Allen-Bradley 1771-ASB, D Series User Manual
Allen-Bradley D Series Remote I/O Adapter Module is an advanced device that provides reliable and efficient remote I/O connectivity in industrial automation systems. It enables seamless communication between programmable logic controllers (PLCs) and remote I/O devices, facilitating data acquisition, control, and monitoring in distributed applications.
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Remote I/O Adapter Module
Cat. No. 1771ASB Series D
User Manual
Allen-Bradley PLCs
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.
Summary of Changes
Summary of Changes
Summary of Changes
This release of the publication covers the series D Remote I/O Adapter module (cat. no. 1771-ASB). The series D module has new firmware which provides faster link turnaround time.
Updated Information
This release also includes information previously included in the following release notes:
publication 1771-6.5.83–RN1 dated May 1992
publication 1771-6.5.83–RN2 dated July 1993
To help you find new and updated information in this release of the publication, we have included change bars as shown to the right of this paragraph.
Allen-Bradley PLCs
S-1
Table of Contents
Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . S1
Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What This Manual Contains
Audience
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Terminology Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . .
Product Compatibility
Related Publications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P1
P1
P1
P1
P2
P3
P4
P4
Introducing the Remote I/O Adapter Module . . . . . . . . . . .
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Description and Features . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Components
Summary
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
11
12
13
Installing Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Location and Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Module Configuration Plugs
Setting the Module Switches
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the I/O Chassis Switches . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the I/O Chassis Power Supply Configuration Plug . . . . . . .
Wiring the Field Wiring Arm
Installing the Terminator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compatibility of 1771 Remote I/O Products with
Extended Node Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
21
21
21
22
23
29
212
212
214
214
215
Addressing Modes for Your Remote I/O . . . . . . . . . . . . . . .
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Addressing
2Slot Addressing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Complementary I/O with 2Slot Addressing
1Slot Addressing
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assigning I/O Rack Numbers with 1Slot Addressing
1/2 Slot Addressing
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Complementary I/O with 1/2Slot Addressing . . . . . . . . . . . . . . . .
Mixing 1 and 2Slot Addressing in Individual Chassis . . . . . . . . . . .
31
31
31
33
39
313
317
319
322
323
ii Table of Contents
Acceptable Chassis Combinations . . . . . . . . . . . . . . . . . . . . . . . .
I/O Chassis/Adapter Module Combinations . . . . . . . . . . . . . . . . . .
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
324
325
325
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting With the Indicator Lights . . . . . . . . . . . . . . . . . . .
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
41
41
43
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
General Information
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B1
B1
Allen-Bradley PLCs
Preface
Using This Manual
Preface Objectives
Read this preface to familiarize yourself with this manual and to learn how to use it properly and efficiently.
What This Manual Contains
The contents of this manual are as follows:
Table P.A
What This Manual Contains
Chapter
1
2
3
4
Appendix
A
B
Title
Introducing the Remote I/O Adapter
Module
Installing Your Module
Configuring Your Remote I/O
Troubleshooting
Specifications
Settings for 1771-AS and -ASB/A and B
What's Covered
Describes features, capabilities, and hardware components.
Procedures and guidelines for installing the module
Hardware addressing and configuration options
Troubleshooting aids
Module specifications
Comparable switch settings and keying information for older adapters
Audience
We assume that you have previously used an Allen–Bradley programmable controller, that you are familiar with its features, and that you are familiar with the terminology we use. If not, read the user manual for your processor before reading this manual.
P-1
Preface
Using This Manual
Terminology Used in This
Manual
The following list defines common terms used in this manual.
Complementary I/O: An I/O technique that allows a PC to interface with an input and output module using the same location address in different I/O chassis.
Complementary Module: A module that performs an opposite function; an input module complements an output module and vice versa.
Standard–Density I/O Module: A module that provides up to 8 input terminals or 8 output terminals.
High–Density I/O Module: A module that provides 16 input or 16 output terminals.
Quad–Density I/O Module: A module that provides 32 input or 32 output terminals.
I/O Group: An addressing unit that can contain up to 16 input terminals and 16 output terminals.
PC: An Allen–Bradley programmable controller, such as the PLC–5.
Processor: A term used to mean an Allen–Bradley programmable controller.
Half–Slot Addressing: A method of addressing where the processor can address its I/O in 1/2–slot I/O groups.
One–Slot Addressing: A method of addressing where the processor can address its I/O in 1–slot I/O groups.
Two–Slot Addressing: An method of addressing where the processor can address its I/O in 2–slot I/O groups.
P-2
Allen-Bradley PLCs
Preface
Using This Manual
Product Compatibility
The remote I/O adapter module is one of many hardware components that make up a programmable controller system. Table P.B lists the hardware components and products with which you can use the adapter module.
Table P.B
Compatible Hardware Products
Product name
Processors
Description
PLC-2/20 Programmable Controller
PLC-2/30 Programmable Controller
PLC-3 Programmable Controller System
PLC-5 Programmable Controller Family
PLC-5/250 Programmable Controller (Pyramid Integrator)
I/O Scanners
Universal I/O
Chassis
I/O Modules
Remote I/O Scanner/Distribution Panel for PLC-2 Family Processors
I/O Scanner-Programmer Interface Module for PLC-3 Family
Processors
I/O Scanner-Message Handling Module for PLC-3 Family Processors
VMEbus I/O Scanner
IBM PC I/O Scanner
Q-bus PC I/O Scanner
Sub-I/O Scanner
Pyramid Integrator Remote I/O Scanner
4-slot
8-slot
12-slot
16-slot
Block transfer modules
8-point I/O Standard density I/O modules
16-point I/O High density I/O modules
32-point I/O Quad-Density I/O modules
Block I/O modules (cat. no. 1791)
Adapter modules Remote I/O Adapter Module (can mix 1771-ASB/B and 1771-AS in same remote system - limited to 115.2k Baud or less)
Power Supplies System power supply
Auxiliary power Supply
Auxiliary Power Supply module (120V AC input, 3A)
Auxiliary Power Supply module (120V AC input, 8A)
Redundant Power Supply module
Auxiliary Power Supply module (24V DC input, 8A)
Auxiliary Power Supply module (220/240V AC input, 8A)
Auxiliary Power Supply module (120/220V AC input, 16A)
PLC-2 Power Supply (115V AC input)
PLC-2 Power Supply (24V DC input)
Local Power Supply
PLC-3 Power Supply
Auxiliary Power Supply (24V DC input)
Catalog number
1772-LP1, -LP2
1772-LP3
1775-L3
1785-LT, -LT2, 6008-LTV
5250-LP
1772-SD, -SD2
1775-S4A, -S5
1775-S4B, -GA
6008-SV
6008-SI
6008-SQ
1771-SN
5150-RS
1771-A1, -A1B
1771-A2, -A2B
1771-A3B, A3B1
1771-A4, -A4B
All modules that use the 1771
I/O structure
1771-AS
1771-P1
1771-P2
1771-P3
1771-P4, -P4S, -P4S1
1771-P4R
1771-P5
1771-P6S, -P6S1
1771-PS7
1772-P1
1772-P4
1774-P1
1775-P1
1777-P4
P-3
Preface
Using This Manual
Related Publications
Summary
Read this manual in conjunction with the following documentation:
Publicatin Number
1770-4.1
1771-2.210
1772-6.6.2
1772-6.8.1
1772-6.8.3
1772-2.8
1772-2.18
1775-6.7.1
1775-6.3.1
1775-6.5.2
1775-6.5.3
1785-6.6.1
5000-6.4.7
6008-6.2.1
6008-6.5.2
6008-6.5.3
Title
Programmable Controller Grounding and Wiring Guidelines
Universal I/O Chassis Product Data
PLC-2/20 and 2/30 Assembly and Installation Manual
PLC-2/20 Programming and Operations Manual
PLC-2/30 Programming and Operations Manual
Remote I/O Scanner/Distribution Panel Product Data
Remote I/O Scanner/Distribution Panel Product Data
PLC-3 Controller Installation and Operations Manual
PLC-3 Controller Backup Concepts Manual
I/O Scanner-Programmer Interface Module User's Manual
I/O Scanner-Message Handling Module User's Manual
PLC-5 Family Assembly and Installation Manual
PLC-5/250 Installing and Configuring Manual
Q-bus I/O Scanner Module Installation Manual
VME I/O Scanner Module User's Manual
IBM PC I/O Scanner Module User's Manual
For a complete list of Allen–Bradley documentation, refer to Publication
SD499, PC Publication Index.
This chapter gave you information on how to use this manual efficiently.
The next chapter introduces you to the remote I/O adapter module.
P-4
Allen-Bradley PLCs
Chapter
1
Introducing the Remote I/O Adapter Module
Chapter Objectives
Module Description and
Features
This chapter describes the cat. no. 1771-ASB, series D remote I/O adapter module:
module description and features
The remote I/O adapter module serves as an interface between remote I/O modules and programmable controllers. The remote I/O adapter:
transmits data up to 10,000 cable-feet (at 57.6K baud)
provides faster backplane scanning and data transmission up 2500 cable-feet at 230.4K baud
receives/sends data from/to the I/O scanner in serial form
reads/writes data from/to the input modules in parallel form
reads/writes data from/to the output modules in parallel form
supports any mix of I/O (4, 6, 8, 16 or 32 points)
supports three methods of I/O addressing; 1/2-slot, 1-slot and 2-slot
checks I/O configuration on power-up to verify I/O module placement
scans all slots in the chassis, or all but the last four slots, allowing improved scan time and I/O image space savings. Slot power supplies can be used in the last quarter of the rack without using I/O space.
can emulate series B adapters, providing system response similar to the
1771-ASB series B. This allows use of 1771-S4A and -S4B scanners which require slower response for proper operation.
has enhanced diagnostic indicators for easier troubleshooting.
1-1
Chapter 1
Introducing the Remote I/O Adapter
Module
Hardware Components
The remote I/O adapter module consists of four major components:
module switch assemblies
field wiring arm
Diagnostic Indicators
Diagnostic indicators are located on the front panel of the adapter module
(Figure 1.1). They show both normal operation and error conditions in your remote I/O system. The indicators are:
ACTIVE (green)
ADAPTER FAULT (red)
I/O RACK FAULT (red)
A complete description of these indicators and how to use them for troubleshooting is explained in chapter 4.
Figure 1.1
Remote I/O Adapter Module
Switch S2
Switch S1
Diagnostic
Indicators
Field
Wiring
Arm
Configuration
Jumpers
1-2
Allen-Bradley PLCs
10796I
Summary
Chapter 1
Introducing the Remote I/O Adapter
Module
Module Switch Assemblies
You must set two switch assemblies to configure your adapter module.
Figure 1.2 shows the location of the switches.
Figure 1.2
Switch Locations
Switch Assembly
(S1)
Switch Assembly
(S2)
The S1 Assembly is used to select:
the first I/O group number
the I/O rack number
I/O scanner communication with or without complementary I/O
(for PLC-2 family processors)
The S2 Switch Assembly selects:
a specific baud rate based on the maximum I/O chassis distance
I/O scanner communication with or without complementary I/O
(for PLC-2 family processors)
scan - processor will scan all slots in the chassis, or all but the last four slots in the chassis
link response - establishes series B emulation response time required for compatibility with PLC-2 and PLC-3 scanners.
Field Wiring Arm
The field wiring arm (cat. no. 1771-WB) provides connection points for:
I/O communication cables
a user-supplied I/O chassis restart pushbutton
The field wiring arm (Figure 1.1) pivots on the front of the chassis to connect with the module’s printed circuit board. This feature allows you to remove the adapter module without disconnecting the system wiring.
In this chapter we discussed the functions and hardware components of the
Remote I/O Adapter Module.
