic Pickup

500mV threshold (F0)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Standard Magnetic Pickup

50mV threshold (F0)

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Important: When using a channel for 50mV sensor, jumper the

50/500mV pin to the appropriate

RET.

Magnetic

Input

Device -

+ Magnetic

Input

Device

24V dc IEC 1+ Proximity

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

6V Vortex Flowmeter

Power

Input

Device

6V Vortex

Flowmeter

Standard Output (O0)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

24V dc Contact Switch

Add external resistor from 24V to F or G for wire-off detection.

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Power

External

Power Supply #1

10-31.2V dc @ 1A

LOAD 0 18

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Publication 1794-6.5.11 - November 1997

Module Indicators

Chapter Summary

How to Install Your Frequency Input Module 2 -13

The Frequency Input module has one status indicator (PWR) that is on when power is applied to the module, one fault indicator (F) for each input, and an input status indicator for each input (0 or 1) and an output indicator for each output (0 or 1).

Allen-Bradley

FREQUENCY INPUT 2 CHANNEL

1794-IJ2

FREQ

GATE

F 1

FREQ

B C

GATE

OUT

A = Input indicators for each input channel.

B = Insertable label for writing individual I/O assignments.

C = Wire-off Fault indicators for each input channel.

D = Output indicators for each output channel.

E = Power/status indicator – indicates power applied to module and status of module.

Indicator

Input (0 or 1)

Frequency or Gate

Fault (F)

Frequency or Gate

Indication

Off/Dark

On/Yellow

Off/Dark

On/Red flash

Output Alarm (0 or 1) Off/Dark

On/Yellow

Module Power (OK) Off/Dark

Solid Green

Solid Red

Description

Input turned off, input not used, wire disconnected

Input turned on

Wire connected, normal operation

Wire disconnected, fault condition (for IEC 1

or switch contacts with shunt resistor)

Output turned off

Output turned on (logic drive on)

24V power off, or 5V logic power problem

Module OK, normal operating mode

Module fault, outputs disabled

In this chapter, we told you how to install your input module in an existing programmable controller system and how to wire to the terminal base units.

Publication 1794-6.5.11 - November 1997

What This Chapter

Contains

Enter Block Transfer

Instructions

Chapter

Programming Your Frequency

Input Module

To initiate communication between the frequency input module and your

PLC processor, you must enter block transfer instructions into your ladder logic program. Use this chapter to enter the necessary block transfer instructions into your ladder logic program.

To edit your ladder logic you See page

Enter Block Transfer Instructions. . . . . . . . . . . . . . . . . . . . . . . . 3-1

PLC-2 Family Processors . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

PLC-3 Family Processors . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

PLC-5 Family Processors . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

PLC-5/250 Processors . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

The frequency input module communicates with the PLC processor through bidirectional block transfers. This is the sequential operation of both read and write block transfer instructions.

Before you configure the module, you need to enter block transfer instructions into your ladder logic. The following example programs illustrate the minimum programming required for communication to take place between the module and a PLC processor. These programs can be modified to suit your application requirements.

A configuration block transfer write (BTW) is initiated when the frequency module is first powered up, and subsequently only when the programmer wants to enable or disable features of the module. The configuration BTW sets the bits which enable the programmable features of the module, such as scalars and alarm values, etc. Block transfer reads are performed to retrieve information from the module.

Block transfer read (BTR) programming moves status and data from the module to the processor’s data table. The processor user program initiates the request to transfer data from the module to the processor. The transferred words contain module status, channel status and input data from the module.

Your program should monitor status bits, block transfer read and block transfer write activity.

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Publication 1794-6.5.11 - November 1997

3-2 Programming Your Frequency Input Module

PLC-2 Family Processor

The 1794 frequency I/O module is not recommended for use with PLC-2 family programmable controllers due to the number of digits needed for high resolution.

Important: The frequency input module functions with reduced performance in PLC-2 systems. Because the module does not support BCD and the PLC-2 processor is limited to values of 4095 (12 bit binary), many values returned in the

BTR file may not provide meaningful data to the PLC-2 processor.

PLC-3 Family Processor

Block transfer instructions with the PLC-3 processor use a control file and a data file. The block transfer control file contains the data table section for module location, the address of the block transfer data file and other related data. The block transfer data file stores data that you want transferred to the module (when programming a BTW) or from the module (when programming a BTR).

The programming terminal prompts you to create a control file when a block transfer instruction is being programmed. The same block transfer

control file is used for both the read and write instructions for your

module. A different block transfer control file is required for every module.

Publication 1794-6.5.11 - November 1997

Programming Your Frequency Input Module 3 -3

PLC-3 Processor

Program Example

Rung M:0

The IJ2 module is located in rack 3, I/O group 2, slot 0. The control file is a 10 word file starting at B17:0 that is shared by the BTR/BTW. The data obtained by the PLC3 processor is placed in memory starting at location N18:101, and with the default length of 0, is 7 words long.

IJ2 BTR

Done Bit

B17:0

IJ2 BTR/BTW

Control Block

BTR

BLOCK TRANSFER READ

Rack

Group

Slot

Control

Data File

Length

B17:0

N18:101

IJ2 BTR

Error Bit

B17:0

IJ2 BTR

Error Bit

B17:0

The IJ2 module is located in rack 3, I/O group 2, slot 0. The control file is a 10 word file starting at B17:0 that is shared by the BTR/BTW. The data sent by the PLC-3 processor to the IJ2 module is from PLC memory starting at N18:1, and with the default length of 0, is 8 words long.

IJ2 BTW

Done Bit

B17:0

IJ2 BTR/BTW

Control Block

BTW

BLOCK TRANSFER WRITE

Rack

Group

Slot

Control

Data

Length

B17:0

N18:1

IJ2 BTW

Error Bit

B17:0

IJ2 BTW

Error Bit

B17:0

PLC-5 Family Processor

Block transfer instructions with the PLC-5 processor use a control file and a data file. The block transfer control file contains the data table section for module location, the address of the block transfer data file and other related data. The block transfer data file stores data that you want transferred to the module (when programming a BTW) or from the module (when programming a BTR).

The programming terminal prompts you to create a control file when a block transfer instruction is being programmed. A different block

transfer control file is used for the read and write instructions for

your module.

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Publication 1794-6.5.11 - November 1997

3-4 Programming Your Frequency Input Module

PLC-5 Processor

Program Example

Rung 2:0

The IJ2 module is located in rack 1, I/O group 2, slot 0. The integer control file starts at N22:200, is 5 words long and is compatible with all PLC-5 family members. The data obtained by the PLC-5 processor from the IJ2 module is placed in memory starting at N22:101, and with the default length of 0, is 7 words long. The length can be any number between 0

1 and 7. In enhanced PLC-5 processors , the block transfer data type may be used as a control file.

IJ2 BTR

Enable Bit

N22:200

IJ2 BTW

Enable Bit

N22:205

IJ2 BTR

Control File

BTR

BLOCK TRANSFER READ

Rack

Group

Slot

Control

Data File

Length

Continuous

N22:200

N22:101

Rung 2:1

The IJ2 module is located in rack 1, group 2, slot 0. The integer control file starts at N22:205, is a 5 words long and is compatible will all PLC-5 family members. The data sent by the PLC-5 processor to the IJ2 module starts at N22:1, and with the default

1 length of 0, is 8 words long. Valid BTW lengths can be any number from 0 to 8. In enhanced PLC-5 processors , the block transfer data type may be used as a control file.

IJ2 BTR

Enable Bit

N22:200

IJ2 BTW

Enable Bit

N22:205

IJ2 BTW

Control File

BTW

BLOCK TRANSFER WRITE

Rack

Group

Slot

Control

Data File

Length

Continuous

N22:205

N22:1

Enhanced PLC-5 processors include: PLC-5/11, -5/20, -5/3x, -5/4x, and -5/6x.

PLC-5/250 Processor

Block transfer instructions with the PLC-5/250 processor use a control file and a data file. The block transfer control file contains the data table section for module location, the address of the block transfer data file and other related data. The block transfer data file stores data that you want transferred to the module (when programming a BTW) or from the module (when programming a BTR).

The programming terminal will automatically select the control file based on rack, group and module, and whether it is a read or write. A different

block transfer control file is used for the read and write instructions

for your module. A different block transfer control file is required for every module.

Publication 1794-6.5.11 - November 1997

Programming Your Frequency Input Module 3 -5

PLC-5/250 Processor

Program Example

Rung 1STEPO:1

The IJ2 module is located in rack 14, I/O group 1, slot 0. The data obtained by the PLC-5/250 processor from the

IJ2 module is placed in the data table starting at 2BTD5:101, and with the default length of 0, is 7 words long. The length can be any number between 0 and 7.

IJ2 BTR

Enable Bit

BR141:0

IJ2 BTW

Enable Bit

BW141:0

IJ2 BTR

Control File

BTR

BLOCK TRANSFER READ

Rack

Group

Slot

Control Block

Data File

BT Length

Continuous

BT Timeout

BR141:0

2BTD5:101

Rung 1STEPO:1

The IJ2 module is located in rack 14, I/O group 1, slot 0. The data sent to the IJ2 module from the PLC-5/250 processor is from the data table starting at 2BTD5:1, and with a default length of 0, is 8 words long.

Valid BTW lengths can be any number between 0 and 8.

IJ2 BTR

Enable Bit

BR141:0

IJ2 BTW

Enable Bit

BW141:0

IJ2 BTW

Control File

BTW

BLOCK TRANSFER WRITE

Rack

Group

Slot

Control Block

Data File

BT Length

Continuous

BT Timeout

BW141:0

2BTD5:1

Chapter Summary

In this chapter, you learned how to program your IJ2 input module using block transfer instructions and ladder logic. Now, you can configure your module.

