Allen-Bradley 1771-KA2 User manual

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T able of Contents
i
Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About
This Manual 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Organization 1-5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary
1-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Station Hardware 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication Adapter Module 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Processor 2-8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Chassis 2-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power
Supply 2-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cables 2-13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other
Optional Equipment 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary
2-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Installation 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch Settings 3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keying 3-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
In The I/O Slot 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Connections 3-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commands 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protected/Unprotected 4-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Write Commands 4-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bit Write Commands
4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read Command
4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessible
Data T able Locations - PLC-2 Processors 4-7 . . . . . . . . . . . . . . . . . .
Accessible
Data T able Locations - PLC Processors 4-9 . . . . . . . . . . . . . . . . . . .
Accessible Data T able Locations - PLC-3 Processors 4-10 . . . . . . . . . . . . . . . . . .
Accessible
Data T able Locations - PLC-4 Microtrol Processors 4-1 1 . . . . . . . . . . .
Chapter Summary 4-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication Zone Rungs 5-1. . . . . . . . . . . . . . . . . . . . . . . . . .
General 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Header Rungs
5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Access Rungs
5-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Rungs
5-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delimiter
Rung 5-1 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary
5-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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T able of Contents
ii
Status Words 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 6-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START/DONE Word
6-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REMOTE/LOCAL
F AULT Word 6-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error
Code Storage W ord 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 6-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Initiation, Execution, and Monitoring 7-1. . . . . . . . . . .
General 7-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START/DONE
Bit T iming 7-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controlling The Start Bit 7-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REMOTE/LOCAL
F AUL T Bit Monitoring 7-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timeout Preset Value
7-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary
7-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Station Interfacing 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floating Master
8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commands From A Computer 8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary
8-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-up and Troubleshooting 9-1. . . . . . . . . . . . . . . . . . . . . . . . .
General 9-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-up and T roubleshooting Aids 9-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-up Procedures
9-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 9-18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 9-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Design Aids and Documentation 10-1. . . . . . . . . . . . . . . . . . . . . . .
General 10-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Summary
10-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Forms 10-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Maps
10-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Code Listing A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter 1
1–1
Introduction
An Allen-Bradley Data Highway extends the capabilities of
programmable controllers by letting them exchange data with each other
and with other intelligent RS-232-C devices. Data Highway integrates
individual controllers into a larger automated manufacturing network. On
a single Data Highway cable, as many as 64 separate programmable
controllers and computers can be connected over a distance of 10,000
feet (3,048m).
The unit that interfaces PLC-2 family programmable controllers to this
network, and makes communication possible, is an A-B Communication
Adapter Module (cat. no. 1771-KA2). (See Figure 1.1) It is a Data
Highway station interface module and is used with Bulletin 1772
programmable controller processors. These processors are:
PLC-2 Processor (cat. no. 1772-LR)
PLC-2/20 Processor (cat. no. 1772-LP1, -LP2)
PLC-2/30 Processor (cat. no. 1772-LP3)
Figure 1.1
Communication Adapter Module (cat. no. 1771-KA2)
10862-I
Mini-PLC-2 Processor (cat. no. 1772-LN1, -LN2, -LN3)
Mini-PLC-2/05 (cat. no. 1772-LS, LSP)
Description
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Introduction
Chapter 1
1–2
Mini-PLC-2/15 (cat. no. 1772-LV)
This module enables communication of memory data between these
processors, and from any of these processors to other processors on the
Data Highway via communication adapter modules.
A typical Data Highway configuration is shown in Figure 1.2.
Figure 1.2
Representative Data Highway Configuration
10,000 feet (3,048 meters) maximum
Data Highway Cable Trunkline
Cable Droplines
100 feet
(30.5 meters)
maximum
1770-SC
Station
Connector
Communication Controller
Module
(cat. no. 1771-KE/KF)
I/O Rack
Mini-PLC-2,
Mini-PLC-2/05,
or Mini-PLC-2/15
Programmable Con-
troller
Communication Adapter
Module
(cat. no. 1771-KA2) Communication
Adapter Module
(cat. no. 1775-KA)
Mini
Computer
PLC-3
PLC-2 Family
Programmable Controller 12210
The terms “communication adapter module” and “1771-KA2” and
“KA2” are interchanged throughout the manual.
About This Manual
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Introduction
Chapter 1
1–3
This manual describes installation, operation, and programming
necessary to use the KA2 communication adapter module. Use this
manual with the other manuals and publications pertinent to your system.
Table 1.A lists other available Data Highway manuals and Table 1.B lists
PC manuals.
T able 1.A
Data Highway Documentation
Old
Publication
Number
New
Publication
Number Title
1774-819 1774-6.5.8 User’ s Manual, Communication Adapter
Module (cat. no. 1771-KA)
1771-822 1771-6.5.15 User’ s Manual, Communication Controller
Module (cat. no. 1771-KE/KF)
1771-823 1771-6.5.16 User’ s Manual, PROVOX system Interface
Module (cat. no. 1771-KX1)
1773-801 1773-6.5.2 User’ s Manual, PLC-4 Microtrol
Communication Interface Module (cat. no.