1-3
Installing Your Module
Chapter
2
Chapter Objectives
This chapter describes the procedures for installing your remote I/O adapter module. These include:
module location and keying
setting configuration plugs
setting the module switches
setting the I/O chassis switches (backplane and
setting the I/O chassis power supply configuration plug
wiring the field wiring arm
installing the terminator resistor
compatibility of products
installing the module
Power Requirements
The remote I/O adapter module requires a backplane current of 1.0A at
5V dc. Remember to add this amount to other current requirements for your remote I/O chassis.
Module Location and Keying
The remote I/O adapter module must be installed in the leftmost slot of the
I/O chassis.
The I/O chassis backplane connectors are keyed to accept only one type of module. This prevents accidental insertion of other modules in the wrong module slot. Key the backplane connectors (Figure 2.1) for the adapter module as follows:
upper connector: between 54 and 56
lower connector: between 16 and 18
Figure 2.1
Keying Diagram
4 8
5 0
5 2
5 4
5 6
4 0
4 2
4 4
4 6
Upper Connector
Insert keying bands between: upper connector 54 and 56 lower connector 16 and 18
6
8
2
4
1 0
1 2
1 4
1 6
1 8
Keying Bands
Allen-Bradley PLCs
12252
2-1
Chapter 2
Installing Your Module
Setting the Module
Configuration Plugs
You need to set configuration plugs on the remote I/O adapter module to use 32-point I/O modules, . You access the plugs through the access hole on the left side of the module (Figure 2.2). Each plug is inserted on two pins of a three-pin connector. Thermocouple Input Modules (Cat. No.
1771-IX and -IY) are not compatible with 32-point I/O modules.
Figure 2.2
Setting the Module Configuration Plug
Position all 3 jumpers on the left 2 pins 10797I
Important: When you set the configuration plugs in the left position, you can use 32-point I/O modules and any addressing method, but you cannot use Cat. No. 1771-IX or 1771-IY modules. When you set these plugs in the right position, you can use 1771-IX and 1771-IY modules and any addressing method, but you cannot use 32-point I/O modules. If the plugs are set incorrectly, addressing errors will occur.
If you need to use a thermocouple module and 32-point I/O modules in the same remote chassis, use the 1771-IXE Thermocouple/Millivolt Module
(Cat. No. 1771-IXE).
2-2
Chapter 2
Installing Your Module
Setting the Module Switches
Set switch assemblies S1 and S2 (Figure 2.3) with a blunt, pointed instrument such as a ball-point pen. Do not use a pencil; the lead could break off and jam the switch.
This publication describes switches as being either on or off. The words
ON and OFF should be printed on the switch assemblies. If a switch assembly has the word OPEN printed on it, the word OPEN corresponds to OFF.
Figure 2.3
S1 and S2 Switch Assembly Locations
1 2 3 4 5 6 7 8
O
F
F
Address Switch Assembly
(S1)
Address Switch Assembly (S1)
You use this switch assembly to select:
O
N
O
F
F
1 2 3 4
Switch Assembly
(S2)
5 6
primary/complementary – I/O scanner communication with or without complementary I/O (for PLC-2 and PLC-5 family processors)
Switch Assembly (S2)
You use this switch assembly to select:
baud – a specific baud rate based on the maximum I/O chassis distance
primary/complementary – I/O scanner communication with or without complementary I/O (for PLC-2 family processors)
scan - select whether the processor will scan all slots in the chassis, or all but the last four slots in the chassis
Allen-Bradley PLCs
2-3
2-4
Chapter 2
Installing Your Module
link response - unrestricted or series B emulation.
Certain scanner modules with multiple communication ports require a delay in the link turnaround time to allow the central processing unit (CPU) in the scanner sufficient time to service all communication ports. Without this delay, some incoming information may be missed while the scanner is servicing another port. This results in multiple communication retries. To provide the necessary delay, set the link response switch (position 5, switch
S2) to the ON position.
Scanner modules which require a delay are:
Programmable Controller
PLC2
PLC3
Scanner Module
1772SD2
1775S4A
1775S4B
1775S5
1775SR5
1775SR
Refer to the Table below for Figure and page numbers of switch settings for each processor family.
S1 and S2 Switch Settings for: Refer to:
PLC2 family processor
PLC3 family processor
Figure 2.4, page 25
Figure 2.5, page 26
PLC5 family processor without complementary I/O Figure 2.6, page 27
PLC5 family processor with complementary I/O Figure 2.7, page 28
Chapter 2
Installing Your Module
Figure 2.4
Module Switch Assembly Settings for PLC2 Family Processors
Address Switch Assembly
(S1)
O
F
F
O
N
1 2 3 4 5 6 7 8
First I/O group number
(Table 2.C)
I/O rack number
(Table 2.C)
SD always ON
SD2 without complementary I/O
always ON
SD2 with complementary I/O
ON Primary chassis
OFF Complementary chassis
Always ON
Switch Position
1 2
ON OFF
OFF OFF
ON ON
OFF ON
Maximum I/O chassis distance
57.6K Baud 10,000ft
115.2K Baud 5,000ft
Not Used
Not Used
Switch Assembly
(S2)
5 6
O
N
O
F
F
1 2 3 4
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Off
Link Response ON for series B emulation
OFF for unrestricted
ATTENTION: Link response switch must be ON when using the following scanner modules:
1772SD2
Scan on for all but last 4 slots off for all slots
SD always OFF
SD2 without complementary I/O always OFF
SD2 with complementary I/O
ON Primary chassis
OFF Complementary chassis 10798I
Table 2.C
I/O Rack Number and First I/O Group Switch Selections for the Address
Switch Assembly S1 (PLC2 Family Processors)
I/O Rack
Number
3
4
5
6
1
2
7
Switch Selections
4 5 6
On
On
On
On
Off
Off
Off
On
On
Off
Off
On
On
Off
On
Off
On
Off
On
Off
On
First I/O Group
Number
4
6
0
2
Switch Selections
7 8
On
On
Off
Off
On
Off
On
Off
Allen-Bradley PLCs
2-5
Chapter 2
Installing Your Module
Figure 2.5
Module Switch Assembly Settings for PLC3 Family Processors
Address Switch Assembly
(S1)
O
F
F
O
N
1 2 3 4 5 6 7 8
I/O rack number
(Table 2.D)
First I/O group number
(Table 2.D)
Switch Position
1 2
ON OFF
OFF OFF
OFF
Maximum I/O chassis distance
57.6K Baud 10,000ft
115.2K Baud 5,000ft
ON 230.4K Baud 2,500ft
ON ON Not Used
1
1 230.4K Baud with 1775S5 revision A/G, and
1775SR5 revision A/G scanners only.
Switch Assembly (S2)
O
N
O
F
F
1 2 3 4 5 6
Always OFF
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Off
Link Response ON for series B emulation
OFF for unrestricted
ATTENTION: Link response switch must be ON when using the following scanner modules:
1775S4A
1775S4B
1775S5
1775SR5
1775SR
Scan On for all but last 4 slots
Off for all slots 10799I
Table 2.D
I/O Rack Switch Selections for the Address Switch Assembly
(PLC3 Family Processors)
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
00 On On On On On On 20 On Off On On On On 40 Off On On On On On 60 Off Off On On On On
01 On On On On On Off 21 On Off On On On Off 41 Off On On On On Off 61 Off Off On On On Off
02 On On On On Off On 22 On Off On On Off On 42 Off On On On Off On 62 Off Off On On Off On
03 On On On On Off Off 23 On Off On On Off Off 43 Off On On On Off Off 63 Off Off On On Off Off
04 On On On Off On On 24 On Off On Off On On 44 Of On On Off On On 64 Off Off On Off On On
05 On On On Off On Off 25 On Off On Off On Off 45 Off On On Off On Off 65 Off Off On Off On Off
06 On On On Off Off On 26 On Off On Off Off On 46 Off On On Off Off On 66 Off Off On Off Off On
07 On On On Off Off Off 27 On Off On Off Off Off 47 Off On On Off Off Off 67 Off Off On Off Off Off
10 On On Off On On On 30 On Off Off On On On 50 Off On Off On On On 70 Off Off Off On On On
11 On On Off On On Off 31 On Off Off On On Off 51 Off On Off On On Off 71 Off Off Off On On Off
12 On On Off On Off On 32 On Off Off On Off On 52 Off On Off On Off On 72 Off Off Off On Off On
13 On On Off On Off Off 33 On Off Off On Off Off 53 Off On Off On Off Off 73 Off Off Off On Off Off
14 On On Off Off On On 34 On Off Off Off On On 54 Off On Off Off On On 74 Off Off Off Off On On
15 On On Off Off On Off 35 On Off Off Off On Off 55 Off On Off Off On Off 75 Off Off Off Off On Off
16 On On Off Off Off On 36 On Off Off Off Off On 56 Off On Off Off Off On 76 Off Off Off Off Off On
Not valid 17 On On Off Off Off Off 37 On Off Off Off Off Off 57 Off On Off Off Off Off 77
1st I/O Group
Number
0
Switch Selections
7 8
On On
Note: Rack address 77 is an illegal configuration.
p
2
4
6
On
Off
Off
Off
On
Off
2-6
Chapter 2
Installing Your Module
Figure 2.6
Module Switch Assembly Settings for PLC5 Family Processors Without
Complementary I/O
O
N
O
F
F
Address Switch Assembly
(S1)
1 2 3 4 5 6 7 8
First I/O group number
(Table 2.E)
I/O rack number
(Table 2.E)
Switch Position
1 2
Maximum I/O chassis distance (see note)
ON OFF 57.6K Baud 10,000ft
OFF OFF 115.2K Baud 5,000ft
OFF ON 230.4K Baud 2,500ft
ON ON Not Used
Note: PLC5/15 and 5/25 processors operate at 57.6K baud only.
Switch Assembly
(S2)
O
F
F
O
N
1 2 3 4 5 6
Off
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Link Response on for series B emulation off for unrestricted
Scan on for all but last 4 slots off for all slots
Always OFF 10800I
Table 2.E
I/O Rack Selection for PLC5 Family Processors without Complementary I/O
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
00 On On On On On On 20 On Off On On On On
01 On On On On On Off 21 On Off On On On Off
02 On On On On Off On 22 On Off On On Off On
03 On On On On Off Off 23 On Off On On Off Off
04 On On On Off On On 24 On Off On Off On On
05 On On On Off On Off 25 On Off On Off On Off
06 On On On Off Off On 26 On Off On Off Off On
07 On On On Off Off Off 27 On Off On Off Off Off
10 On On Off On On On 30 On Off Off On On On
11 On On Off On On Off 31 On Off Off On On Off
12 On On Off On Off On 32 On Off Off On Off On
13 On On Off On Off Off 33 On Off Off On Off Off
14 On On Off Off On On 34 On Off Off Off On On
15 On On Off Off On Off 35 On Off Off Off On Off
16 On On Off Off Off On 36 On Off Off Off Off On
17 On On Off Off Off Off 37 On Off Off Off Off Off
1st I/O
Group
Number
0
2
4
6
PLC5/11 processors can scan rack 03.
PLC5/15 and PLC5/20 processors can scan racks 0103.
PLC5/25 and PLC5/30 processors can scan racks 0107.
PLC5/40 and PLC5/40L processors can scan racks 0117.
PLC5/60 and PLC5/60L processors can scan racks 0127.
PLC5/250 processors can scan racks 037.
Allen-Bradley PLCs
Switch
Selections
7 8
On
On
On
Off
Off
Off
On
Off
2-7
Chapter 2
Installing Your Module
Figure 2.7
Module Switch Assembly Settings for PLC5 Family Processors With
Complementary I/O
Address Switch Assembly
(S1)
O
F
F
O
N
1 2 3 4 5 6 7 8
First I/O group number
(Table 2.F)
I/O rack number
(Table 2.F)
ON Primary chassis
OFF Complementary chassis
Always ON
Switch Position
1 2
Maximum I/O chassis distance (see note)
ON OFF 57.6K Baud 10,000ft
OFF OFF 115.2K Baud 5,000ft
OFF ON 230.4K Baud 2,500ft
ON ON Not Used
Note: PLC5/15 and 5/25 processors operate at 57.6K baud only.