Configure the

IJ2 Module

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Publication 1794-6.5.11 - November 1997

3-6 Programming Your Frequency Input Module

Publication 1794-6.5.11 - November 1997

What This Chapter

Contains

Configuring Your

Frequency Input Module

Chapter

Writing Configuration to and

Reading Status from Your Module with a Remote I/O Adapter

In this chapter, we tell you about:

For information on See page

Configuring Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Reading Data from Your Module . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Mapping Data for the Module . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Frequency Input Module (1794-IJ2) Image Table Mapping. . . . . 4-2

Block Transfer Read Word Assignments . . . . . . . . . . . . . . . . . . 4-3

Bit/Word Definitions for Block Transfer Read Words. . . . . . . . . . 4-3

Block Transfer Write Word Assignments . . . . . . . . . . . . . . . . . . 4-5

Bit/Word Definitions for the Block Transfer Write Words . . . . . . 4-6

The frequency module is configured using a group of data table words that are transferred to the module using a block transfer write instruction.

Some of the software configurable features available are:

• frequency range

• number of pulses to sample

• sampling time

• safe states

• fault modes

• alarms

Configure your module for its intended operation by means of your programming terminal and write block transfers.

Note: Programmable controllers that use 6200 software (release 4.2 or higher) programming tools can take advantage of the IOCONFIG

Addendum utility to configure this module. IOCONFIG Addendum uses menu-based screens for configuration without having to set individual bits in particular locations. Refer to your 6200 software literature for details.

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4-2

Module

Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

Reading Data From Your

Mapping Data for the

I/O Image

Input Size

1 to 6 Words

Output Size

0 to 7 Words

Important: It is strongly recommended that you use IOCONFIG

Addendum to configure this module. The IOCONFIG

Addendum utility greatly simplifies configuration. If the

IOCONFIG Addendum is not available, you must enter data directly into the data table. Use this chapter as a reference when performing this task.

During normal operation, the processor transfers from 1 to 8 words to the module when you program a BTW instruction to the module’s address.

Read programming moves status and data from the frequency input module to the processor’s data table in one I/O scan. The processor’s user program initiates the request to transfer data from the frequency input module to the processor.

The following read and write words and bit/word descriptions describe the information written to and read from the frequency input module. The module uses up to 6 words of input data and up to 7 words of output data.

Each word is composed of 16 bits.

Frequency Input Module (1794-IJ2) Image Table Mapping

DIR

Module Image

Frequency Channel 0

% Full Scale or Acceleration Channel 0

Frequency Channel 1

% Full Scale or Acceleration Channel 1

F/A

Reserved

MPA

R R

DIR

F/A

Diagnostics

MPA

CF SSM

NOPTS

MPM

R LF

NOPTS

Minimum Freq or Absolute Value of Acceleration Channel 0

MPM

WOFG

Frequency Scaling Divisor Channel 0

WOFF

IGI

IFI

MFST

UP0

Frequency Scaling Multiplier Channel 0

ACT 0

F/A

AS0

Minimum Freq or Absolute Value of Acceleration Channel 1

MPDM

WOFM

WOFG

Frequency Scaling Divisor Channel 1

WOFF

IGI

IFI

MFST

UP1

Frequency Scaling Multiplier Channel 1

ACT 1

F/A

AS1

MPDM

WOFM

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Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 4 -3

Block Transfer Read Word Assignments for the Frequency Input

Module (1794-IJ2)

(Octal Bit) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Where:

R R

GS = Gate state

F/A = Frequency/Accel alarm

WO = Wire-off alarm

MPA = Missing pulse alarm

R = Reserved

Frequency 0 – 32,767 or 0.0 – 3,276.7 Channel 0

% Full Scale 0.0% to 3,276.7% Channel 0 or Acceleration –32,768 to +32,767 Channel 0

Frequency 0 – 32,767 or 0.0 – 3,276.7 Channel 1

% Full Scale 0.0% to 3,276.7% Channel 1 or Acceleration –32,768 to +32,767 Channel 1

Direction

Ch 0

GS Ch

F/A Ch

Ch 0

Reserved

MPA

Ch 0

R R

Direction

Ch 1

GS Ch

F/A Ch

Ch 1

Diagnostic Status

MPA

Ch 1

Word

Read

Word 0

Word 1

Word 2

Word 3

Bit/Word Definitions for Block Transfer Read Words for the Frequency Input

Module

Bit

Bit 00-15

(00-17)

Bit 00-15

(00-17)

Bit 00-15

(00-17)

Bit 00-15

(00-17)

Definition

Calculated value of Frequency (channel 0) – Frequency can be reported down to 1 or 1.0 Hz, depending on the

Frequency Range bit setting; below a 1 Hz value, 0 is reported; below a 1.0 Hz value, 0.0 is reported. Calculated frequency depends on Minimum Sampling Time and Missing Pulse Multiplier.

% of Full Scale or Acceleration (channel 0) – Value of the calculated Frequency scaled by the Maximum Frequency, or Calculated Value of Acceleration in Hz / second, depending on the state of the Freq or Accel Alarm Select bit.

Note: % Full scale will be calculated accurately up to a maximum of 3,276.7%. Beyond this maximum, the value of

3,276.7% will be returned, and a “Calculation Failure” (9) will be set in the Diagnostic Status byte.

Calculated value of Frequency (channel 1) – Frequency can be reported down to 1 or 1.0 Hz, depending on the

Frequency Range bit setting; below a 1 Hz value, 0 is reported; below a 1.0 Hz value, 0.0 is reported. Calculated frequency depends on Minimum Sampling Time and Missing Pulse Multiplier.

% of Full Scale or Acceleration (channel 1) – Value of the calculated Frequency scaled by the Maximum Frequency, or Calculated Value of Acceleration in Hz / second, depending on the state of the Freq or Accel Alarm Select bit.

Note: % Full scale will be calculated accurately up to a maximum of 3,276.7%. Beyond this maximum, the value of

3,276.7% will be returned, and a “Calculation Failure” (9) will be set in the Diagnostic Status byte.

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4-4 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

Word

Word 4

Bit Definition

Bits 00

Bit 01

Bit 02

Bit 03

Missing Pulse Alarm (channel 1) – Indicates when no Frequency input pulse has occurred within the period determined by the Minimum Frequency Sampling Time and the Missing Pulse Multiplier. Primary control is given to the Missing Pulse Multiplier to determine when this bit is set. However, if the Missing Pulse Multiplier is set to 0, then the Minimum Frequency Sampling Time characteristics will determine when this bit is set.

Wire Off Fault Alarm (channel 1) – when set, indicates when 24 Vdc Input (IEC 1+ or Switch Contact with shunt)

Wire Off Detection has gone true for any of the Frequency or Gate inputs on a channel that has the Wire Off Fault

Select = 1.

Frequency or Acceleration Alarm (channel 1) – Changes state from 0 to 1 if the calculated Frequency (actual or scaled) exceeds the user programmed Maximum Frequency, or the absolute value of calculated

Acceleration/Deceleration exceeds the user programmed Maximum Acceleration Value.

The Frequency Alarm turns off when the Frequency drops below 95% of the Alarm Value.

The Acceleration Alarm turns off when the Acceleration drops below 90% of the Alarm Value.

Gate Input State (channel 1) – Indicates if there is a valid signal on the gate input. This parameter is only determined once every 0.5 – 2s.

Bits 04-05

Direction (channel 1) – Indicates the current Direction of Rotation, using both the Frequency and Gate inputs.

(Frequency leads Gate = Clockwise, Gate leads Frequency = CounterClockwise). Used for slow speed detection from 1 – 1,500Hz. “No” or “Stopped” rotation can be determined by the state of the Missing Pulse Alarm, when it is switched on. A missing Frequency Input will generate a Missing Pulse Alarm, a missing Gate Input will only generate a “No Sensor Present / Detected” status (3).

Bits 06-07 Not used

Bits 08 (10)

Bit 09 (11)

Missing Pulse Alarm (channel 0) – Indicates when no Frequency input pulse has occurred within the period determined by the Minimum Frequency Sampling Time and the Missing Pulse Multiplier. Primary control is given to the Missing Pulse Multiplier to determine when this bit is set. However, if the Missing Pulse Multiplier is set to 0, then the Minimum Frequency Sampling Time characteristics will determine when this bit is set.

Wire Off Fault Alarm (channel 0) – When set, indicates when 24 Vdc Input (IEC 1+ or Switch Contact with shunt)

Wire Off Detection has gone true for any of the Frequency or Gate inputs on a channel that has the Wire Off Fault

Select = 1.

Bit 10 (12)

Bit 11 (13)

Bits 12-13

(14-15)

Frequency or Acceleration Alarm (channel 0) – Changes state from 0 to 1 if the calculated Frequency (actual or scaled) exceeds the user programmed Maximum Frequency, or the absolute value of calculated

Acceleration/Deceleration exceeds the user programmed Maximum Acceleration Value.

The Frequency Alarm turns off when the Frequency drops below 95% of the Alarm Value.

The Acceleration Alarm turns off when the Acceleration drops below 90% of the Alarm Value.

Gate Input State (channel 0) – Indicates if there is a valid signal on the gate input. This parameter is only determined once every 0.5 – 2s.

Direction (channel 0) – Indicates the current Direction of Rotation, using both the Frequency and Gate inputs.

Bits 14-15

(16-17)

Not used

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Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 4 -5

Word

Word 5

Bit Definition

Bits 00-03

Diagnostic Status – indicate the response from the module; a normal or non-normal operating condition.

Bit 03 02 01 00

0 = Normal Operation (No Failure)

1 = Calibration Failure

0 0 1 0

2 = Configuration Failure

A Minimum Frequency Sample Time value other than 0-9 was selected.

1 3 = Message Failure 0

1010-1111

4 = Lead Break Detection Hardware Failure

5 = Major Hardware Failure

0 6 = EEPROM Failure

1 7 = RAM Failure

0 8 = ROM Failure

9 = Calculation Failure

The actual Frequency is greater than 32,767 Hz. or 3,276.7 Hz. (overange).

The scaled Frequency is greater than 32,767 Hz. or 3,276.7 Hz. (overange).

The % Full Scale calculation (based on Maximum Frequency) is

3,276.7%.

10 – 15 = Not Used

Bits 04-15

(04-17)

Reserved

Block Transfer Write Word Assignments for the Frequency

Input Module

(Octal Bit) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Dec. Bit

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

CF SSM

Ch 0

Number Of Pulses To

Terminate Sampling

Ch 0

MPM

Ch 0

R LF

Ch 1

Number Of Pulses To

Terminate Sampling

Ch 1

MPM

Ch 1

Maximum Frequency 0 – 32,767 – or – 0.0 – 3,276.7 – or – Absolute Value of Acceleration 0 to 32,767 – Channel 0

WOFG

Ch 0

Frequency Scaling Divisor 0 – 255 Ch 0

WOFF

Ch 0

IGI

Ch 0

IFI

Ch 0

Minimum Frequency

Sample Time

Ch 0

Init St

Ch 0

Frequency Scaling Multiplier 0 – 255 Ch 0

ACT Ch 0

F/A AS

Ch 0

MPDM

Ch 0

WOFM

Ch 0

Maximum Frequency 0 – 32,767 – or – 0.0 – 3,276.7 – or – Absolute Value of Acceleration 0 to 32,767 – Channel 1

Frequency Scaling Divisor 0 – 255 Ch 1 Frequency Scaling Multiplier 0 – 255 Ch 1

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4-6 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

(Octal Bit)

Dec. Bit

WOFG

Ch 1

WOFF

Ch 1

IGI

Ch 1

IFI

Ch 1

13 12 11 10 07 06 05 04 03 02 01 00

11 10 09 08

Minimum Frequency

Sample Time

Ch 1

Init St

Ch 1

06 05

ACT Ch 1

F/A AS

Ch 1

03 02 01 00

MPDM

Ch 1

WOFM

Ch 1

Where: CF = Communication fault

SSM = Safe state mode

FR = Frequency Range

MPM = Missing Pulse Multiplier

LF = Local fault mode

F/AAS = Frequency/Accel alarm select

WOFF = Wire-off fault frequency

WOFG = Wire-off fault gate

WOFM = Wire-off fault mode

IGI = Invert gate input

IFI = Invert frequency input

ACT = Acceleration Calculation Time

MPDM = Missing pulse delay multiplier

R = Reserved

Word

Write

Word 0

Bit/Word Definitions for the Block Transfer Write Words for the

Frequency Input Module

Bit

Bits 00-01

Bits 02-04

Definition

Missing pulse multiplier bits (channel 1) – used to modify the Minimum Frequency Sampling Time to allow the frequency bandwidth to be more closely adjusted to the value needed to report the proper frequency and report a missing pulse more quickly.

Default = no multiplier; alarm generated immediately

Bit 01 00 Missing Pulse Multiplier

0 0 No Multiplier, normal mode with 2s delay

1 X2

0 X8

1 1 X32

Number of pulses to terminate sampling (channel 1) – Lets you calculate Frequency when a specified number of input pulses have occurred. This allows earlier reporting of the frequency than the Minimum Frequency Sampling Time, when many input pulses are occurring. Accurate frequency determination is possible without waiting for the full Minimum

Frequency Sampling Time to expire.

Defaul t = minimum frequency sampling time.

Bit 04 03 02 Number of pulses to terminate sampling

0 0 0 Use minimum frequency sampling time

128

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Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 4 -7

Word Bit Definition

Word 0 cont.

Bits 05

Bit 06

Bit 07

Bits 08-09

(10-11)

Bits 10-12

(12-14)

Bit 13 (15)

Bit 14 (16)

Frequency range bits (channel 1) – Specifies the Frequency Range of the Frequency input.

0 = 1-32767 (below 1Hz reports 0);

1 = 1.0-3276.7 (below 1.0Hz reports 0.0).

Default = 0

Local fault mode selection – determines how the Module Safe State data will be used to control alarm outputs for bus communication and internal module faults (local fault = Wire Off Fault or Missing Pulse Alarm).

0 = safe states activated by bus communication only;

1 = safe states activated by any failure (bus communication, internal module faults, etc.)

Default = 0, safe states activated by bus communication only

Not used

Missing pulse multiplier bits (channel 0)– used to modify the Minimum Frequency Sampling Time to allow the frequency bandwidth to be more closely adjusted to the value needed to report the proper frequency and report a missing pulse more quickly.

Default = no multiplier; alarm generated immediately

Bit

(11)

(10)

Minimum frequency sampling time

No Multiplier, alarm generated immediately (normal mode with 2s delay)

X32

Number of pulses to terminate sampling (channel 0) – Lets you calculate Frequency when a specified number of input pulses have occurred. This allows earlier reporting of the frequency than the Minimum Frequency Sampling Time, when many input pulses are occurring. Accurate frequency determination is possible without waiting for the full Minimum

Frequency Sampling Time to expire.

Defaul t = minimum frequency sampling time.

Bit

(14)

(13)

(12)

Number of pulses to terminate sampling

Use minimum frequency sampling time

128

Frequency range bits (channel 0) – Specifies the Frequency Range of the Frequency input.

0 = 1-32767 (below 1Hz reports 0);

1 = 1.0-3276.7 (below 1.0Hz reports 0.0).

Default = 0

Safe state mode bit – selection determines how module alarm outputs react to bus communication and internal module faults (local fault = Wire Off Fault or Missing Pulse Alarm).

0 = Reset outputs

1 = Hold last state

Default = 0 (reset outputs).

Bit 15 (17)

During normal startup, this bit must be set (1) by the user program to begin normal module operation of Alarm Outputs (in effect, an output enable). When the adapter communication link is broken, the adapter will reset this bit (0). – (Adapter dependent.)

Default = 0.

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4-8 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

Word

Word 1

Word 2

Word 3

Bit

Bits 00-15

(00-17)

Bits 00-07

Bits 08-15

(10-17)

Bits 00-01

Bits 02-03

Bit 04

Definition

Maximum frequency or absolute value acceleration/deceleration (channel 0) – Specifies the highest Frequency or absolute Acceleration/Deceleration value allowed on the Frequency input. 0-32,767, 0.0-3,276.7Hz. –OR– 0-32,767Hz/s depending on the Frequency Range and Frequency/Acceleration Alarm Select bits.

Frequency scaling multiplier (channel 0) – Specifies a multiplier to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling multiplication performed (x1)

Frequency scaling divisor (channel 0) – Specifies divisor to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling division performed (divided by 1)

Wire-Off/Missing Pulse fault select mode (channel 0) – Sets the mode for 24 Vdc IEC 1+ Wire Off Input Detection and

Missing Pulse Detection result for any input (Frequency or Gate). The Maximum Frequency is determined by Frequency

Range bit and the Maximum Frequency value, and the Minimum Frequency is determined by Frequency Range bit. The

Wire Off detect time (in mode 1, 2, & 3) is 2 seconds maximum.

Bit 01 00 Channel wire-off/missing pulse detection mode

0 0 Disabled

1 Alarm only (frequency unchanged)

Alarm and force frequency to maximum frequency value (32767 or 3276.7 or maximum frequency value, 0).

1 Alarm and force frequency to minimum frequency value (0 or 0.0).

Missing pulse delay multiplier bits (channel 0)– Specifies the number of Missing Pulse Alarms periods (Minimum

Frequency Sampling Times) which will be tolerated before the alarm is actually generated, if enabled. (Used to defeat the

Missing Pulse Alarm during a system startup.)

Default = 0 – No multiplier; alarm generated immediately (normal mode with 2s extension delay)

Bit 03 02 Alarm periods before alarm generated

0 0 No multiplier; alarm generated immediately (normal mode with 2s extension delay)

2 sample periods + 2s delay before alarm

8 sample periods + 2s delay before alarm

1 1 32 sample periods + 2s delay before alarm

Frequency or Acceleration Alarm Select (channel 0)– Determines if the value in the Maximum Frequency or Acceleration write word is a Frequency (actual or scaled) or Acceleration Alarm value. If set to Frequency, Acceleration is not calculated.

0 = frequency alarm

1 = acceleration alarm

Default = 0 – frequency alarm

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Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 4 -9

Word

Word 3

Bit

Bits 05-06

Bit 07

Bits 08-11

(10-13)

Definition

Acceleration Calculation Time (channel 0) – Specifies the number of Frequency Sample Times over which the module calculates acceleration.

Default = 0 – Rolling Average (previous 4 samples)

Bit 06 05 Acceleration Calculation Time in Frequency Sample Times

0 0 Rolling Average (previous 4 samples)

1 8

0 16

1 1 32

Initiate Startup Select (channel 0) – Alerts a channel that if process start up is in progress to defeat the missing pulse alarm for a time determined by the missing pulse delay multiplier.

0 = Normal Run Mode;

1 = Startup Mode – defeat/delay Missing Pulse Alarm

Default = 0 – Normal Run Mode

Minimum Frequency Sampling Time (channel 0) – Specifies the minimum time (in ms) the module will spend collecting pulses to determine the Frequency.

Bit

(13)

(12)

(11)

(10)

Minimum Frequency Sampling Time – in ms

100

200

500

1000

1010 to 1111 not used – 2ms default sample time used

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4-10 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

Word

Word 3 cont.

Word 4

Word 5

Bit

Bit 12 (14)

Bit 13 (15)

Bit 14 (16)

Bit 15 (17)

Bits 00-15

(00-17)

Bits 00-07

Bits 08-15

(10-17)

Definition

Invert Select – Frequency Input (channel 0) – Selects whether to invert the Frequency input signal, if not using an Active

High (24V = On) 24 Vdc IEC 1+ sensor or “Normally Open” relay or switch contact on the 24 Vdc Frequency Input terminal. Allows compatibility with an Active Low (0V = On) 24 Vdc IEC 1+ sensor or “Normally Closed” relay contact on the 24 Vdc Frequency Input terminal.

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On).

Default = 0 – Normal (Active High, 24V = On)

Invert Select – Gate Input (channel 0) – Selects whether to invert the Gate input signal, if not using an Active High (24V =

On) 24 Vdc IEC 1+ sensor or “Normally Open” relay or switch contact on the 24 Vdc Gate Input terminal. Allows compatibility with an Active Low (0V = On) 24 Vdc IEC 1+ sensor or “Normally Closed” relay contact on the 24 Vdc Gate

Input terminal.