Switch Assembly
(S2)
O
N
O
F
F
1 2 3 4 5 6
Off
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Link Response on for series B emulation off for unrestricted
Scan on for all but last 4 slots off for all slots
ON Primary chassis
OFF Complementary chassis
10801I
Table 2.F
I/O Rack Selection for PLC5 Family Processors with Complementary I/O
I/O
Rack #
01
02
03
Switch
1 2 3 4 5 6
On On On On On Off
On On On On Off On
On On On On Off Off
04
05
On On On Off On On
On On On Off On Off
06
07
On On On Off Off On
On On On Off Off Off
See note below
Note: PLC5/11 can scan rack 03.
PLC5/20, PLC5/30, PLC5/40, PLC5/60 can scan racks 0107.
1st I/O Group
Number
4
6
0
2
Switch Selections
7 8
On
On
Off
Off
On
Off
On
Off
2-8
Chapter 2
Installing Your Module
Setting the I/O Chassis
Switches
After setting the adapter module switch assemblies, you must also
set the I/O chassis backplane switches
Setting the Backplane Switch Assembly
The backplane switch assembly is located on the backplane of the I/O chassis. You use it to select:
the last state of all outputs
the processor restart lockout feature
1/2-, 1- or 2-slot addressing
the last chassis in the I/O system (for PLC-2 family processors)
Refer to the table below for backplane switch setting illustrations for the various processors.
For Processor:
PLC2
PLC3
PLC5
PLC5 remote configuration
PLC5/250
Refer to:
Figure 2.8, page 29
Figure 2.9, page 210
Figure 2.10, page 210
Figure 2.11, page 211
Figure 2.12, page 211
Figure 2.8
I/O Chassis Backplane Switch Assembly Settings for Remote Adapter
Module in PLC2 Family Processor System
Last State Switch
When ON, outputs of this chassis remain in last state.
When OFF, outputs of this I/O chassis are deenergized when a fault is detected.
Processor Restart Lockout
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at the chassis.
Always OFF
Addressing Switch
ON 1slot addressing selected
OFF 2slot addressing selected
Always OFF
ATTENTION: Set switch 1 to the OFF position to deenergize outputs wired to this chassis when a fault is detected. If switch 1 is set to the ON position, outputs connected to this chassis remain in their last state when a fault occurs and machine motion may continue after fault detection.
Last Chassis Switch
ON Chassis does not contain the highest numbered I/O group for the associated rack number
OFF Chassis does contain the highest numbered I/O group for the associated rack number
If you have only a primary chassis, set this switch to OFF.
If you have both primary and complementary chassis, set the primary chassis to ON and the complementary chassis to OFF.
Allen-Bradley PLCs
10802I
2-9
Chapter 2
Installing Your Module
ATTENTION: Set switch 1 to the OFF position to deenergize outputs wired to this chassis when a fault is detected. If switch 1 is set to the ON position, outputs connected to this chassis remain in their last state when a fault occurs and machine motion may continue after fault detection.
Always OFF
Figure 2.9
I/O Chassis Backplane Switch Assembly Settings for Remote Adapter
Module in PLC3 Family Processor System
Last State Switch
When ON , outputs of this chassis remain in last state.
When OFF , outputs of this I/O chassis are deenergized when a fault is detected.
Processor Restart Lockout
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at the chassis.
1771A1/A1B chassis in PLC3 Backup
ON If any 1771A1/A1B chassis contains starting I/O group 0 with 2slot addressing and the PLC3 is configured in backup mode.
OFF All other times.
Addressing Switches
5 6
OFF
ON
OFF
ON
ON
OFF
OFF
ON
You select 1/2slot addressing
You select 1slot addressing
You select 2slot addressing
Not allowed
10802I
ATTENTION: Set switch 1 to the OFF position to deenergize outputs wired to this chassis when a fault is detected. If switch 1 is set to the ON position, outputs connected to this chassis remain in their last state when a fault occurs and machine motion may continue after fault detection.
Always OFF
Figure 2.10
I/O Chassis Backplane Switch Assembly Settings for Remote Adapter
Module in PLC5 Family Processor System
Last State Switch
When ON , outputs of this chassis remain in last state.
When OFF , outputs of this I/O chassis are deenergized when a fault is detected.
Processor Restart Lockout
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at the chassis.
Last Chassis Switch
ON Chassis does not contain the highest numbered I/O group for the associated rack number
OFF Chassis does contain the highest numbered
I/O group for the associated rack number
If you have only a primary chassis, set this switch to OFF.
If you have both primary and complementary chassis, set the primary chassis to ON and the complementary chassis to OFF.
Addressing Switches
5 6
OFF
ON
OFF
ON
ON
OFF
OFF
ON
You select 1/2slot addressing
You select 1slot addressing
You select 2slot addressing
Not allowed
1771A1/A1B chassis in PLC3 Backup
ON If any 1771A1/A1B chassis contains starting I/O group 0 with 2slot addressing and the PLC3 is configured in backup mode.
OFF All other times.
10802I
2-10
Chapter 2
Installing Your Module
ATTENTION: If switch 1 is set to the ON position, outputs connected to this chassis remain in their last state when a fault occurs and machine motion may continue after fault detection. We recommend that you set switch 1 to the OFF position to deenergize outputs wired to this chassis when a fault is detected.
Always OFF
Always OFF
Figure 2.11
I/O Chassis Backplane Switch Assembly Settings for Remote Adapter
Module in PLC5 Family Processor System in Remote Configuration
Last State Switch
When ON , outputs of this chassis remain in last state.
When OFF , outputs of this I/O chassis are deenergized when a fault is detected.
Processor Restart Lockout
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at the chassis.
Addressing Switches
5 6
OFF
ON
OFF
ON
ON
OFF
OFF
ON
You select 1/2slot addressing
You select 1slot addressing
You select 2slot addressing
Not allowed
10802I
ATTENTION: Set switch 1 to the OFF position to deenergize outputs wired to this chassis when a fault is detected. If switch 1 is set to the
ON position, outputs connected to this chassis remain in their last state when a fault occurs and machine motion may continue after fault detection.
Always OFF
Always OFF
Figure 2.12
I/O Chassis Backplane Switch Assembly Settings for Remote Adapter
Module in PLC5/250 Processor System
Last State Switch
When ON , outputs of this chassis remain in last state.
When OFF , outputs of this I/O chassis are deenergized when a fault is detected.
Processor Restart Lockout
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at the chassis.
Addressing Switches
5 6
OFF
ON
OFF
ON
ON
OFF
OFF
ON
You select 1/2slot addressing
You select 1slot addressing
You select 2slot addressing
Not allowed
10802I
Allen-Bradley PLCs
2-11
Chapter 2
Installing Your Module
Setting the I/O Chassis
Power Supply
Configuration Plug
You use the I/O chassis power-supply configuration plug (Figure 2.13) to identify the type of power supply you use with your remote chassis. This configuration plug is located on the backplane of series B I/O chassis.
Figure 2.13
Series B I/O Chassis Power Supply Configuration Plug Settings
For Use With: Set Chassis Configuration Plug to:
Y N power supply module installed in chassis
Y" position external power supply in your remote system
N" position
Y N Y N
USING
POWER SUPPLY
MODULE IN
THIS CHASSIS?
I/O Chassis
Power Supply
Configuration
Plug
Wiring the Field Wiring Arm
The field wiring arm provides connection points for:
I/O communication cables
a user-supplied I/O chassis restart pushbutton
The wiring arm pivots on the front of the chassis to connect with the module’s printed circuit board, allowing you to remove the adapter module without disconnecting the system wiring.
Connect input/output cables to the field wiring arm as shown in
Figure 2.14.
2-12
Chapter 2
Installing Your Module
Figure 2.14
Field Wiring Arm Connection Diagram
Remote I/O Cable
AllenBradley Cable (cat. no. 1770CD)
Blue
Shield
Clear
ATTENTION: Do not make connections to terminals 4 through 10. These terminals are connected internally (1 to 4, 2 to 5 and 3 to 6) and cannot be used for any other purpose.
User supplied
I/O rack restart pushbutton
7
8
9
5
6
10
11
1
2
3
4
12
1 Line 1
2 Shield Cable
3 Line 2
4 No connection
5 No connection
6 No connection
7 No connection
8 No connection
9 No connection
10 No connection
11 In
12 Ret
Reset
17343
ATTENTION: Do not remove or insert the adapter module from the I/O chassis while system power is on. Otherwise, you may damage module circuitry.
Terminals 1 and 4, 2 and 5, and 3 and 6 are internally connected on the module. If you use these terminals (4, 5, and 6) for connection of additional adapter modules, you disconnect the remaining adapter modules in the series connection when you disconnect the remote I/O adapter module wiring arm. If this is unsuitable for your application, make your connections to terminals 1, 2, and 3 only.
Allen-Bradley PLCs
2-13
Chapter 2
Installing Your Module
Installing the Terminator
If this is the last remote I/O adapter on the link, you must use a terminating resistor to terminate both ends of the remote I/O link (scanner end and last adapter end). The size of the terminator is determined by the system configuration.
Older configurations use a 150 ohm resistor at both ends. With newer products that can support it, you can use an 82 ohm terminator at both ends. The 82 ohm terminators provide “extended node” capability which allows you to have up to 32 physical devices on the RIO link. (The number of logical racks capable of being addressed by the scanner is not affected.)
This allows 1/4, 1/2 and 3/4 racks, Dataliners, Redipanels and Panelview devices to be attached to the link.
ATTENTION: Devices that are operating at 230.4K Baud must have 82 ohm terminators in place for proper operation.
Compatibility of 1771
Remote I/O Products with
Extended Node Numbers
Certain products are not compatible with the extended node capabilities obtained with the use of the 82 ohm terminator resistors. These products are listed below.
Table 2.G
Noncompatible Products
Device
Scanners 1771SN
1771SD
1772SD2
1775SR
1775S4A
1775S4B
Adapters 1771AS
1771ASB
1771DCM
Miscellaneous 1771AF
1771AF1
Series
All
All
All
All
All
All
All
All
All
Series A
All
2-14
Chapter 2
Installing Your Module
Module Installation
lockingbar pins
12453I front of chassis
Once you’ve determined the power requirements, keying, and wiring for your adapter module, and have set the appropriate switch assemblies, you can use the following procedure to install it.
Refer to the Programmable Controller Grounding and Wiring Guidelines
(publication 1770-4.1) for proper grounding and wiring methods to use when installing your module.
ATTENTION: Remove system power before removing or installing your module in the I/O chassis. Failure to observe this warning could damage module circuitry and injure people.
1.
Remove power from the I/O chassis before inserting (or removing) the module.
2.
On chassis equipped with a chassis locking bar, pull the locking-bar pins to release the locking bar and swing it up.
3.
Insert the module into slot.
4.
Place the module in the plastic tracks on the top and bottom of the leftmost slot. These slots guide the module into position.
5.
Press firmly and evenly to seat the module in its backplane connectors.
ATTENTION: Do not force the module into the backplane connector. If you cannot seat the module with firm pressure, check the alignment and keying. Forcing the module can damage the backplane connector or the module.
6.
Snap the chassis locking bar (or locking latch on earlier chassis) over the top of the module to secure it. Make sure the locking pins on the locking bar are fully engaged.
Note: The chassis locking bar will not close if all modules are not properly seated.
7.
Swing field wiring arm up into place and press firmly until it latches.
8.
Reapply system power and check for proper operation.
Allen-Bradley PLCs
2-15
Chapter 2
Installing Your Module
Summary
In this chapter you learned how to install your adapter module. Chapter 3 tells you how to configure your module.
2-16
Chapter
3
Addressing Modes for Your Remote I/O
Chapter Objectives
Hardware Addressing
When you configure your remote I/O system, you must consider:
how to address your I/O
what combination of I/O modules and I/O chassis you can use
These topics are discussed in this chapter.