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On)

Default = 0 – Normal (Active High, 24V = On)

Wire Off Fault Select – Frequency Input (channel 0) – Selects whether to turn On or Off the 24 Vdc Frequency input IEC 1+ hardware Wire Off (Lead Breakage) detection. NOTE: Customer devices must draw more than 0.4 mA in the On and Off

State. To use this feature with relays or switches, connect a “shunt resistor” (

∼

50K) across the contacts.

0 = Disable,

1 = Enable

Default : = 0 – Disable

Wire Off Fault Select – Gate Input (channel 0) – Selects whether to turn On or Off the 24 Vdc Gate input IEC 1+ hardware

Wire Off (Lead Breakage) detection. NOTE: Customer devices must draw more than.4 mA in the On and Off State. To use this feature with relays or switches, connect a “shunt resistor” (

∼

50K) across the contacts.

0 = Disable,

1 = Enable

Default = 0 – Disable

Maximum frequency or absolute value acceleration/deceleration (channel 1) – Specifies the highest Frequency or absolute Acceleration/Deceleration value allowed on the Frequency input. 0-32,767, 0.0-3,276.7Hz. –OR– 0-32,767Hz/s depending on the Frequency Range and Frequency/Acceleration Alarm Select bits.

Frequency scaling multiplier (channel 1) – Specifies a multiplier to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling multiplication performed (x1)

Frequency scaling divisor (channel 1) – Specifies divisor to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling division performed (divided by 1)

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Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 4 -11

Word

Word 6

Bit

Bits 00-01

Bits 02-03

Bit 04

Bits 05-06

Bit 07

Definition

Wire-Off/Missing Pulse fault select (channel 1) – Sets the mode for 24 Vdc IEC 1+ Wire Off Input Detection and Missing

Pulse Detection result for any input (Frequency or Gate). The Maximum Frequency is determined by Frequency Range bit and the Maximum Frequency value, and the Minimum Frequency is determined by Frequency Range bit. The Wire Off detect time (in mode 1, 2, & 3) is 2 seconds maximum.

Bit 01 00 Channel wire-off/missing pulse fault mode

0 0 Disabled

1 Alarm only (frequency unchanged)

Alarm and force frequency to maximum frequency value (32767 or 3276.7 or maximum frequency value, 0).

1 Alarm and force frequency to minimum frequency value (0 or 0.0).

Missing pulse delay multiplier bits (channel 1)– Specifies the number of Missing Pulse Alarms periods (Minimum

Frequency Sampling Times) which will be tolerated before the alarm is actually generated, if enabled. (Used to defeat the

Missing Pulse Alarm during a system startup.)

Default = 0 – No multiplier; alarm generated immediately (normal mode with 2s extension delay)

Bit 03 02 Alarm periods before alarm generated

0 0 No multiplier; alarm generated immediately (normal mode with 2s extension delay)

2 sample periods + 2s delay before alarm

8 sample periods + 2s delay before alarm

1 1 32 sample periods + 2s delay before alarm

Frequency or Acceleration Alarm Select (channel 1)– Determines if the value in the Maximum Frequency or Acceleration write word is a Frequency (actual or scaled) or Acceleration Alarm value. If set to Frequency, Acceleration is not calculated.

0 = frequency alarm

1 = acceleration alarm

Default = 0 – frequency alarm

Acceleration Calculation Time (channel 1) – Specifies the number of Frequency Sample Times over which the module calculates acceleration.

Default = 0 – Rolling Average (previous 4 samples)

Bit 06 05 Acceleration Calculation Time in Frequency Sample Times

0 0 Rolling Average (previous 4 samples)

1 1 32

Initiate Startup Select (channel 1) – Alerts a channel that if process start up is in progress to defeat the missing pulse alarm for a time determined by the missing pulse delay multiplier.

0 = Normal Run Mode;

1 = Startup Mode – defeat/delay Missing Pulse Alarm

Default = 0 – Normal Run Mode

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4-12 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

Word

Word 6

Bit

Bits 08-11

(10-13)

Bit 12 (14)

Bit 13 (15)

Bit 14 (16)

Bit 15 (17)

Definition

Minimum Frequency Sampling Time (channel 1) – Specifies the minimum time (in ms) the module will spend collecting pulses to determine the Frequency.

Bit

(13)

(12)

(11)

(10)

Minimum Frequency Sampling Time – in ms

0 20

1 50

0 100

1 200

0 500

1 1000

1010 to 1111 not used – 2ms default sample time used

Invert Select – Frequency Input (channel 1) – Selects whether to invert the Frequency input signal, if not using an Active

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On).

Default = 0 – Normal (Active High, 24V = On)

Invert Select – Gate Input (channel 1) – Selects whether to invert the Gate input signal, if not using an Active High (24V =

Input terminal.

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On)

Default = 0 – Normal (Active High, 24V = On)

Wire Off Fault Select – Frequency Input (channel 1) – Selects whether to turn On or Off the 24 Vdc Frequency input IEC 1+ hardware Wire Off (Lead Breakage) detection. NOTE: Customer devices must draw more than 0.4 mA in the On and Off

State. To use this feature with relays or switches, connect a “shunt resistor” (

∼

50K) across the contacts.

0 = Disable,

1 = Enable

Default : = 0 – Disable

Wire Off Fault Select – Gate Input (channel 1) – Selects whether to turn On or Off the 24 Vdc Gate input IEC 1+ hardware

Wire Off (Lead Breakage) detection. NOTE: Customer devices must draw more than.4 mA in the On and Off State. To use this feature with relays or switches, connect a “shunt resistor” (~ 50K) across the contacts.

0 = Disable,

1 = Enable

Default = 0 – Disable

Chapter Summary

In this chapter, you learned how to configure your module’s features and enter your data.

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Chapter

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

What This Chapter

Contains

About DeviceNetManager

Software

In this chapter, we tell you about:

For information on See page

About DeviceNetManager Software. . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Polled I/O Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Adapter Input Status Word. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

System Throughput. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Mapping Data into the Image Table . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Frequency Input Module (1794-IJ2) Image Table Mapping. . . . . . . . . 5-3

Block Transfer Read Word Assignments . . . . . . . . . . . . . . . . . . 5-4

Word/Bit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

DeviceNetManager software is a tool used to configure your FLEX I/O

DeviceNet adapter and its related modules. This software tool can be connected to the adapter via the DeviceNet network.

You must understand how DeviceNetManager software works in order to add a device to the network. Refer to the DeviceNetManager Software

User Manual, publication 1787-6.5.3.

Polled I/O Structure

Output data is received by the adapter in the order of the installed I/O modules. The Output data for Slot 0 is received first, followed by the

Output data for Slot 1, and so on up to slot 7.

The first word of input data sent by the adapter is the Adapter Status

Word. This is followed by the input data from each slot, in the order of the installed I/O modules. The Input data from Slot 0 is first after the status word, followed by Input data from Slot 2, and so on up to slot 7.

DeviceNet Adapter

Read Data

Adapter Status

Slot 0 Input Data

Slot 1 Input Data

Network READ

Slot 7 Input Data

Write Data

Slot 0 Output Data

Slot 1 Output Data

Read

Write

I/O Module

Slot 0

I/O Module

...

Slot 1

I/O Module

Slot 7

Network WRITE

Slot 7 Output Data

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5-2 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Adapter Input Status Word

The input status word consists of:

• I/O module fault bits – 1 status bit for each slot

• node address changed – 1 bit

• I/O status – 1 bit

Bit: 15 10 through 15 9 8 7 6

I/O Module Fault Bits

5 4 3 2 1 0

Not Used

I/O State Bit

Node Address Changed Bit

The adapter input status word bit descriptions are shown in the following table.

Bit Description

I/O Module Fault

Node Address Changed

I/O State

Bit Explanation

This bit is set (1) when an error is detected in slot position 0.

This bit is set (1) when an error is detected in slot position 1.

This bit is set (1) when an error is detected in slot position 2.

This bit is set (1) when an error is detected in slot position 3.

This bit is set (1) when an error is detected in slot position 4.

This bit is set (1) when an error is detected in slot position 5.

This bit is set (1) when an error is detected in slot position 6.

This bit is set (1) when an error is detected in slot position 7.

This bit is set (1) when the node address switch setting has been changed since power up.

9 Bit = 0 – idle

Bit = 1 – run

10 thru 15 Not used – sent as zeroes.

Possible causes for an I/O Module Fault are:

• transmission errors on the Flex I/O backplane

• a failed module

• a module removed from its terminal base

• incorrect module inserted in a slot position

• the slot is empty

The node address changed bit is set when the node address switch setting has been changed since power up. The new node address does not take affect until the adapter has been powered down and then powered back up.

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System Throughout

Mapping Data into the

Image Table

I/O Image

Input Size

1 to 7 Words

Output Size

0 to 8 Words

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5 -3

System throughput, from frequency input to backplane, is a function of:

• the configured minimum frequency sample time

• the number of channels actually configured for connection to a specific sensor (0 or 1)

You can set the minimum frequency time during module configuration.

The selection influences the sample data rate, thus affecting system throughput.

The number of channels included in each input scan also affects system throughput.

FLEX I/O frequency input module data table mapping is shown below.

Frequency Input Analog Module (1794-IJ2) Image Table

Mapping

DIR

Module Image

Frequency Channel 0

% Full Scale or Acceleration Channel 0

Frequency Channel 1

% Full Scale or Acceleration Channel 1

F/A

Reserved

MPA

R R

DIR

F/A

Diagnostics

MPA

Reserved

CF SSM

NOPTS

MPM

R LF

NOPTS

Minimum Freq or Absolute Value of Acceleration Channel 0

MPM

Frequency Scaling Divisor Channel 0 Frequency Scaling Multiplier Channel 0

WOFG

WOFF

IGI

IFI

MFST

UP0

ACT 0

F/A

AS0

Minimum Freq or Absolute Value of Acceleration Channel 1

MPDM

WOFM

WOFG

Frequency Scaling Divisor Channel 1

WOFF

IGI

IFI

MFST

UP1

Reserved

Frequency Scaling Multiplier Channel 1

ACT 1

F/A

AS1

MPDM

WOFM

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Block Transfer Read Word Assignments for the Frequency Input

Module (1794-IJ2)

(Octal Bit) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Decimal Bit 15

Where:

GS = Gate state

F/A = Frequency/Accel alarm

WO = Wire-off alarm

MPA = Missing pulse alarm

R = Reserved

12 11 10 09 08 07 06 05 04 03 02 01 00

Frequency 0 – 32,767 or 0.0 – 3,276.7 Channel 0

% Full Scale 0.0% to 3,276.7% Channel 0 or Acceleration –32,768 to +32,767 Channel 0

Frequency 0 – 32,767 or 0.0 – 3,276.7 Channel 1

% Full Scale 0.0% to 3,276.7% Channel 1 or Acceleration –32,768 to +32,767 Channel 1

Direction

Ch 0

GS Ch

F/A Ch

Ch 0

Reserved

MPA

Ch 0

R R

Direction

Ch 1

GS Ch

F/A Ch

WO Ch

Diagnostic Status

MPA

Ch 1

Reserved

Block Transfer Write Word Assignments for the Frequency

Input Module

(Octal Bit) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Dec. Bit

Where:

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

CF SSM

Ch 0

Number Of Pulses To

Terminate Sampling

Ch 0

MPM

Ch 0

R LF

Ch 1

Number Of Pulses To

Terminate Sampling

Ch 1

Maximum Frequency 0 – 32,767 – or – 0.0 – 3,276.7 – or – Absolute Value of Acceleration 0 to 32,767 – Channel 0

Frequency Scaling Divisor 0 – 255 Ch 0 Frequency Scaling Multiplier 0 – 255 Ch 0

MPM

Ch 1

WOFG

Ch 0

WOFF

Ch 0

IGI Ch

IFI

Ch 0

Minimum Frequency Sample

Time

Ch 0

Init St

Ch 0

ACT Ch 0

F/A AS

Ch 0

MPDM

Ch 0

WOFM

Ch 0

Maximum Frequency 0 – 32,767 – or – 0.0 – 3,276.7 – or – Absolute Value of Acceleration 0 to 32,767 – Channel 1

Frequency Scaling Multiplier 0 – 255 Ch 1

WOFG

Ch 1

WOFF

Ch 1

Frequency Scaling Divisor 0 – 255 Ch 1

IGI

Ch 1

IFI

Ch 1

Minimum Frequency Sample

Time

Ch 1

Init St

Ch 1

Reserved

ACT Ch 1

F/A AS

Ch 1

MPDM

Ch 1

WOFM

Ch 1

CF = Communication fault

SSM = Safe state mode

FR = Frequency Range

MPM = Missing Pulse Multiplier

LF = Local fault mode

F/AAS = Frequency/Accel alarm select

WOFF = Wire-off fault frequency

WOFG = Wire-off fault gate

WOFM = Wire-off fault mode

IGI = Invert gate input

IFI = Invert frequency input

ACT = Acceleration Calculation Time

MPDM = Missing pulse delay multiplier

R = Reserved

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5 -5

Bit/Word Descriptions

for the Frequency Input Module (1794-IJ2)

Word

Read

Word 1

Word 2

Word 3

Word 4

Word 5

Bit Definition

Bit 00-15

(00-17)

Bit 00-15

(00-17)

Bit 00-15

(00-17)

Bit 00-15

(00-17)

Bits 00

Bit 01

Bit 02

Calculated value of Frequency (channel 0) – Frequency can be reported down to 1 or 1.0 Hz, depending on the Frequency

Range bit setting; below a 1 Hz value, 0 is reported; below a 1.0 Hz value, 0.0 is reported. Calculated frequency depends on

Minimum Sampling Time and Missing Pulse Multiplier.

% of Full Scale or Acceleration (channel 0) – Value of the calculated Frequency scaled by the Maximum Frequency, or

Calculated Value of Acceleration in Hz / second, depending on the state of the Freq or Accel Alarm Select bit. Note: % Full scale will be calculated accurately up to a maximum of 3,276.7%. Beyond this maximum, the value of 3,276.7% will be returned, and a “Calculation Failure” (9) will be set in the Diagnostic Status byte.

Calculated value of Frequency (channel 1) – Frequency can be reported down to 1 or 1.0 Hz, depending on the Frequency

Range bit setting; below a 1 Hz value, 0 is reported; below a 1.0 Hz value, 0.0 is reported. Calculated frequency depends on

Minimum Sampling Time and Missing Pulse Multiplier.

% of Full Scale or Acceleration (channel 1) – Value of the calculated Frequency scaled by the Maximum Frequency, or

Missing Pulse Alarm (channel 1) – Indicates when no Frequency input pulse has occurred within the period determined by the

Minimum Frequency Sampling Time and the Missing Pulse Multiplier. Primary control is given to the Missing Pulse Multiplier to determine when this bit is set. However, if the Missing Pulse Multiplier is set to 0, then the Minimum Frequency Sampling

Time characteristics will determine when this bit is set.

Wire Off Fault Alarm (channel 1) – when set, indicates when 24 Vdc Input (IEC 1+ or Switch Contact with shunt) Wire Off

Detection has gone true for any of the Frequency or Gate inputs on a channel that has the Wire Off Fault

Select = 1.

The Frequency Alarm turns off when the Frequency drops below 95% of the Alarm Value.

The Acceleration Alarm turns off when the Acceleration drops below 90% of the Alarm Value.

Bit 03

Bits 04-05

Gate Input State (channel 1) – Indicates if there is a valid signal on the gate input. This parameter is only determined once every 0.5 – 2s.

Direction (channel 1) – Indicates the current Direction of Rotation, using both the Frequency and Gate inputs. (Frequency leads Gate = Clockwise, Gate leads Frequency = CounterClockwise). Used for slow speed detection from 1 – 1,500Hz. “No” or “Stopped” rotation can be determined by the state of the Missing Pulse Alarm, when it is switched on. A missing

Frequency Input will generate a Missing Pulse Alarm, a missing Gate Input will only generate a “No Sensor Present /

Detected” status (3).

Bits 06-07 Not used

Bits 08 (10)

Missing Pulse Alarm (channel 0) – Indicates when no Frequency input pulse has occurred within the period determined by the

Time characteristics will determine when this bit is set.

Bit 09 (11)

Bit 10 (12)

Wire Off Fault Alarm (channel 0) – When set, indicates when 24 Vdc Input (IEC 1+ or Switch Contact with shunt) Wire Off

Detection has gone true for any of the Frequency or Gate inputs on a channel that has the Wire Off Fault

Select = 1.

The Frequency Alarm turns off when the Frequency drops below 95% of the Alarm Value.

The Acceleration Alarm turns off when the Acceleration drops below 90% of the Alarm Value.

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Word

Word 5 cont.

Word 6

Word 7

Bit Definition

Bit 11 (13)

Bits 12-13

(14-15)

Gate Input State (channel 0) – Indicates if there is a valid signal on the gate input. This parameter is only determined once every 0.5 – 2s.

Direction (channel 0) – Indicates the current Direction of Rotation, using both the Frequency and Gate inputs. (Frequency leads Gate = Clockwise, Gate leads Frequency = CounterClockwise). Used for slow speed detection from 1 – 1,500Hz. “No” or “Stopped” rotation can be determined by the state of the Missing Pulse Alarm, when it is switched on. A missing

Frequency Input will generate a Missing Pulse Alarm, a missing Gate Input will only generate a “No Sensor Present /

Detected” status (3).

Bits 14-15

(16-17)

Not used

Diagnostic Status – indicate the response from the module; a normal or non-normal operating condition.

Bit 03 02 01 00

0 0 0 0 0 = Normal Operation (No Failure)

0 0 0

0 0 1

1 1 = Calibration Failure

2 = Configuration Failure

A Minimum Frequency Sample Time value other than 0-9 was selected.

Bits 00-03

1 3 = Message Failure

0 4 = Lead Break Detection Hardware Failure

1 5 = Major Hardware Failure

0 6 = EEPROM Failure

1 7 = RAM Failure

0 8 = ROM Failure

9 = Calculation Failure

The actual Frequency is greater than 32,767 Hz. or 3,276.7 Hz. (overange).

The scaled Frequency is greater than 32,767 Hz. or 3,276.7 Hz. (overange).

The % Full Scale calculation (based on Maximum Frequency) is > 3,276.7%.

10 – 15 = Not Used 1010-1111

Bits 04-15

(04-17)

Bits 00-15

(00-17

Reserved

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5 -7

Word

Write

Word 1

Bit Definition

Bits 00-01

Bits 02-04

Default = no multiplier; alarm generated immediately

Bit 01 00 Missing Pulse Multiplier

No Multiplier, alarm generated immediately (normal mode with 2s delay)

X32

Time to expire.

Default = minimum frequency sampling time.

Bit 04 03 02 Number of pulses to terminate sampling

Use minimum frequency sampling time

128

Bits 05

Bit 06

Bit 07

Bits 08-09

(10-11)

Frequency range bits (channel 1) – Specifies the Frequency Range of the Frequency input.

0 = 1-32767 (below 1Hz reports 0);

1 = 1.0-3276.7 (below 1.0Hz reports 0.0).

Default = 0

0 = safe states activated by bus communication only;

1 = safe states activated by any failure (bus communication, internal module faults, etc.)

Default = 0, safe states activated by bus communication only

Not used

Default = no multiplier; alarm generated immediately

Bit

(11)

(10)

Minimum frequency sampling time

0 No Multiplier, alarm generated immediately (normal mode with 2s delay)

1 X2

0 X8

1 X32

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Word

Write word 1 cont.

Word 2

Word 3

Bit Definition

Bits 10-12

(12-14)

Time to expire.

Defaul t = minimum frequency sampling time.

Bit

(14)

(13)

(12)

Number of pulses to terminate sampling

Use minimum frequency sampling time

0 16

1 32

0 64

1 128

Bit 13 (15)

Bit 14 (16)

Bit 15 (17)

Bits 00-15

(00-17)

Frequency range bits (channel 0) – Specifies the Frequency Range of the Frequency input.

0 = 1-32767 (below 1Hz reports 0);

1 = 1.0-3276.7 (below 1.0Hz reports 0.0).

Default = 0

Safe state mode bit – selection determines how module alarm outputs react to bus communication and internal module faults

(local fault = Wire Off Fault or Missing Pulse Alarm).