Programmable controllers that use the 1771-ASB remote I/O adapter module can address their I/O in 2-slot, 1-slot or 1/2 slot I/O groups. These three addressing methods are referred to as 2-slot addressing, 1-slot addressing and 1/2-slot addressing.
You select the addressing method with switch 5 and 6 in the I/O chassis backplane switch assembly. You make this selection for each chassis independently with only one method of addressing for each chassis.
I/O groups are made up of I/O terminals (Figure 3.1). An I/O group is an addressing unit that can contain up to 16 input terminals and 16 output terminals. You select an I/O chassis to have either 2-slot, 1-slot or 1/2-slot
I/O groups.
Allen-Bradley PLCs
3-1
3-2
Chapter 3
Addressing Modes for Your Remote I/O
Figure 3.1
An I/O Group Up to 16 Input Terminals and 16 Output Terminals
In p u t
T e rm in a ls
0 7
1 0
1 2
1 3
0 2
0 3
0 4
0 5
1 6
1 7
O u tp u t
T e rm in a ls
0 2
0 3
0 5
0 6
0 7
1 0
1 2
1 3
1 6
1 7
O u tp u t o r
In p u t
T e rm in a ls
0 7
1 0
1 2
1 3
0 2
0 3
0 4
0 5
1 6
1 7
2slot I/O Group 1slot I/O Group
13073
I/O racks are made up of I/O groups (Figure 3.2). An I/O rack is an addressing unit that can contain up to eight I/O groups.
Figure 3.2
An I/O Rack Up to Eight I/O Groups
0 1 2 3 4 5 6 7
Power Source Not Indicated
13074
Chapter 3
Addressing Modes for Your Remote I/O
2Slot Addressing
Definition: The processor addresses two I/O module slots as one I/O group.
Concept: Each physical 2-slot I/O group is represented by a word in the input image table and a word in the output image table. Each input terminal corresponds to a bit in the input image table word and each output terminal corresponds to a bit in the output image table word.
The maximum number of bits available for one 2-slot I/O group is 32: 16 bits in the input image table and 16 bits in the output image table. The type of module you install (either 8 or 16-point I/O) determines the number of bits in the words that are used.
You select 2-slot addressing by setting switches 5 and 6 of the I/O chassis backplane switch assembly to the OFF position.
I/O Module Combinations
The combination of I/O modules you can use depends on the addressing method and I/O chassis you select.
Table 3.A lists acceptable I/O module combinations with 2-slot addressing.
I/O Chassis
Series
A, B
B or later only
Table 3.A
I/O Module Combinations With 2slot Addressing
I/O Module Combinations Per I/O Group
2 8point input modules
2 8point output modules
1 8point input and output module
1 8point input and 1 block transfer output module
1 block transfer and 1 8point output module
2 block transfer modules
1 16point input and output module
1 16point and 1 8point output module
1 8point input and 1 16point output module
Data Table Bits Used
Input Image Table Output Image Table
16
16
8
16
8
16
0
8
16
16
8
16
16
16
0
16
8
8
Allen-Bradley PLCs
3-3
3-4
Chapter 3
Addressing Modes for Your Remote I/O
Using Standarddensity I/O (8 point) Modules
Standard-density I/O modules provide eight input terminals or eight output terminals. Figure 3.3 illustrates the 2-slot I/O group concept with two
8-point input modules. Figure 3.4 shows an 8-point input module and an
8-point output module in a 2-slot I/O group.
Figure 3.3
Two 8point Input Modules Using One Word of the Input Image Table
2slot I/O Group
Input
Term inals
04
05
06
07
00
01
02
03
Input
Term inals
14
15
16
17
10
11
12
13
O utput im age table word corresponding to the I/O group.
unused
Input im age table word corresponding to the I/O group.
11867
Chapter 3
Addressing Modes for Your Remote I/O
Figure 3.4
8point Input and Output Modules Using Eight Bits of the Input Image
Table Word and Eight Bits of the Output Image Table Word
2slot I/O Group
Input
Term inals
04
05
06
07
00
01
02
03
O utput
Term inals
14
15
16
17
10
11
12
13
O utput im age table word corresponding to the I/O group.
O utput bits used unused
Input im age table word corresponding to the I/O group.
Always 0 14965 Input bits used
Using Highdensity (16 point) I/O Modules
16-point I/O modules provide 16 input terminals or 16 output terminals.
16-point I/O modules use a full word in the input or output image table when they are addressed as a 2-slot I/O group (Figure 3.5). Two 16-point modules (one input and one output) can be used in a 2-slot I/O group.
Allen-Bradley PLCs
3-5
3-6
Chapter 3
Addressing Modes for Your Remote I/O
Figure 3.5
16point Input and Output Modules Using Two Words of the Image Table
2slot I/O Group
Input
Term inals
O utput
Term inals
O utput im age table word corresponding to the I/O group.
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Input im age table word corresponding to the I/O group.
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
15559
Because these modules use a full word in the image table, the only type of module you can use in a 2-slot I/O group with a 16-point module is one that performs the opposite (complementary) function; an input module complements an output module and vice-versa.
You can use an 8-point module with a 16-point module in a 2-slot group; it must perform the opposite function. However, eight bits in the I/O image table are unused.
Chapter 3
Addressing Modes for Your Remote I/O
Identifying I/O Groups
You identify your I/O groups in one of three ways, depending on the addressing method and I/O chassis you use. Refer to:
Figure 3.6 for 2-slot addressing when using series A I/O chassis.
Figure 3.7 for 2-slot addressing when using series B I/O chassis.
Figure 3.13 for 1-slot addressing when using series B I/O chassis.
Input
Term inals
04
05
06
07
00
01
02
03
Left
Slot
Right
Slot
O utput
Term inals
14
15
16
17
10
11
12
13
Figure 3.6
Identifying 2slot I/O Groups with Series A I/O Chassis
2-slot
I/O G roup Example: Using I/O Group 0, a sample physical address
(with its corresponding data table address) is:
Physical Address
1 1 0 12
Type of I/O module
1 = Input
0 = Output
I/O Rack Number
Type of I/O module
1 = Input
0 = Output
I/O Rack Number
I/O Group
Number
Module
Terminal
Number
I/O Group
Number
Input im age table w ord corresponding to the I/O group.
1 1 0
Module
Terminal
Number
10808I
Allen-Bradley PLCs
3-7
3-8
Chapter 3
Addressing Modes for Your Remote I/O
Figure 3.7
Identifying 2slot I/O Groups with Series B I/O Chassis
R
G
1
0
0007
1017
G 0
0007
1017
Input
Term inals
Left
Slot
Right
Slot
2-slot I/O G roup
Example: Using I/O Group 0 and 16point modules, a sample physical address (with its corresponding data table address) is:
Physical Address
1 1 0 12
Type of I/O module
1 = Input
0 = Output
I/O Rack Number
Module
Terminal
Number
I/O Group
Number
O utput
Term inals
Input im age table w ord corresponding to the I/O group.
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 1 1 0
Module
Terminal
Number
Rules for module terminal point assignments are:
Standard density discrete I/O module in the left slot has terminals numbered 0007. (Mark top only.)
Standard density discrete I/O module in the right slot has terminals numbered 1017. (Mark bottom only.)
High density (16point) discrete I/O module in either slot has terminals numbered 0007 and 1017.
Type of I/O module
1 = Input
0 = Output
I/O Rack Number
I/O Group
Number
10809I
Chapter 3
Addressing Modes for Your Remote I/O
Complementary I/O with
2Slot Addressing
Some processors support a complementary I/O configuration. Refer to the user manual for your processor to see if it supports this type of configuration.
You configure complementary I/O by duplicating an I/O rack number of one I/O chassis (primary) in another I/O chassis (complementary), I/O group for I/O group. The I/O modules in the complementary chassis perform the opposite function of the corresponding modules in the primary chassis.
With 2-slot addressing you install, as a pair, the same type of 8-point I/O module in an I/O group of the primary chassis. You install, as a pair, the opposite type of 8-point I/O module in the corresponding I/O group of the complimentary chassis.
For example, with an I/O chassis set for 2-slot addressing, place two
8-point input modules in I/O group 0 of the primary chassis. In I/O group 0 of the complementary chassis, place two 8-point output modules
(Figure 3.8). Use the same type of 8-point I/O modules in both slots of a single I/O group.
P rim a ry 1 6 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 6 -s lo t C h a s s is
I
8
0
I
8
O
8
Figure 3.8
Example of Complementary I/O Configuration with 2slot Addressing
O
8
I
16
O
16
O
8
O
8
BT
I
O
8
8
BT
2
BT O
8
Double-slot
BT
Double-slot
BT
1 2
O
8
O
8
I
8
I
8 P
T
E
M
Y
P
T
E
M
Y
3 4
O
8
1
O
8
E x a m p le A
P
T
E
M
Y 3
O
8
3
5
P
T
E
M
Y
3
P
T
E
M
Y
3
6
P
T
E
M
Y
3
O
8
7
P
T
E
M
Y 3
O
8
I
16
O
16
I
16
O
16
I
16
O
16
I
16
O
16
I
16
O
16
I
16
O
16
I
16
O
16
I
16
O
16
P rim a ry 1 6 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
0 1 2 3 4 5 6
C o m p le m e n ta ry
C h a s s is N o t
A llo w e d
E x c e p t fo r O u tp u t
O u tp u ts in th e c o m p le m e n ta ry c h a s s is u s e th e s a m e b its in th e o u tp u t im a g e ta b le a s th e o u tp u ts in th e p rim a ry c h a s s is .
E x a m p le B
I = Input M odule
O = O utput M odule
BT = Block transfer M odule
1 O utput m odules use the sam e output im age table bits
2 C an be 8-point input or output m odule or single-slot block transfer m odule Allen-Bradley PLCs
7
13079
3-9
Chapter 3
Addressing Modes for Your Remote I/O
Follow these guidelines when configuring your remote system with complementary I/O chassis:
Assign the complementary I/O rack number to a chassis of equal or smaller size than the primary chassis.
If the complementary chassis is smaller than the primary one, set the last chassis switch on the complementary chassis to the ON position, unless the adapter is in the faulted I/O search mode.
For PLC-2 family processors:
Connect the complementary chassis to the same scanner channel as the primary chassis.
Connect the complementary chassis to the remote trunkline as though they were additional primary chassis.
For PLC-3 processors, connect the complementary chassis to a different scanner channel as the primary chassis.
Assign the same beginning I/O group number to both I/O racks.
You cannot configure complementary I/O in a chassis that uses a combination of 2-slot addressing and 16-point I/O.
You cannot use 32-point I/O modules in a complementary I/O configuration when you select 2-slot or 1-slot addressing.
You can place an output module opposite another output module; they reflect the same bits in the output image table.
Do not place an input module opposite an input module.
You can use the following modules in either primary or complementary I/O chassis opposite any type of module:
Catalog Number
1771E1, E2, E3
1771E4
1771IY
1771ES
1771KA2
1771KE
1771KG
1771OJ
1771AF
Description
Analog Input Expander Assembly
Analog Output Expander Assembly
Thermocouple Input Expander Module Assembly
Servo (Encoder Feedback) Expander Assembly
Communication Adapter Module
Communication Controller Module
PLC2 Family/RS232C Interface Module
Pulse Output Expander Assembly
Fiber Optics Converter Module
3-10
Chapter 3
Addressing Modes for Your Remote I/O
P rim a ry 1 6 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 6 -s lo t C h a s s is
Module Placement with 2slot Addressing
Figure 3.9 shows possible module placement when configuring complementary I/O with 2-slot addressing.
I
8
0
I
8
O
8
O
8
O
8
I
8
1
O
8
Figure 3.9
Complementary I/O Configurations with 2slot Addressing
I
16
O
16
O
8
O
8
BT
I
O
8
8
BT
2
BT O
8
Double-slot
BT
Double-slot
BT
2
I
8 P
T
E
M
Y
P
T
E
M
Y
3 4
O
8
1
O
8
E x a m p le A
E
M
P
T
Y 3
O
8
3
5
P
T
E
M
Y
3
P
T
E
M
Y
3
6
P
T
E
M
Y
3
O
8
7
P
T
E
M
Y 3
O
8
P rim a ry 1 6 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
C h a s s is N o t
A llo w e d
E x c e p t fo r O u tp u t
I
16
O
16
0
I
16
1
O
16
I
16
2
O
16
I
16
3
O
16
I
16
4
O
16
I
16
5
O
16
I
16
6
O
16
I
16
O u tp u ts in th e c o m p le m e n ta ry c h a s s is u s e th e s a m e b its in th e o u tp u t im a g e ta b le a s th e o u tp u ts in th e p rim a ry c h a s s is .
7
O
16
E x a m p le B
I = Input M odule
O = O utput M odule
BT = Block transfer M odule
1 O utput m odules use the sam e output im age table bits
2 C an be 8-point input or output m odule or single-slot block transfer m odule
3 M ust be em pty if corresponding prim ary slot is block transfer m odule
13079
Follow these guidelines when you select 2-slot addressing:
Place an 8-point output module opposite a 16-point input module.
An I/O group having a 16-point input and output module cannot have a corresponding I/O group in the complementary chassis.
You can place an output module opposite another output module; they reflect the same bits in the output image table.
You can use block-transfer modules in a complementary I/O system, with these restrictions:
When using double-slot block-transfer modules:
The left slot of the complementary I/O group must be empty.
You can only place an 8-point output module (if any) in the right Allen-Bradley PLCs
3-11
Chapter 3
Addressing Modes for Your Remote I/O
When using single-slot block-transfer modules:
The right slot of the primary I/O group can be another single-slot block-transfer module, or an 8-point input or output module.
The left slot of the complementary I/O group must be empty.
You can place an 8-point output module in the right slot of the complementary I/O group; this slot must be empty if the corresponding slot in the primary I/O group is a single-slot block-transfer module.
When you select 2-slot addressing, each pair of slots (one I/O group) is assigned to the corresponding pair of words in the input and output image tables. You assign one I/O rack number to eight I/O groups (Figure 3.10).
Figure 3.10
I/O Image Table and Corresponding Hardware for One Assigned Rack
Number with 2slot Addressing
O u tp u t Im a g e T a b le
W o rd #
6
7
4
5
2
3
0
1
0
0 1
1 2
2 3
3
4
4
5
5
6
6
7
7
I/O Group Designation
An I/O chassis containing 16point modules
NOTE: M odules can also be installed like this: I O O I
I O I O I O I O I O I O I O I O Input/Output Designation
In p u t Im a g e T a b le W o rd #
6
7
4
5
2
3
0
1
14966
3-12
1Slot Addressing
Chapter 3
Addressing Modes for Your Remote I/O
Definition: The processor addresses one I/O module slot as one I/O group.
Concept: The physical address of each I/O group corresponds to an input and output image table word. The type of module you install (8, 16, or
32-point) determines the number of bits in these words that are used.
You select 1-slot addressing by setting switches 5 and 6 of the I/O chassis backplane switch assembly:
switch 5 to the ON position
switch 6 to the OFF position
With 1-slot addressing, because 16 input AND 16 output bits are available in the processor’s image table for each I/O slot, you can use any mix of 8 or 16-point I/O modules in the I/O chassis.
To use 32-point I/O modules with 1-slot addressing, you must install, as a pair, an input module and an output module in 2 adjacent slots of the I/O chassis beginning with I/O slot 0 (figure 3.8). If you cannot pair the modules in this way, one of the two slots of the pair must be empty. For example, if I/O slot 0 holds a 32-point input module, I/O slot 1 can hold an
8, 16, or 32-point output module (or a module that uses the backplane for power only); otherwise, it must be empty.
Figure 3.11
Using 32point I/O Modules with 1slot Addressing
I/O I/O I/O
Input/Output Pairs
I/O I/O I/O I/O I/O
0 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5
I/O Chassis Slot Number
14973
Allen-Bradley PLCs
3-13
Chapter 3
Addressing Modes for Your Remote I/O
Thirty-two-point I/O modules need 32 input or 32 output bits in the processor’s image table. Because only 16 input and 16 output bits are available for each I/O group, to address a 32-point I/O module, the remote
I/O adapter module uses the unused input or output word associated with the adjacent I/O slot.
Refer to Figure 3.12. When the 1771-ASB remote adapter module addresses a 1-slot I/O group containing a 32-point I/O module, the adapter module uses the unused word assigned to the adjacent I/O module slot. For example, the adapter module uses the unused input word associated with
I/O slot 1 (because that slot must hold an output module and does not use its input word).
Figure 3.12 illustrates the concept of 1-slot addressing with two 32-point
I/O modules.
Figure 3.12
1slot I/O Group Concept With 32point I/O Modules
32-point I/O M odules
Im age Table
W ords Allocated for I/O G roup 0
Input W ord 0
O utput W ord 0
Im age Table
W ords Allocated for I/O G roup 1
Input W ord 1
O utput W ord 1
Slot 0
Input M odule
I/O G roup 0
Slot 1
O utput M odule
I/O G roup 1
14258
3-14
Chapter 3
Addressing Modes for Your Remote I/O
Identifying I/O Groups
You identify your I/O groups in one of three ways, depending on the addressing method and I/O chassis you use. Refer to Figure 3.13 for 1-slot addressing when using series B I/O chassis.
Figure 3.13
Identifying 1slot I/O Groups with Series B I/O Chassis
I/O Rack Number
I/O Group
Number
R
G
1
0
0007
1017
G 1
0007
1017
Example: Using I/O Group 0 and 16point modules, a sample physical address (with its corresponding data table address) is:
Physical Address
0 1
0 2
0 3
0 4
0 6
0 7
1 1
1 2
1 3
1 4
1 5
1 7
In p u t
T e rm in a ls
2 -s lo t I/O G ro u p I/O Group 0 1 1 0 12
1 1 1 12
Type of I/O module
1 = Input
0 = Output
I/O Rack Number
I/O Group 1
Module
Terminal
Number
I/O Group
Number
In p u t
T e rm in a ls
In p u t im a g e ta b le w o rd c o rre s p o n d in g to th e I/O g ro u p .
0 1
0 2
0 4
0 5
0 6
0 7
1 1
1 2
1 3
1 4
1 5
1 7
1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0
1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0
Module
Terminal
Number
Type of I/O module
1 = Input
0 = Output
I/O Rack Number
I/O Group
Number
Rules for module terminal point assignments are:
Standard density discrete I/O module in the left slot has terminals numbered 0007. (Mark top only.)
High density (16point) discrete I/O module in either slot has terminals numbered 0007 and 1017.
Allen-Bradley PLCs
1 1 0
1 1 1
I/O Group 0
I/O Group 1
10810I
3-15
Chapter 3
Addressing Modes for Your Remote I/O
Module Placement with 1slot Addressing
Figure 3.14 shows possible module placement for complementary I/O with
1-slot addressing.
Figure 3.14
Complementary I/O Configurations with 1slot Addressing
P rim a ry 1 6 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 6 -s lo t C h a s s is
I
0
O
1
O
I O O
I
2 3
I O
4
I O
5
I
O
1
BT
D ouble-slot
BT
6 7 0 1
O
1
P
T
E
M
Y 3
E x a m p le A
E
M
P
T
Y
3
I, O ,
BT
2
I
2
O
3
I
O
4
I I
5
O O
O O
6
I
7
I
3-16
P rim a ry 1 6 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 6 -s lo t C h a s s is
I
0
O
1
I
2
I
3
I
4
I
5
I
O O O O O
I = Input M odule (8- or 16-point)
O = O utput M odule (8- or 16-point)
BT = Block transfer M odule
6
I
7
I
0
I
1
I
2
I
3
I
O O O O O O
4
I
5
I
O O
6
I
7
I
O O
E x a m p le B
1 O utput m odules use the sam e output im age table bits
2 Can be input or output m odule (8- or 16-point) single-slot block tran fer m odule
3 M ust be em pty if corresponding prim ary slot is block transfer m odule s
13080
Follow these guidelines when you select 1-slot addressing:
Place input modules opposite output modules; place output modules opposite input modules.
You can use 8-point or 16-point I/O modules.
Output modules placed opposite output modules reflect the same bits in the output image table.
You can use block-transfer modules in a complementary I/O configuration with 1-slot addressing. Remember that when you select 1-slot addressing, an I/O group is one module slot. Use block-transfer modules with these restrictions:
Chapter 3
Addressing Modes for Your Remote I/O
When using double-slot block-transfer modules:
- The left slot of the two corresponding I/O groups must be empty.
- You can place any single-slot I/O module in the right slot of the two corresponding I/O groups.
When using single-slot block-transfer modules, the corresponding I/O group must be empty.
Assigning I/O Rack
Numbers with 1Slot
Addressing
I/O Group
Number
The following rules apply when you assign I/O rack numbers:
When you select 1-slot addressing, set switches of switch assembly S1 to assign the first I/O rack number of the chassis. The remote I/O adapter module automatically assigns the next higher I/O rack number to the remaining I/O groups of the chassis.
For example, if you want a 16-slot chassis that you set for 1-slot addressing to begin with I/O rack number 0, set switches of switch assembly S1 for I/O rack number 0. The adapter module automatically assigns I/O rack number 1 to the remaining I/O groups of the chassis
(Figure 3.15).
Assigned I/O Rack
Number 0
Figure 3.15
Assigning I/O Rack Numbers with 1slot Addressing
Assigned I/O Rack
Number 1
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
Set switches of switch assembly S1 on the remote I/O adapter module for I/O rack number 0. The adapter automatically assigns I/O rack number 1 to the remaining I/O group of the chassis.
13077
1771A4B I/O Chassis using 1slot addressing
You assign one I/O rack number to eight I/O groups, regardless of which Allen-Bradley PLCs
3-17
Chapter 3
Addressing Modes for Your Remote I/O
When you select 1-slot addressing, each individual slot (one I/O group) is assigned to the corresponding word in the input or output image tables.
You assign one I/O rack number to eight I/O groups (Figure 3.16).
Figure 3.16
I/O Image Table and Corresponding Hardware for One Assigned Rack
Number with 1slot Addressing
O utput Im age Table
W ord #
6
7
4
5
2
3
0
1
0 1 2 3 4 5 6 7 I/O Group Designation
Not
Used
An I/O chassis with 1slot addressing
I I I I O O O O Input/Output Designation
W ord #
2
3
0
1
6
7
4
5
Input Im age Table
Always
0
14967
3-18
Chapter 3
Addressing Modes for Your Remote I/O
1/2 Slot Addressing
Definition: The processor addresses one-half of an I/O module slot as one
I/O group.
Concept: The physical address of each I/O slot corresponds to two input and two output image table words. The type of module you install (8-, 16-, or 32-point) determines the number of bits in these words that are used.
You select 1/2-slot addressing by setting switches 5 and 6 of the I/O chassis backplane switch assembly:
switch 5 to the OFF position
switch 6 to the ON position
With 1/2-slot addressing, since 32 inputs bits AND 32 output bits are available in the processor’s image table for each I/O group, you can mix 8,
16 and 32-point I/O modules in any order in the I/O chassis.
Figure 3.17 illustrates the 1/2-slot addressing concept with a 32-point I/O module. A 32-point I/O module (with 1/2-slot I/O groups) uses two words of the image table. When you use 8 and 16-point I/O modules with 1/2-slot addressing, you get fewer total I/O points.