0 = Reset outputs

1 = Hold last state

Default = 0 (reset outputs).

Communication fault – Signals the module that communications has been interrupted on the network. The adapter signals that the module should execute its fault routine or go to the Safe State and control any Alarm Outputs accordingly. During normal startup, this bit must be set (1) by the user program to begin normal module operation of Alarm Outputs (in effect, an output enable). When the adapter communication link is broken, the adapter will reset this bit (0). – (Adapter dependent.)

Default = 0.

Maximum frequency or absolute value acceleration/deceleration (channel 0) – Specifies the highest Frequency or absolute

Acceleration/Deceleration value allowed on the Frequency input. 0-32,767, 0.0-3,276.7Hz. –OR– 0-32,767Hz/s depending on the Frequency Range and Frequency/Acceleration Alarm Select bits.

Bits 00-07

Bits 08-15

(10-17)

Frequency scaling multiplier (channel 0) – Specifies a multiplier to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling multiplication performed (x1)

Frequency scaling divisor (channel 0) – Specifies divisor to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling division performed (divided by 1)

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5 -9

Word

Word 4

Bit

Bits 00-01

Bits 02-03

Bit 04

Bits 05-06

Bit 07

Definition

Wire-Off/Missing Pulse fault select mode (channel 0) – Sets the mode for 24 Vdc IEC 1+ Wire Off Input Detection and Missing

(in mode 1, 2, & 3) is 2 seconds maximum.

Bit 01 00 Channel wire-off/missing pulse fault mode

Disabled

Alarm only (frequency unchanged)

Alarm and force frequency to maximum frequency value (32767 or 3276.7 or maximum frequency value, 0).

1 Alarm and force frequency to minimum frequency value (0 or 0.0).

Missing pulse delay multiplier bits (channel 0)– Specifies the number of Missing Pulse Alarms periods (Minimum Frequency

Sampling Times) which will be tolerated before the alarm is actually generated, if enabled. (Used to defeat the Missing Pulse

Alarm during a system startup.)

Default = 0 – No multiplier; alarm generated immediately (normal mode with 2s extension delay)

Bit 03 02 Alarm periods before alarm generated

No multiplier; alarm generated immediately (normal mode with 2s extension delay)

2 sample periods + 2s delay before alarm

8 sample periods + 2s delay before alarm

32 sample periods + 2s delay before alarm

0 = frequency alarm

1 = acceleration alarm

Default = 0 – frequency alarm

Acceleration Calculation Time (channel 0) – Specifies the number of Frequency Sample Times over which the module calculates acceleration.

Default = 0 – Rolling Average (previous 4 samples)

Bit 06 05 Acceleration Calculation Time in Frequency Sample Times

0 0 Rolling Average (previous 4 samples)

1 1 32

Initiate Startup Select (channel 0) – Alerts a channel that if process start up is in progress to defeat the missing pulse alarm for a time determined by the missing pulse delay multiplier.

0 = Normal Run Mode;

1 = Startup Mode – defeat/delay Missing Pulse Alarm

Default = 0 – Normal Run Mode

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5-10 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Word

Word 4 cont.

Word 5

Words 6

Bit Definition

Bits 08-11

(10-13)

Minimum Frequency Sampling Time (channel 0) – Specifies the minimum time (in ms) the module will spend collecting pulses to determine the Frequency.

Bit

(13)

(12)

(11)

(10)

Minimum Frequency Sampling Time – in ms

Bit 12 (14)

0 20

1 50

0 100

1 200

0 500

1 1000

1010 to 1111 not used – 2ms default sample time used

Invert Select – Frequency Input (channel 0) – Selects whether to invert the Frequency input signal, if not using an Active High

(24V = On) 24 Vdc IEC 1+ sensor or “Normally Open” relay or switch contact on the 24 Vdc Frequency Input terminal. Allows compatibility with an Active Low (0V = On) 24 Vdc IEC 1+ sensor or “Normally Closed” relay contact on the 24 Vdc Frequency

Input terminal.

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On).

Default = 0 – Normal (Active High, 24V = On)

Bit 13 (15)

Bit 14 (16)

Bit 15 (17)

Bits 00-15

(00-17)

Invert Select – Gate Input (channel 0) – Selects whether to invert the Gate input signal, if not using an Active High (24V = On)

24 Vdc IEC 1+ sensor or “Normally Open” relay or switch contact on the 24 Vdc Gate Input terminal. Allows compatibility with an Active Low (0V = On) 24 Vdc IEC 1+ sensor or “Normally Closed” relay contact on the 24 Vdc Gate Input terminal.

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On)

Default = 0 – Normal (Active High, 24V = On)

To use this feature with relays or switches, connect a “shunt resistor” (~ 50K) across the contacts.

0 = Disable,

1 = Enable

Default : = 0 – Disable

Wire Off Fault Select – Gate Input (channel 0) – Selects whether to turn On or Off the 24 Vdc Gate input IEC 1+ hardware Wire

Off (Lead Breakage) detection. NOTE: Customer devices must draw more than .4 mA in the On and Off State. To use this feature with relays or switches, connect a “shunt resistor” (~ 50K) across the contacts.

0 = Disable,

1 = Enable

Default = 0 – Disable

Maximum frequency or absolute value acceleration/deceleration (channel 1) – Specifies the highest Frequency or absolute

Acceleration/Deceleration value allowed on the Frequency input. 0-32,767, 0.0-3,276.7Hz. –OR– 0-32,767Hz/s depending on the Frequency Range and Frequency/Acceleration Alarm Select bits.

Bits 00-07

Bits 08-15

(10-17)

Frequency scaling multiplier (channel 1) – Specifies a multiplier to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling multiplication performed (x1)

Frequency scaling divisor (channel 1) – Specifies divisor to scale the incoming Frequency value. 0-255.

Default = 0 – no scaling division performed (divided by 1)

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5 -11

Word

Word 7

Bit

Bits 00-01

Bits 02-03

Bit 04

Bits 05-06

Bit 07

Definition

Wire-Off/Missing Pulse fault select mode (channel 1) – Sets the mode for 24 Vdc IEC 1+ Wire Off Input Detection and Missing

(in mode 1, 2, & 3) is 2 seconds maximum.

Bit 01 00 Channel wire-off/missing pulse fault mode

Disabled

Alarm only (frequency unchanged)

Alarm and force frequency to maximum frequency value (32767 or 3276.7 or maximum frequency value

≠

0).

1 Alarm and force frequency to minimum frequency value (0 or 0.0).

Missing pulse delay multiplier bits (channel 1)– Specifies the number of Missing Pulse Alarms periods (Minimum Frequency

Sampling Times) which will be tolerated before the alarm is actually generated, if enabled. (Used to defeat the Missing Pulse

Alarm during a system startup.)

Default = 0 – No multiplier; alarm generated immediately (normal mode with 2s extension delay)

Bit 03 02 Alarm periods before alarm generated

No multiplier; alarm generated immediately (normal mode with 2s extension delay)

2 sample periods + 2s delay before alarm

8 sample periods + 2s delay before alarm

32 sample periods + 2s delay before alarm

0 = frequency alarm

1 = acceleration alarm

Default = 0 – frequency alarm

Acceleration Calculation Time (channel 1) – Specifies the number of Frequency Sample Times over which the module calculates acceleration.

Default = 0 – Rolling Average (previous 4 samples)

Bit 06 05 Acceleration Calculation Time in Frequency Sample Times

0 0 Rolling Average (previous 4 samples)

1 1 32

Initiate Startup Select (channel 1) – Alerts a channel that if process start up is in progress to defeat the missing pulse alarm for a time determined by the missing pulse delay multiplier.

0 = Normal Run Mode;

1 = Startup Mode – defeat/delay Missing Pulse Alarm

Default = 0 – Normal Run Mode

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Word

Word 7 cont.

Word 8

Bit Definition

Bits 08-11

(10-13)

Minimum Frequency Sampling Time (channel 1) – Specifies the minimum time (in ms) the module will spend collecting pulses to determine the Frequency.

Bit

(13)

(12)

(11)

(10)

Minimum Frequency Sampling Time – in ms

Bit 12 (14)

0 20

1 50

0 100

1 200

0 500

1 1000

1010 to 1111 not used – 2ms default sample time used

Invert Select – Frequency Input (channel 1) – Selects whether to invert the Frequency input signal, if not using an Active High

Input terminal.

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On).

Default = 0 – Normal (Active High, 24V = On)

Bit 13 (15)

Bit 14 (16)

Invert Select – Gate Input (channel 1) – Selects whether to invert the Gate input signal, if not using an Active High (24V = On)

0 = Normal (Active High, 24V = On),

1 = Invert input (Active Low, 0V = On)

Default = 0 – Normal (Active High, 24V = On)

To use this feature with relays or switches, connect a “shunt resistor” (~ 50K) across the contacts.

0 = Disable,

1 = Enable

Default : = 0 – Disable

Bit 15 (17)

Wire Off Fault Select – Gate Input (channel 1) – Selects whether to turn On or Off the 24 Vdc Gate input IEC 1+ hardware Wire

Off (Lead Breakage) detection. NOTE: Customer devices must draw more than.4 mA in the On and Off State. To use this feature with relays or switches, connect a “shunt resistor” (~ 50K) across the contacts.

0 = Disable,

1 = Enable

Default = 0 – Disable

Bits 00-15

(00-17)

Reserved

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Defaults

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5 -13

Each I/O module has default values associated with it. At default, each module will generate inputs/status and expect outputs/configuration.

Catalog

Number

1794-IJ2

Module Defaults for:

Description

2 Frequency Input Module

Factory Defaults Real Time Size

Input

Default

Output

Default

Input

Default

Output

Default

Factory defaults are the values assigned by the adapter when you:

• first power up the system, and

• no previous stored settings have been applied.

For frequency input modules, the defaults reflect the actual number of input words/output words. For example, for the frequency input module, you have 7 input words, and 8 output words.

You can change the I/O data size for a module by reducing the number of words mapped into the adapter module, as shown in “real time sizes.”

Real time sizes are the settings that provide optimal real time data to the adapter module.