1 /2 -slo t
I/O G ro u p
0
1 /2 -slo t
I/O G ro u p
1
In p u t
0 1
0 3
0 5
0 7
-
1 1
1 3
1 5
1 7
-
0 1
0 3
0 5
0 7
-
1 1
1 3
1 5
1 7
-
#
Figure 3.17
1/2slot Addressing Concept
3 2 -p o in t In p u t M o d u le
In p u t
0 0
0 2
0 4
0 6
-
1 0
1 2
1 4
1 6
-
0 0
0 2
0 4
0 6
-
1 0
1 2
1 4
1 6
-
#
1 /2 -slo t
I/O G ro u p
0
1 /2 -slo t
I/O G ro u p
1
1 7
In p u t W o rd 0
1 0 7
1 7
O u tp u t W o rd 0
1 0 7
U n u se d
In p u t W o rd 1
1 7 1 0 7
1 7
O u tp u t W o rd 1
1 0 7
U n u se d
0
0
0
0
Im a g e T a b le
W o rd s A llo ca te d fo r I/O G ro u p 0
Im a g e T a b le
W o rd s A llo ca te d fo r I/O G ro u p 1
Allen-Bradley PLCs 14259
3-19
Chapter 3
Addressing Modes for Your Remote I/O
Assigning I/O Rack Numbers with 1/2slot Addressing
The following rules apply when you assign I/O rack numbers for 1/2-slot addressing:
One assigned I/O rack number is made up of eight I/O groups
(Figure 3.18).
The maximum number of I/O racks you can assign to the different chassis sizes are:
one I/O rack to 1771-A1B chassis
two I/O racks to 1771-A2B chassis
three I/O racks to 1771-A3B chassis
four I/O racks to 1771-A4B chassis
You can mix addressing methods in your remote system on a chassis-by-chassis basis (1-slot and 1/2-slot addressing with 32-point
I/O modules).
You cannot assign one I/O rack number to more than one I/O chassis when you select 1/2-slot addressing.
Each I/O chassis begins an assigned I/O rack number. Make sure that you set switches 7 and 8 of switch assembly SW1 to the ON position when you select 1/2-slot addressing. The remote I/O adapter module automatically assigns the next higher I/O rack number(s) to the remaining I/O groups of the chassis.
3-20
Chapter 3
Addressing Modes for Your Remote I/O
0
1
2
3
4
5
6
7
Figure 3.18
I/O Image Table and Corresponding Hardware for One Assigned Rack
Number with 1/2slot Addressing
O utput Im age Table
W ord #
2
3
0
1
4
5
6
7
I/O Group Designation
Not
Used
An I/O chassis with 1/2slot addressing
I I O O Input/Output Designation
W ord #
3
4
5
6
7
0
1
2
Input Im age Table
Always
0
14974
Allen-Bradley PLCs
3-21
Chapter 3
Addressing Modes for Your Remote I/O
Complementary I/O with
1/2Slot Addressing
Some processors support a complementary I/O configuration. Refer to the user’s manual for your processor to see if it supports this type of configuration.
You configure complementary I/O by duplicating an I/O rack number of one I/O chassis (primary) in another I/O chassis (complementary), I/O group for I/O group. The I/O modules in the complementary chassis perform the opposite function of the corresponding modules in the primary chassis.
Module Placement with 1/2slot Addressing
Figure 3.19 shows possible module placement for a complementary I/O configuration with 1/2-slot addressing.
Figure 3.19
Complementary I/O Configuration with 1/2slot Addressing
P rim a ry 1 2 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 2 -s lo t C h a s s is
I I O
0 1
O
2 3
O
4 5
I
O
6 7
I
I O O
1
4 5
BT
0 1
O
2 3
I O
E x a m p le A
1
6 7
P
T
E
M
Y 3
Double-slot
BT
0 1
E
M
P
T
Y 3
2 3
I, O ,
BT
2
I
O
4 5
I
6 7
O
I = Input M odule
O = O utput M odule
P rim a ry 1 2 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 2 -s lo t C h a s s is
I I I I I I I I I I I I
0 1
O
2 3
O
4 5
O
6 7
O
0 1
O
2 3
O
4 5
O
6 7
O
0 1
O
2 3
O
4 5
O
6 7
O
BT = Block transfer M odule
E x a m p le B
1 O utput m odules use the sam e output im age table bits
2 Can be input or output m odule (8- or 16-point) single-slot block tran fer m odule
3 M ust be em pty if corresponding prim ary slot is block transfer m odule
14261
3-22
Chapter 3
Addressing Modes for Your Remote I/O
Mixing 1 and 2Slot
Addressing in Individual
Chassis
0 1
Follow these guidelines when you select 1/2-slot addressing:
Place input modules opposite output modules; place output modules opposite input modules.
You can use 8, 16 and 32-point I/O modules.
Output modules placed opposite output modules reflect the same bits in the output image table.
You can use block-transfer modules in a complementary I/O configuration with 1/2-slot addressing. Use block-transfer modules with these guidelines:
When using double-slot block-transfer modules in the primary chassis:
- The left-most slot of the two corresponding I/O slots in the complementary chassis must be empty.
- You can place any single-slot I/O module in the right slot of the two corresponding I/O slots of the complementary chassis
When using single-slot block-transfer modules, the corresponding
I/O slot in the complementary chassis must be left empty.
You can have a mix of 1-slot and 2-slot addressing in individual chassis assigned one I/O rack number (with up to eight I/O groups). For example: you can select 2-slot addressing for a 1771-A2B I/O chassis and 1-slot addressing for a 1771-A1B chassis to make up one assigned I/O rack number (Figure 3.20).
Figure 3.20
Mixing Addressing Methods in Chassis Assigned One I/O Rack Number
One Assigned I/O Rack Number
2 3 4-5 6-7
1771A2B I/O Chassis using 2slot addressing
1771A1B I/O Chassis using 1slot addressing
Allen-Bradley PLCs
13126
3-23
Chapter 3
Addressing Modes for Your Remote I/O
Acceptable Chassis
Combinations
Not all chassis combinations are acceptable in making I/O rack number assignments. For example, a 1771-A4B I/O chassis cannot complete an assigned I/O rack number that starts in a 1771-A1 I/O chassis. Refer to
Table 3.B for acceptable beginning I/O group numbers when making your
I/O rack number assignments.
Table 3.B
Acceptable Beginning I/O Group Numbers
If you select:
2slot addressing
1slot addressing
1/2slot addressing and:
The beginning I/O group number can be:
4slot chassis
8slot chassis
0, 2, 4, 6
0, 2, 4
12slot chassis 0, 2
16slot chassis 0
4slot chassis 0, 2, 4, 6
8slot chassis 0, 2, 4, 6
12slot chassis 0, 2, 4,
16slot chassis 0
4slot chassis 0
8slot chassis 0
12slot chassis 0
16slot chassis 0
3-24
Chapter 3
Addressing Modes for Your Remote I/O
I/O Chassis/Adapter Module
Combinations
Table 3.C shows the addressing methods you can achieve with the Series B chassis and the various remote I/O adapter modules.
Table 3.C
Series B Chassis/Adapter Module Combinations
Remote I/O Adapter
Module Catalog
Number
I/O Points
Per
Module
Addressing Mode
2Slot 1Slot 1/2Slot
1771AS
32
8
8
16
Yes
*
No
Yes
No
No
No
Yes 1771ASB
Series A
16
32
8
*
No
Yes
Yes
No
Yes
No
No
Yes 1771ASB
Series B, C and D
16
32
*
No
Yes
*
Yes
Yes
* Conditional module placement: you must use an input module and an output module in two adjacent slots of the I/O chassis beginning with slot 0.
IMPORTANT: Series A I/O chassis let you use 2slot addressing with
8point I/O modules only, regardless of the type of adapter module you use. This chart is valid for series B I/O chassis. You need series B I/O chassis to achieve 1slot and 1/2slot addressing with 16point and
32point I/O modules.
No
No
No
No
Summary
In this chapter we discussed how to address your hardware and the various remote I/O configurations and options you can use in your remote system.
Allen-Bradley PLCs
3-25
Chapter
4
Troubleshooting
Chapter Objectives
Troubleshooting With the
Indicator Lights
In this chapter, you will learn how to use the indicators on the module frontplate for troubleshooting the module.
The module has three indicators on the front plate, as shown in Figure 4.1.
Use these indicators for troubleshooting the module. The following table describes problems that may occur, probable causes, and recommended courses of action.
Figure 4.1
Module Indicators
ACTIVE
ADAPTER
FAULT
I/O RACK
FAULT
Green ACTIVE Indicator
Red ADAPTER FAULT Indicator
Red I/O RACK FAULT Indicator
10811-I
4-1
Chapter 4
Troubleshooting
Table 4.A
Remote I/O System Troubleshooting Guide
Indicators
Active Adapter I/O
Fault Rack
On Off Off
Off On Off
Description
Normal indication; remote adapter is fully operational
Adapter crash.
On
Blink in unison Off
On
Off
Blink
LEDs sequence on/off from top to bottom
Blink alternately
Off
Blink
Blink
On
On
Off
Off
Off
Off
On
On
Off
Off
On
On
Module placement error
Incorrect starting I/O group number
Module not communicating
Module not communicating
Remote adapter not actively controlling
I/O (scanner to adapter communication link is normal)
Adapter module not actively controlling
I/O 2
Adapter module in processor restart lockout mode (adapter to scanner link is normal) 5
4
Module not communicating
I/O chassis fault.
link.
Communication on link. Chassis violation.
2 No communication on
Probable Cause Recommended Action
RAM memory fault.
Watchdog timeout
I/O module in incorrect slot.
Error in starting I/O group number or I/O rack address
Incorrect baud rate setting
Scan switch set for "all but last 4 slots" in
1/4 rack
Processor is in program or test mode
Scanner is holding adapter module in fault mode
Another remote I/O adapter with the same address is on the link.
Processor restart lockout switch on chassis backplane switch assembly on 1
Problem exists between:
•
• adapter and module in chassis; the module will stay in fault mode until fault is corrected shorted printed circuit board runs on backplane or I/O module
Possible shorted backplane in chassis.
Excessive noise on backplane.
6
Cycle power. Replace module if problem reoccurs.
Place module in correct slot in chassis.
Check dipswitch settings. Refer to table
3.B to verify acceptable beginning I/O group number; set switches correctly
Check dipswitch setting
Reset scan switch setting
Fault should be cleared by I/O scanner
Correct the address.
Depress reset button to clear lockout feature or cycle power; if after repeated attempts indicators are still blinking, check:
• pushbutton not wired properly to field wiring arm
• wiring arm not connected to adapter module
• adapter module was reset by processor/scanner, then immediately faulted
Cycle power to the chassis to clear a problem resulting from high noise 3
• remove and replace all I/O modules one at a time
• if problem does not clear, something is wrong in chassis or I/O module
Check chassis, Replace chassis as necessary.
4-2
Allen-Bradley PLCs
Chapter 4
Troubleshooting
Indicators
Active Adapter I/O
Fault Rack
Blink On Off
Description
Module identification line fault
Probable Cause Recommended Action
Off Off Off Module not communicating
Excessive noise on backplane
Power supply fault
Verify power supply and chassis grounding
Check power supply, cable connections, and make sure adapter module is fully seated in chassis.
Correct cable and wiring defects Wiring from scanner to adapter module disrupted
Scanner not configured properly
One faulted chassis within a rack group address causing scanner/distribution panel to fault all chassis in rack group address (when in disable search mode)
Refer to publication 1772-2.18 for scanner configuration
Check sequentially from the first module to the last module to pinpoint fault; correct any faults and proceed to the next chassis
1. You must select the operating mode of the remote I/O adapter module as outlined in the publication furnished with the remote I/O scanner/distribution panel, remote I/O scanner-program interface module, or I/O scanner-message handling module. Pay close attention to the disable search mode in the 1771-SD, -SD2.
2. The I/O chassis is in faulted mode as selected by the last state switch on the chassis backplane.
3. Cycling power clears the block-transfer request queue. All pending block transfers are lost. Your program must repeat the request for block transfers from the chassis.
4. If a fault occurs and the processor is in the run mode but is actually operating in the dependent mode, the chassis fault response mode is selected by the last state switch on the chassis backplane.
5. The I/O chassis is in faulted mode as selected by the last state switch on the chassis backplane.
6. If excessive chassis faults occur, check switch SW2, position 6 for the OFF position.
Summary
In this chapter you learned how to use the indicators on the front of the module to troubleshoot your module.
4-3
Appendix
A
Specifications
Module Location
Chassis Distance
Interconnect Cable
Power Dissipation
Thermal Dissipation
Backplane Current
Keying
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Field Wiring Arm
Field Wiring Arm Screw Torque
1771 I/O chassis, leftmost slot
2500 ft @ 230.4K Baud
5000 ft @ 115.2K Baud
10000 ft @ 57.6K Baud
1770-CD
5 Watts
17.06 BTU/hr
1.0A @ 5V
Upper connector: between 54 and 56
Lower connector: between 16 and 18
0 o to 60 o
-40 o
C (32
to 85 o o to 140
C (-40 o o F)
to 185 o F)
5% to 95% (without condensation)
Cat. No. 1771-WB
79 inchpounds
Allen-Bradley PLCs
A-1
Appendix
B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
General Information
This appendix provides information on previous remote I/O adapters supplied by Allen–Bradley. The following table lists the adapter and respective figure reference.
Figure Description
B.1
Keying Diagram for 1771-ASB series A, B and C
B.2
Keying Diagram for 1771-AS
B.3
B.4
B.5
B.6
B.7
B.8
B.9
B.10
B.11
B.12
B.13
Field Wiring Arm Connection for 1771-AS, -ASB series A, B and C
Applies to:
1771-ASB series A, B and C
1771-AS
1771-AS
1771-ASB series A, B and C
1771-AS
1771-ASB series A, B
Module Switch Assembly Settings for 1771-AS, -ASB series A and B
Adapter for PLC-2 Family Processors
Module Switch Assembly Settings for 1771-ASB series C Adapter for
PLC-2 Family Processors
Module Switch Assembly Settings for 1771-AS and 1771-ASB series
A and B Adapters for PLC-3 Family Processors
Module Switch Assembly Settings for 1771-ASB series C Adapters for
PLC-3 Family Processors
Module Switch Assembly Settings for 1771-AS and 1771-ASB series
A and B Adapters for PLC-5 Family Processors without
Complementary I/O
Module Switch Assembly Settings for 1771-ASB series C Adapters for
PLC-5 Family Processors without Complementary I/O
Module Switch Assembly Settings for 1771-AS, -ASB series A and B
Adapters for PLC-5 Family Processors with Complementary I/O
Module Switch Assembly Settings for 1771-ASB series C Adapters for
PLC-5 Family Processors with Complementary I/O
I/O Chassis Backplane Switch Assembly Settings for 1771-AS
Remote Adapter Module in PLC-2 Family Processor System
I/O Chassis Backplane Switch Assembly Settings for 1771-AS
Remote Adapter Module in PLC-3 Family Processor System
1771-ASB series C
1771-AS
1771-ASB series A, B
1771-ASB series C
1771-AS
1771-ASB series A, B
1771-ASB series C
1771-AS
1771-ASB series A, B
1771-ASB series C
1771-AS
1771-AS
B-1
B-2
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.1
Keying Diagram for 1771-ASB series A, B and C
42
44
46
48
34
36
38
40
50
52
54
56
26
28
30
32
18
20
22
24
10
12
14
16
8
6
4
2
1
10
12
14
16
8
6
4
2
2
22
0
8
Insert keying bands between: upper connector - 54 and 56 lower connector - 16 and 18
Figure B.2
Keying Diagram for 1771-AS Remote I/O Adapter
12252
42
44
46
48
34
36
38
40
50
52
54
56
26
28
30
32
18
20
22
24
10
12
14
16
8
6
4
2
1
10
12
14
16
8
6
4
2
2
22
0
8
Insert keying bands between: upper connector - 44 and 46 lower connector - 20 and 22
Allen-Bradley PLCs
12252
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.3
Field Wiring Arm Connection Diagram for 1771-AS, -ASB series A, B and C
Blue
Shield
Clear
Allen-Bradley Cable (cat. no. 1770-CD)
WARNING: Do not make connections to terminals
4 through 10. These terminals are connected internally (1 to 4,
2 to 5 and 3 to 6) and cannot be used for any other purpose.
User supplied
I/O rack restart pushbutton
10
11
8
9
5
6
7
1
2
3
4
12
1 Line 1
2 Shield Cable
3 Line 2
4 No connection
5 No connection
6 No connection
7 No connection
8 No connection
9 No connection
10 No connection
11 In
Reset
12 Ret
17343
B-3
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.4
Module Switch Assembly Settings for 1771-AS, -ASB series A and B
Adapter for PLC-2 Family Processors
B-4
O
F
F
Address Switch Assembly
(SW-1)
1 2 3 4 5 6 7 8
Switch Assembly
(SW-2)
O
N
O
F
F
1 2 3 4
First I/O group number
(Table B.A)
I/O rack number
(Table B.A)
SD - always ON
SD2 - without complementary I/O
- always ON
SD2 - with complementary I/O -
ON - Primary chassis
OFF - Complementary chassis
Always ON
Maximum I/O Rack Distance
ON - 10,000 cable ft. max. (57.6K baud)
OFF - 5,000 cable ft. max. (115.2K baud)
Always OFF
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
SD - always OFF
SD2 - without complementary I/O - always OFF
SD2 - with complementary I/O -
ON - Primary chassis
OFF - Complementary chassis
10819-I
Table B.A
I/O Rack Selection for PLC-2 Family Processors
I/O Rack
Number
1
2
3
4
5
6
7
Switch Selections
4 5 6
On
On
On
On
Off
Off
Off
On
On
Off
Off
On
On
Off
On
Off
On
Off
On
Off
On
First I/O Group
Number
0
2
4
6
Switch Selections
7 8
On
On
Off
Off
On
Off
On
Off
Allen-Bradley PLCs
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.5
Module Switch Assembly Settings for 1771-ASB series C Adapter for
PLC2 Family Processors
O
F
F
Address Switch Assembly
(S1)
1 2 3 4 5 6 7 8
First I/O group number
(Table 2.C)
I/O rack number
(Table 2.C)
SD always ON
SD2 without complementary I/O
always ON
SD2 with complementary I/O
ON Primary chassis
OFF Complementary chassis
Always ON
Switch Position
1 2
ON OFF
OFF OFF
ON ON
OFF ON
Maximum I/O chassis distance
57.6K Baud 10,000ft
115.2K Baud 5,000ft
Not Used
Not Used
Switch Assembly
(S2)
5 6
O
N
O
F
F
1 2 3 4
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Off
Link Response ON for series B emulation
OFF for unrestricted
ATTENTION: Link response switch must be ON when using the following scanner modules:
1772SD2
Scan on for all but last 4 slots off for all slots
SD always OFF
SD2 without complementary I/O always OFF
SD2 with complementary I/O
ON Primary chassis
OFF Complementary chassis 10798I
Table B.B
I/O Rack Number and First I/O Group Switch Selections for the Address
Switch Assembly S1 (PLC2 Family Processors)
I/O Rack
Number
3
4
5
6
1
2
7
Switch Selections
4 5 6
On
On
On
On
Off
Off
Off
On
On
Off
Off
On
On
Off
On
Off
On
Off
On
Off
On
First I/O Group
Number
4
6
0
2
Switch Selections
7 8
On
On
Off
Off
On
Off
On
Off
B-5
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.6
Module Switch Assembly Settings for 1771-AS and 1771-ASB series A and B Adapters for PLC-3 Family Processors
O
F
F
Address Switch Assembly
(SW-1)
1 2 3 4 5 6 7 8
First I/O group number
(Table B.C)
I/O rack number
(Table B.C)
Switch Assembly
(SW-2)
O
N
O
F
F
1 2 3 4
Always OFF
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
10820-I
Maximum I/O Rack Distance
ON - 10,000 cable ft. max. (57.6K baud)
OFF - 5,000 cable ft. max. (115.2K baud)
B-6
I/O Rack
Number
06
07
10
11
02
03
04
05
00
01
14
15
12
13
16
17
Table B.C
I/O Rack Selection for PLC-3 Family Processors
Switch Setting
1 2 3 4 5 6
On On On On On On
On On On On On Off
On On On On Off On
On On On On Off Off
On On On Off On On
On On On Off On Off
On On On Off Off On
On On On Off Off Off
On On Off On On On
On On Off On On Off
On On Off On Off On
On On Off On Off Off
On On Off Off On On
On On Off Off On Off
On On Off Off Off On
On On Off Off Off Off
I/O Rack
Number
30
31
26
27
22
23
24
25
20
21
34
35
32
33
36
37
Switch Setting
1 2 3 4 5 6
On Off On On On On
On Off On On On Off
On Off On On Off On
On Off On On Off Off
On Off On Off On On
On Off On Off On Off
On Off On Off Off On
On Off On Off Off Off
On Off Off On On On
On Off Off On On Off
On Off Off On Off On
On Off Off On Off Off
On Off Off Off On On
On Off Off Off On Off
On Off Off Off Off On
On Off Off Off Off Off
1st I/O
Group
Number
0
2
4
6
Allen-Bradley PLCs
Switch
Selections
7 8
On
On
On
Off
Off
Off
On
Off
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.7
Module Switch Assembly Settings for 1771-ASB series C Adapters for
PLC3 Family Processors
Address Switch Assembly
(S1)
O
F
F
O
N
1 2 3 4 5 6 7 8
I/O rack number
(Table 2.D)
First I/O group number
(Table 2.D)
Switch Assembly (S2)
O
N
O
F
F
1 2 3 4 5 6
Switch Position
1 2
ON OFF
OFF OFF
OFF
Maximum I/O chassis distance
57.6K Baud 10,000ft
115.2K Baud 5,000ft
ON 230.4K Baud 2,500ft
ON ON Not Used
1
1 230.4K Baud with 1775S5 revision A/G, and
1775SR5 revision A/G scanners only.
Always OFF
Scan On for all but last 4 slots
Off for all slots
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Off
Link Response ON for series B emulation
OFF for unrestricted
ATTENTION: Link response switch must be ON when using the following scanner modules:
1775S4A
1775S4B
1775S5
1775SR5
1775SR
10799I
Table B.D
I/O Rack Switch Selections for the Address Switch Assembly
(PLC3 Family Processors)
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
00 On On On On On On 20 On Off On On On On 40 Off On On On On On 60 Off Off On On On On
01 On On On On On Off 21 On Off On On On Off 41 Off On On On On Off 61 Off Off On On On Off
02 On On On On Off On 22 On Off On On Off On 42 Off On On On Off On 62 Off Off On On Off On
03 On On On On Off Off 23 On Off On On Off Off 43 Off On On On Off Off 63 Off Off On On Off Off
04 On On On Off On On 24 On Off On Off On On 44 Of On On Off On On 64 Off Off On Off On On
05 On On On Off On Off 25 On Off On Off On Off 45 Off On On Off On Off 65 Off Off On Off On Off
06 On On On Off Off On 26 On Off On Off Off On 46 Off On On Off Off On 66 Off Off On Off Off On
07 On On On Off Off Off 27 On Off On Off Off Off 47 Off On On Off Off Off 67 Off Off On Off Off Off
10 On On Off On On On 30 On Off Off On On On 50 Off On Off On On On 70 Off Off Off On On On
11 On On Off On On Off 31 On Off Off On On Off 51 Off On Off On On Off 71 Off Off Off On On Off
12 On On Off On Off On 32 On Off Off On Off On 52 Off On Off On Off On 72 Off Off Off On Off On
13 On On Off On Off Off 33 On Off Off On Off Off 53 Off On Off On Off Off 73 Off Off Off On Off Off
14 On On Off Off On On 34 On Off Off Off On On 54 Off On Off Off On On 74 Off Off Off Off On On
15 On On Off Off On Off 35 On Off Off Off On Off 55 Off On Off Off On Off 75 Off Off Off Off On Off
16 On On Off Off Off On 36 On Off Off Off Off On 56 Off On Off Off Off On 76 Off Off Off Off Off On
Not valid 17 On On Off Off Off Off 37 On Off Off Off Off Off 57 Off On Off Off Off Off 77
1st I/O Group
Number
0
Switch Selections
7 8
On On
Note: Rack address 77 is an illegal configuration.