Frequency input modules have 15 words assigned to them. This is divided into input words/output words. You can reduce the I/O data size to fewer words to increase data transfer over the backplane.

For information on using DeviceNetManager software to configure your adapter, refer to the DeviceNetManager Software User Manual, publication 1787-6.5.3.

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What This Chapter

Contains

Status Indicators

Chapter

Troubleshoot the Frequency

Input Module

Use this chapter to troubleshoot the frequency input module by interpreting the:

For information on See page

Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

The module contains indicators for each of the following:

• Frequency and Gate Inputs

• Frequency and Gate Wire-Off Faults

• Alarm Outputs.

Allen-Bradley

FREQUENCY INPUT 2 CHANNEL

1794-IJ2

FREQ

GATE

F 1

FREQ

B C

GATE

OUT

A = Input indicator.

B = Insertable label for writing individual I/O assignments.

C = Wire-Off Fault indicator.

D = Output indicator.

E = Power/status indicator - indicates power applied to module and status of module.

When an input indicator (yellow) is lighted, it indicates that a valid signal

(active high or active low) is present at one of the Input terminals.

When wire-off detection is enabled, and a wire-off fault is detected (24

Vdc IEC 1+ input terminal only), a fault indicator (red) is blinked/flashed at a rate of 1Hz to signal a fault condition. A wire-off fault signal will also be sent to the backplane. A flashing red fault indication means a valid wire-off condition for a 24 Vdc IEC 1+ Input or a 24 Vdc contact switch input with a shunt resistor.

When an output indicator is yellow, the logic is driving an output alarm

On. After detecting a fault, the internal circuitry will set the output data to the appropriate safe state, as defined by the module data table. Safe state control may be adapter dependent.

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6-2 Troubleshoot the Frequency Input Module

The input and output indicators are on the field side of the isolation path, and display the logic state of the actual microcontroller input and output.

The status indicator initially powers up as solid green, indicating the power supply is operating and internal diagnostic tests are being performed. After a successful power up test, the indicator remains green.

The indicator turns red in about 1.5s if there is an internal diagnostics error

The module is operating correctly when the green OK indicator is on.

A red OK indicator shows that the module is in a Faulted condition

(internal error).

Indicator

Input (0, 1)

(Freq, or Gate)

Fault (F)

(Freq, or Gate)

Output

(0, 1)

Status (OK)

Condition Operating Description

Off (Dark)

On (Yellow)

Input Turned Off, Input Not Used, or Wire Disconnected

Input Turned On (Active High or Active Low if Inverted)

Off (Dark) Wire Connected, Normal Operation or Detection Disabled

On (Red Flashing) Wire Disconnected, Fault Condition (Or low shunt current)

Off (Dark)

On (Yellow)

Off (Dark)

Solid Green

Solid Red

Output Alarm Turned Off

Output Alarm Turned On (Logic Drive On)

24V Power Turned Off, or 5V Logic Power Problem

Module OK, Normal Operating Mode

Module MicroController / Watchdog Fault, Outputs Disabled

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Diagnostics

What’s Next

Word 5

Troubleshoot the Frequency Input Module 6 -3

The frequency input module returns diagnostics to the PLC processor in word 5 of the BTR file. These diagnostics give you information on the status or condition of the module.

Diagnostic Bits in Word 5 of the BTR File

word 5

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

See Table for diagnostics

Bits 00-03

Diagnostic Status – indicates the response from the module; a normal or non-normal operating condition.

Bit 03 02 01 00 Decimal equivalent and condition

0 0 0 0 0 = Normal Operation (No Failure)

0 0 0

0 0 1

1 1 = Calibration Failure

2 = Configuration Failure – A Minimum Frequency Sample

Time value other than 0-9 was selected.

3 = Message Failure

4 = Lead Break Detection Hardware Failure

5 = Major Hardware Failure

6 = EEPROM Failure

1 0

1010-1111

1 7 = RAM Failure

0 8 = ROM Failure

9 = Calculation Failure

The actual Frequency is greater than 32,767 Hz. or 3,276.7

Hz. (overange).

The scaled Frequency is greater than 32,767 Hz. or 3,276.7

Hz. (overange).

The % Full Scale calculation (based on Maximum

Frequency) is

3,276.7%.

10 – 15 = Not Used

To find out more about the IJ2 module:

See appendix A or appendix B

Specifications

For specifications on the IJ2 module simplified schematics

Publication 1794-6.5.11 - November 1997

6-4 Troubleshoot the Frequency Input Module

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

What This Appendix

Contains

Appendix

Specifications

This appendix contains the frequency accuracy and general specifications of the Frequency Input module (cat. no. 1794-IJ2).

Specifications – 1794-IJ2 Frequency Input Module

Input Specifications

Number of Input Channels

Number of Inputs per Channel

Input Frequency (maximum)

2 – Frequency and Gate (gate used to establish direction)

1-32KHz w/Sine Wave; 1-32KHz w/Square Wave Input

Frequency Value (maximum)

Input Pulse Width (minimum)

32,767 or 3,276.7 (dependent on range)

20µs

Resolution/Accuracy

Refer to Resolution/Accuracy table on page 4

On-State Voltage (Minimum) 10V (24V IEC

1 proximity, encoder input or switch inputs)

On-State Voltage (Nominal)

(selected by terminal base connections)

50mV ac, 28V ac peak – Extended Magnetic Pickup

500mV ac, 28V ac peak – Magnetic Pickup

≤

3V – Vortex Flowmeter low range

≥

6V – Vortex Flowmeter high range

24V dc IEC1+ Proximity or Encoder input

24V dc Contact Switch input

On-State Voltage (Maximum) Limited to isolated 24V dc power supply maximum

On-State Current Minimum

Nominal

Maximum

Off-State Current Minimum

2.0mA

9.0mA

10.0mA

1.5mA into 24V dc IEC1+ Terminal

Off-State Voltage Maximum 5.0V dc on 24V dc IEC1+ Terminal

Wire-Off Detection 0.4mA for proximity, encoder, or contact switch with 50k

Ω shunt resistor

Frequency Input Impedance

Gate Input Impedance

Ω

for 50mV extended magnetic pickup

Ω

for 500mV magnetic pickup

10K

Ω

for 3V vortex flowmeter

10K

Ω

for 6V vortex flowmeter

2.5K

Ω

for 24V dc IEC1+ proximity or encoder input

2.5K

Ω for 24V dc contact switch input

Ω

for 50mV extended magnetic pickup

Ω

for 500mV magnetic pickup

2.5K

Ω

for 24V dc IEC1+ proximity or encoder input

2.5K

Ω

for 24V dc contact switch input

Output Specifications (meets IEC 1A 24V dc output specification)

Number of Outputs 2 isolated

Output Voltage Source

Output Voltage Minimum

Nominal

Maximum

Customer supplied

10V dc

24V dc

31.2V dc

Off-State Voltage Maximum 31.2V dc

Specifications continued on next page.

Publication 1794-6.5.11 - November 1997

A-2 Specifications

Specifications – 1794-IJ2 Frequency Input Module

On-State Current Minimum

Maximum

1.0mA per output minimum

1.0A per channel sourced out of module.

Current Limited: All outputs can be on simultaneously without derating

Surge Current 2A for 50ms, repeatable every 2s

Off-State Leakage Maximum Less than 30

A @ 31.2V dc

On-State Voltage Drop

Maximum

0.9V dc @ 1A

Output Control

Output Switching Time

Outputs individually assignable to:

Frequency, % Full Scale, or Acceleration Alarm

Triggered by frequency alarm or acceleration alarm

Turn On: Less than 0.5ms

Turn Off: Less than 1ms

General Specifications

Module Location

External dc Power

Supply Voltage

Voltage Range

Supply Current

Isolated dc Power

Supply Voltage

Voltage Range

Supply Current

Peak ac Ripple

Isolation Voltage

Cat. No. 1794-TB3G, –TB3GS Terminal Base

(Input for +5V logic and 24V dc/dc converters)

24V dc nominal

19.2 to 31.2V dc (includes 5% ac ripple)

220mA @ 19.2V dc; 180mA @ 24V dc; 140mA @ 31.2V dc

(Output to sensors and encoders)

24V dc nominal

21.6 to 26.4V dc

0-60mA maximum @ 24V dc

(4 devices @ 15mA = 60mA)

100mV maximum

1250 Vrms/V ac between user Input (F & G) and System, user

Output (0 & 1) and System, and user power and System

100% tested at 2121 Vdc for 1s.

500 Vrms/V ac between 4 user Inputs and 2 user Outputs, user

Output 0 and Output 1

100% tested at 850 Vdc for 1s

≤

4ms

30mA @ 5V dc

4.6W maximum @ 31.2V dc

Processing Time

Flexbus Current

Power Dissipation

Thermal Dissipation

Indicators (field side driven, logic side indication)

Maximum 15.6 BTU/hr @ 31.2V dc

1 green/red power/status indicator

Input:

4 yellow status indicators (0, 1) – logic side

4 red wire-off indicators (F) – logic side

Output:

2 yellow status indicators (0, 1) – logic side

Keyswitch Position 1

Specifications continued on next page.

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

Specifications

Specifications – 1794-IJ2 Frequency Input Module

Dimensions Inches

(Millimeters)

Environmental Conditions

Operational Temperature

Storage Temperature

Relative Humidity

Shock Operating

Non-operating

Vibration

Input Conductors

Wire

Resolution and Accuracy

1Hz or

0.1Hz (depending on frequency range bit setting), or

accuracy specification listed below, whichever is greater.