p
2
4
6
On
Off
Off
Off
On
Off
B-7
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.8
Module Switch Assembly Settings for 1771-AS and 1771-ASB series A and B Adapters for PLC-5 Family Processors without
Complementary I/O
B-8
O
F
F
Address Switch Assembly
(SW-1)
1 2 3 4 5 6 7 8
First I/O group number
(Table B.E)
I/O rack number
(Table B.E)
Maximum I/O Rack Distance
ON - 10,000 cable ft. max. (57.6K baud)
OFF - 5,000 cable ft. max. (115.2K baud)
Switch Assembly
(SW-2)
O
N
O
F
F
1 2 3 4
Always OFF
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
10821-I
Table B.E
I/O Rack Selection for PLC-5 Family without Complementary I/O
I/O Rack
Number
5
6
1
2
3
4 1
1
1
Switch Selections
1 2 3 4 5 6
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
7 1 On On
1 Valid for PLC-5/25 processors only
On
On
On
On
Off
Off
Off
Off
On
Off
Off
On
On
Off
Off
Off
On
Off
On
Off
On
Off
First I/O Group
Number
4
6
0
2
Switch Selections
7 8
On
On
Off
Off
On
Off
On
Off
Allen-Bradley PLCs
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.9
Module Switch Assembly Settings for 1771-ASB series C Adapters for
PLC5 Family Processors Without Complementary I/O
O
N
O
F
F
Address Switch Assembly
(S1)
1 2 3 4 5 6 7 8
First I/O group number
(Table 2.E)
I/O rack number
(Table 2.E)
Switch Position
1 2
Maximum I/O chassis distance (see note)
ON OFF 57.6K Baud 10,000ft
OFF OFF 115.2K Baud 5,000ft
OFF ON 230.4K Baud 2,500ft
ON ON Not Used
Note: PLC5/15 and 5/25 processors operate at 57.6K baud only.
Switch Assembly
(S2)
O
F
F
O
N
1 2 3 4 5 6
Off
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Link Response on for series B emulation off for unrestricted
Scan on for all but last 4 slots off for all slots
Always OFF 10800I
Table B.F
I/O Rack Selection for PLC5 Family Processors without Complementary I/O
Rack
#
Switch Setting
1 2 3 4 5 6
Rack
#
Switch Setting
1 2 3 4 5 6
00 On On On On On On 20 On Off On On On On
01 On On On On On Off 21 On Off On On On Off
02 On On On On Off On 22 On Off On On Off On
03 On On On On Off Off 23 On Off On On Off Off
04 On On On Off On On 24 On Off On Off On On
05 On On On Off On Off 25 On Off On Off On Off
06 On On On Off Off On 26 On Off On Off Off On
07 On On On Off Off Off 27 On Off On Off Off Off
10 On On Off On On On 30 On Off Off On On On
11 On On Off On On Off 31 On Off Off On On Off
12 On On Off On Off On 32 On Off Off On Off On
13 On On Off On Off Off 33 On Off Off On Off Off
14 On On Off Off On On 34 On Off Off Off On On
15 On On Off Off On Off 35 On Off Off Off On Off
16 On On Off Off Off On 36 On Off Off Off Off On
17 On On Off Off Off Off 37 On Off Off Off Off Off
PLC5/11 processors can scan rack 03.
PLC5/15 and PLC5/20 processors can scan racks 0103.
PLC5/25 and PLC5/30 processors can scan racks 0107.
PLC5/40 and PLC5/40L processors can scan racks 0117.
PLC5/60 and PLC5/60L processors can scan racks 0127.
PLC5/250 processors can scan racks 037.
1st I/O
Group
Number
0
2
4
6
Switch
Selections
7 8
On
On
On
Off
Off
Off
On
Off
B-9
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.10
Module Switch Assembly Settings for 1771-AS, -ASB series A and B
Adapters for PLC-5 Family Processors with Complementary I/O
O
F
F
Address Switch Assembly
(SW-1)
1 2 3 4 5 6 7 8
Switch Assembly
(SW-2)
First I/O group number
(Table B.G)
I/O rack number
(Table B.G)
ON - Primary chassis
OFF - Complementary chassis
Maximum I/O Rack Distance
ON - 10,000 cable ft. max. (57.6K baud)
OFF - 5,000 cable ft. max. (115.2K baud)
Always ON
O
N
O
F
F
1 2 3 4
Always OFF
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
ON - Primary chassis
OFF - Complementary chassis
10822-I
Table B.G
I/O Rack Selection for PLC-5 Family with Complementary I/O
I/O Rack
Number
Switch Selections
4 5 6
1
2
On
On
On
Off
Off
On
3
4 1
5
6
1
1
On
Off
Off
Off
Off
On
On
Off
Off
On
Off
On
7 1 Off Off
1 Valid for PLC-5/25 processors only
Off
First I/O Group
Number
4
6
0
2
Switch Selections
7 8
On
On
Off
Off
On
Off
On
Off
B-10
Allen-Bradley PLCs
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Figure B.11
Module Switch Assembly Settings for 1771-ASB series C Adapters for
PLC5 Family Processors With Complementary I/O
Address Switch Assembly
(S1)
O
F
F
O
N
1 2 3 4 5 6 7 8
First I/O group number
(Table 2.F)
I/O rack number
(Table 2.F)
ON Primary chassis
OFF Complementary chassis
Always ON
Switch Position
1 2
Maximum I/O chassis distance (see note)
ON OFF 57.6K Baud 10,000ft
OFF OFF 115.2K Baud 5,000ft
OFF ON 230.4K Baud 2,500ft
ON ON Not Used
Note: PLC5/15 and 5/25 processors operate at 57.6K baud only.
Switch Assembly
(S2)
O
N
O
F
F
1 2 3 4 5 6
Off
Pressed in at top
Closed (ON)
Pressed in at bottom
Open (OFF)
Link Response on for series B emulation off for unrestricted
Scan on for all but last 4 slots off for all slots
ON Primary chassis
OFF Complementary chassis
10801I
Table B.H
I/O Rack Selection for PLC5 Family Processors with Complementary I/O
I/O
Rack #
01
02
03
Switch
1 2 3 4 5 6
On On On On On Off
On On On On Off On
On On On On Off Off
04
05
On On On Off On On
On On On Off On Off
06
07
On On On Off Off On
On On On Off Off Off
See note below
Note: PLC5/11 can scan rack 03.
PLC5/20, PLC5/30, PLC5/40, PLC5/60 can scan racks 0107.
1st I/O Group
Number
4
6
0
2
Switch Selections
7 8
On
On
Off
Off
On
Off
On
Off
B-11
Appendix B
Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Last State Switch -
When ON, outputs of this chassis remain in last state.
When OFF, outputs of this I/O chassis are deenergized when a fault is detected.
Figure B.12
I/O Chassis Backplane Switch Assembly Settings for 1771-AS Remote
Adapter Module in PLC-2 Family Processor System
O
N
O
F
F
1 2 3 4 5 6 7 8
Always OFF
Caution: Set switch 1 to the OFF position to deenergize outputs wired to this chassis when a fault is detected. If switch 1 is set to the ON position, outputs connected to this chassis remain in their last state when a fault occurs and machine motion may continue after fault detection.
Processor Restart Lockout -
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at the chassis.
Addressing Switch -
ON - 1-slot addressing selected
OFF - 2-slot addressing selected
Last Chassis Switch -
ON - Chassis does not contain the highest numbered I/O group for the associated rack number
OFF - Chassis does contain the highest numbered
I/O group for the associated rack number
If you have only a primary chassis, set this switch to OFF.
If you have both primary and complementary chassis, set the primary chassis to ON and the complementary chassis to OFF.
10823-I
Last State Switch -
When ON , outputs of this chassis remain in last state.
When OFF , outputs of this I/O chassis are deenergized when a fault is detected.
Figure B.13
I/O Chassis Backplane Switch Assembly Settings for 1771-AS Remote
Adapter Module in PLC-3 Family Processor System
O
N
O
F
F
1 2 3 4 5 6 7 8
Always OFF
Caution: Set switch 1 to the OFF position to deenergize outputs wired to this chassis when a fault is detected. If switch 1 is set to the ON position, outputs connected to this chassis remain in their last state when a fault occurs and machine motion may continue after fault detection.
Processor Restart Lockout -
When ON , processor can restart I/O chassis
When OF F, I/O chassis must be restarted at the chassis.
1771-A1/A1B chassis in PLC-3 Backup
ON - If any 1771-A1/A1B chassis contains starting I/O group 0 with 2-slot addressing and the PLC-3 is configured in backup mode.
OFF - All other times.
10824-I
B-12
Allen-Bradley PLCs
Index
A addressing
1-slot, 313 with 32-point modules, 314
1/2-slot, 319
2-slot, 33 complementary I/O, 39 using 16-point modules, 35 with 8-point modules, 34
I/O groups, 32 mixing 1 and 2-slot, 323 addressing hardware, 31 assigning I/O rack numbers, with 1/2-slot addressing, 320 audience, P1
B backplane switch assembly description, 29 settings for PLC-3 processor, 29 ,
210 , B1 , B12 settings for PLC-5/15 in remote configuration, 211 settings for PLC-5/15 processor, 210 settings for PLC-5/250 processor, 211 settings with PLC-2 processor, B1 ,
B12
C chassis combinations, acceptable, 324 combinations, I/O chassis and adapter,
325 compatible hardware, P3 complementary I/O, with 1/2-slot addressing, 322 components, hardware, 12 configuration plug, I/O chassis power supply, 212 configuration plugs, 22
D diagnostic indicators, 12
F features of module, 11 field wiring arm, 13 connections, 212
I
I/O groups identifying, 37 identifying with 1-slot addressing, 315
I/O rack number assignment, with 1-slot addressing, 317 indicators, 41 installing the module, 215
K keying, 21
M module placement
1-slot addressing, 316
2-slot addressing, 311
P power requirements, 21
S series B emulation, 11 specifications, A1 switch assemblies, 13 setting, 23 switch assembly S1, 23 use to select, 23 switch assembly S2, 23 use to select, 23 switch locations, 13 switch settings
PLC-2, 25
I–2 Index
PLC-2 with AS, ASB Series A and B adapter, B4
PLC-2 with Series C adapter, B5
PLC-3, 26
PLC-3 with -AS and -ASB Series A and
B, B6
PLC-3 with -AS, Series A or B adapter,
B8
PLC-3 with Series C adapter, B7
PLC-5 with -AS or -ASB Series A, B, with complementary I/O, B10
PLC-5 with complementary I/O, 28 ,
B11
PLC-5 with Series C, without complementary I/O, B9
PLC-5 without complementary I/O, 27
T terminating resistor, 214 terminology, P2 troubleshooting guide, 42 troubleshooting indicators, 41
V vampire mode, 23
Allen-Bradley PLCs
AllenBradley has been helping its customers improve productivity and quality for 90 years.
AB designs, manufactures and supports a broad range of control and automation products worldwide. They include logic processors, power and motion control devices, manmachine interfaces and sensors. AllenBradley is a subsidiary of Rockwell International, one of the world's leading technology companies.
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Publication 1771-6.5.83 - July 1994
Supersedes publication 1771-6.5.83 - January 1992, 17716.5.83-RN1 - May 1992 and 17716.5.83-RN2 - July 1993
P/N 955115-82
Copyright 1994 Allen-Bradley Co. Inc. Printed in USA

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