Resolution percent is defined as:

% resolution = countfrequencyxminimumfrequencysampletime

Accuracy percent is defined as:

% resolution = 100 1 –

+ countfrequency

100

200

500

1000

Minimum

Frequency

Sampling

Time in ms

Sampling

Accuracy

0.02%

0.01%

0.008%

0.004%

0.002%

0.0008%

0.0004%

0.0002%

0.00008%

0.00004%

0.0225%

Time Base

Accuracy

Deviation in Hz Due to Total Accuracy

0.0425%

0.0325%

0.0305%

0.0265%

0.0245%

0.0233%

0.0229%

0.0227%

0.02258%

0.02254%

Worst Case

Total Accuracy 1.0-3276.7

Frequency Range

0.1-1.4Hz

0.1-1.1Hz

0.1-1.0Hz

0.1-0.9Hz

0.1-0.8Hz

0.1-0.7Hz

1-32767

Frequency Range

1-14Hz

1-11Hz

1-10Hz

1-9Hz

1-8Hz

1-7Hz

Resolution

0.01%

0.005%

0.004%

0.002%

0.001%

0.0004%

0.0002%

0.0001%

0.00004%

0.00002%

Allen-Bradley Replacements

Publication 1794-6.5.11 - November 1997

What This Appendix

Contains

Input Circuits

Appendix

Schematics

Use this appendix to understand the internal logic of the 1794-IJ2 module.

Follow the wiring practices described in “Industrial Automation Wiring and Grounding Guidelines for Noise Immunity,” publication 1770-4.1, when wiring your I/O devices. This includes:

• routing conductors

• grounding practices

• use of shielded cables

The frequency input module input logic consists of:

• frequency input circuits

• gate input circuits

Frequency Inputs

The frequency input circuit uses a comparator to determine when the input voltage threshold is exceeded. When exceeded, it provides logic pulses internal to the IJ2 module. The circuit is designed to interface with both active or passive sensor inputs by accepting any pulse output device

(such as vortex flowmeter, magnetic pickup or digital pickup).

Gate Inputs

Gate inputs are similar to frequency inputs and are used for determining direction. There is one gate associated with each frequency input circuit

(G0 corresponds to F0). The circuit is designed to interface with both active or passive sensor inputs by accepting any pulse output device (such as magnetic pickup or digital pickup).

Publication 1794-6.5.11 - November 1997

B-2 Schematics

Isolated 24V Power (F and G,

15mA each)

24V

IEC 1+ or

24V dc

Switch Input

50/500mV

Input

2.5K

5.11K

2.15K

6V Vortex

Input

Frequency only, not on gate

8.25K

W 100K W

100pF

3V Vortex

Input

8.25K

W 46.4K

100pF

2.15K

100pF

215 W

Lead Breakage

Reference Voltage

47pF

10K W

100pF

Frequency Lead Break

(Gate Lead Break)

Nor

10K W

100pF

Frequency Input

(Gate Input)

Internal 500mV

Ref. Voltage

50mV Select

Jumper

Output Circuits

825 W

Invert Frequency

(Gate) Input

Return

The 1794-IJ2 module output logic consists of digital outputs.

Digital Outputs

The module’s output is comprised of an isolated power MOSFET. This device operates in current sourcing mode, and is capable of delivering up to 1A (@ 10-31.2V dc).

Output Channel

Supply

3.83K

10K W

3.83K

6.8V

Q1 s

Output

TEMPFET

Output 0

RT1

Alarm

10-31.2V

R load

1A max

Customer supplied power, ranging from +10V to +31.2V dc, is connected internally to the power output transistor. When an output is turned on, current flows into the source, out of the drain, through the load connected to the ground of the customer supply

(customer return). Diode D6 protects the power output transistors from damage due to inductive loads.

Output Q1 is a thermally protected FET and will turn off @ 3A (approximately). After an output goes into thermal shutdown, you must fix the cause of the shutdown and toggle the outputs ON and OFF to reenergize the output.

RT1 protects D6 and Q1 if power supply polarity is reversed.

Supply Return

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Publication 1794-6.5.11 - November 1997

24V dc from terminal base

Schematics

DC to DC Converters (24V dc power supplies)

The module provides two 24V (

10%) power sources rated at 15mA each. Each power source can power one Bently Nevada 3300 (5mm or

8mm) Proximity Transducer.

B -3

Channel 0 current limit

Frequency 0 15mA

30mA maximum

Gate 0 15mA dc/dc converter

To customer devices

Channel 1 current limit

Frequency 1 15mA

30mA maximum

Gate 1 15mA

The frequency input module isolated power supply consists of 1 isolated

24V dc power supply that provides 2 current limited outputs of 30mA maximum

(1 for each channel).

Publication 1794-6.5.11 - November 1997

Index

Numerics

1794IJ2, 6-1

1794IJ2 module, B-1

acceleration alarm, 1-5

adapter input status word, 5-1

applications

features, 1-5

modes of operation, 1-4

B bit/word definitions

block transfer write, 4-6

bit/word description, 5-5

bit/Word descriptions, 4-6

bit/word descriptions

block transfer read, 4-3

block transfer

read, 1-2 write, 1-2

block transfer programming

PLC2 family processor, 3-2

PLC3 family processor, 3-2

PLC5 family processor, 3-3

PLC5/250 processor, 3-4

block transfer read, 3-1, 4-2

word assignments, 4-3, 5-4

block transfer write, 3-1

bit/word assignments, 4-6

word assignments, 4-5, 5-4

BTR

diagnostics, 6-3

C communication

block transfers, 3-1

compatible terminal bases, 2-9

configurable features, 4-1

connecting wiring, 2-9

considerations

pre-installation, 2-1

curent draw

through base units, 2-2

current requirements

frequency input module, 2-2

daisy-chaining wiring, 2-3

dc to dc converters

DeviceNetManager

diagnostics

digital outputs

DIN rail mounting, 2-4

direction sensor mode, 1-4

European Union Directive compliance,

2-1

example

TC/RTD/mV 1794TB3, 2-12

frequency alarm, 1-5

frequency input

circuit diagram, B-1

G gate input

circuit diagram, B-1

I/O module fault, 5-2

indicators

states, 2-13 status, 2-13

troubleshooting, 6-1

input

magnetic pickup, 1-4 modes of operation, 1-4 proximity probes, 1-4 input capabilities, 1-4

input mapping, 4-2

input status word, 5-2

installation

module, 2-7

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Publication 1794-6.5.12 - November1997

I–2 Index

keyswitch positions, 2-7

magnetic pickup, 1-4

mapping

1794IJ2, 4-2, 5-3

modes of operation, 1-4

module fault, 5-2

module installation, 2-7

mounting

on terminal base, 2-7

mounting kit

cat. no. 1794NM1, 2-6

optimal defaults, 5-13

panel/wall mounting, 2-6

PLC2 family processor, 3-2

PLC3 family processor, 3-2

PLC5 family processor, 3-3

PLC5/250 processor, 3-4

power defaults, 5-13

proximity probes, 1-4

R removing and replacing

under power (RIUP), 2-8

S sample program

PLC3, 3-2

PLC5, 3-3

PLC5/250, 3-4

software

DeviceNetManager, 5-1

status indicators, 2-13

system throughput, 5-3

TC/RTD/mV 1794TB3 example, 2-12

TC/RTD/mV input mapping

1794IJ2, 5-3

terminal bases

compatible, 2-9

troubleshooting, 6-1

wall/panel mounting, 2-6

wiring

methods of, 2-3

wiring connections, 2-9

1794IJ2, 2-11

word assignments

block transfer read, 4-3, 5-4

block transfer write, 4-5, 5-4

Publication 1794-6.5.12 - November1997

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Publication Problem Report

If you find a problem with our documentation, please complete and return this form.

Pub. Name Frequency Input Module User Manual

Cat. No.

1794-IJ2 Pub. No.

1794-6.5.11

Pub. Date November 1997 Part No.

955128-50

Check Problem(s) Type:

Technical Accuracy

Describe Problem(s): text illustration

Internal Use Only

Completeness

What information is missing?

procedure/step example explanation illustration guideline other definition feature info in manual

(accessibility) info not in manual

Clarity

What is unclear?

Sequence

What is not in the right order?

Other Comments

Use back for more comments.

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

Key features

2 Frequency Inputs
2 Gate Inputs
2 Outputs
Frequency up to 32,767 Hz
Magnetic pickup, proximity probe, vortex flowmeter inputs
User-configurable sampling time
Direction detection (CW/CCW)
Missing pulse alarm
Isolated outputs (1A each)
Block transfer communication

Frequently asked questions

The module can measure frequencies up to 32,767 Hz.

The module accepts magnetic pickup, proximity probe, and vortex flowmeter input signals.

The module calculates frequency over a user-specified time interval, with the option to terminate the sampling when a user-defined number of pulses is reached.

The module has two isolated outputs, each capable of sourcing up to 1A of current at 10-31.2V dc.

Yes, the module can detect direction using the frequency and gate inputs and two sensors. The direction is determined based on the order of Low to High transitions on the inputs.

Allen-Bradley

FLEX I/O

Frequency

Input Module

User

Manual

Important User Information

Preface

Using This Manual

Purpose of this Manual

Audience

Vocabulary

Manual Organization

Conventions

For Additional Information

Summary

Chapter 2

Writing Configuration to and

Reading Status from Your

Module with a Remote I/O

Adapter

Chapter 3

Chapter 5

Chapter 6

Appendix A

Appendix B

What This Chapter

Contains

How You Use the

Frequency Input Module

Overview of the Frequency

Input Module

Gate Input Frequency Input

Counter

What the Frequency Input

Module Does

Typical Applications

Input Capabilities

Selecting the Mode(s) of Operation

Output Capabilities

Implementing Application Features

How Frequency is

Calculated

Frequency Calculation

Termination on Number of Pulses

Missing Pulse Multiplier

Direction Detection

Chapter Summary

What This Chapter

Contains

Before You Install Your

Input Module

European Union Directive

Compliance

How to Install Your Frequency

Input Module

EMC Directive

Power Requirements

Low Voltage Directive

Wiring the Terminal Base Units (1794-TB3G shown)

Installing the Module

Mounting the Terminal Base Unit on a DIN Rail

Panel/Wall Mounting

Mounting the Frequency Input Module on the Terminal Base

Unit

Connecting Wiring for Your

Frequency Input Module

Connecting Wiring using a 1794-TB3G and –TB3GS Terminal

Base Units

Wiring connections for the 1794-IJ2 Frequency Input Module

Examples of Wiring to a 1794-TB3G Terminal Base Unit

Module Indicators

Chapter Summary

What This Chapter

Contains

Enter Block Transfer

Instructions

Programming Your Frequency

Input Module

PLC-2 Family Processor