1773-KA)
1775-802 1775-6.5.1 User’ s Manual, Communication Adapter
Module (cat. no. 1775-KA)
1771--811 1771-6.5.8 User’ s Manual, PLC-2 Family/RS-232-C
Interface Module (cat. no. 1771-KG)
1770-810 1770-6.2.1 Data Highway Cable Installation Manual
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Introduction
Chapter 1
1–4
T
able 1.B
Manuals for Allen-Bradley Programmable Controllers
Controller Old
Number New Number
Manual TItle
Mini-PLC-2
Program. Cont.
1772-820
1772-821 1772-6.6.3 1772-6.8.4
Assembly and Installation
Programming and Operation
Mini-PLC-2/05 1772-830
1772-831 1772--6.6.6 1772-6.8.6
Assembly and Installation
Programming and Operations
Mini-PLC-2/15
Program. Cont.
1772-803
1772-804 1772-6.6.1 1774-6.8.2
Assembly and Installation
Programming and Operations
PLC-2/20
Program. Cont.
1772-807
1772-802 1772-6.6.2 1772-6.8.1
Assembly and Installation
Programming and Operations
PLC-2/30
Program. Cont.
1772-807
1772-806 1772-6.6.2 1772-6.8.3
Assembly and Installation
Programming and Operations
PLC
Program. Cont.
1774-812
1774-800 1774-6.6.2 1774-6.8.1
Assembly and Installation
Programming and Operations
PLC-3
Program. Cont.
1775-800
1775-801 1775-6.7.1 1775-6.4.1
Installation and Operations
Programming
PLC-4 Microtrol 1773-800 1773-6.5.1 Product Guide
To use this manual, 1772-6.5.1, knowledge of the particular
progammable controller being used in your application is essential.
Because you connect the communication adapter module to an operating
programmable controller, you must have a good understanding of
programmable controller operation, installation, memory structure, and
programming.
Publications are available for each Allen-Bradley programmable
controller. All publications in Table 1.A and Table 1.B are available from
an A-B sales office, or from Allen-Bradley Publications, 6100 Industrial
Court, Greendale, WI 53129.
Features of a 1772-KA2
Here are some of the KA2’s features:
New commands have been added to the 1771-KA2 that simplify
upload and download procedures.
A KA2 lets you to change (remotely) the size of the PC data table.
(New with 1772-KA2 module.)
It has second module or “daisy chain” capability. (New with 1772-KA
2 module.)
Uses ladder diagram instructions for ease of programming.
Offers memory write protection through programming and switch
selection.
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Introduction
Chapter 1
1–5
Controls communication without need for a host computer.
Has automatic error checking of data it receives.
Has self-checking diagnostics.
Shows status and diagnostics with LED indicators and error codes.
Controls DONE and REMOTE/LOCAL FAULT memory bits as status
and diagnostic indicators.
Automatically re-tries messages.
Automatically recovers from master station fault condition.
Has selectable priority levels for commands.
Is compatible with industrial terminal system.
Installs easily.
The chapters in this manual are organized as follows and each chapter
closes with a summary:
Chapter 2 describes the hardware components that make up a Data
Highway station.
Chapter 3 outlines procedures for module installation.
Chapter 4 describes programmed commands and memory access.
Chapter 5 describes programming of the communication zone of
program.
Chapter 6 describes status words that are controlled by the module at
its station processor.
Chapter 7 outlines programming that is necessary to initiate and
monitor command execution.
Chapter 8 describes station interface module interaction along the Data
Highway.
Chapter 9 describes start-up and troubleshooting tools and procedures.
Chapter 10 provides aids to design and documentation of a Data
Highway that uses a communication adapter module.
This chapter discussed:
Features of a 1771-KA2 Communication Adapter Module
How the module fits into an A-B Data Highway system
What a 1771-KA2 does, and the A-B PLC data processor it works with
Publications available for Data Highway and PLC-2 family PCs
In chapter 2 you will learn about a Data Highway station and the KA2’s
role in station function.
Organization
Chapter Summary
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Introduction
Chapter 1
1–6
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Chapter 2
2-1
Station Hardware
The following components make up a Data Highway station with a PLC-2
family PC:
Communication Adapter Module
Processor
PLC-2 I/O adapter module for PLC-2/20 and PLC-2/30 processors
Bulletin 1771 I/O chassis
Power supply
Data Highway/Processor cable
Data Highway cable dropline
Figure 2.1 shows the configuration of a typical Data Highway station for
PLC-2/20 and PLC-2/30 processors. Figure 2.2 shows a typical
configuration for the mini-processor module.
Figure 2.1
Typical Station Configuration--PLC-2/20 and PLC-2/30 Processors
Processor
Station
Data Highway
Cable Trunkline
Station
Dropline
100 feet
maximum
Communication
Adapter
Module
(cat. no. 1771-KA2)
Data Highway
Processor Cable
(cat. no. 1771-CR)
I/O Chassis
12326
General
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Station Hardware
Chapter 2
2-2
Figure 2.2
Typical Station Configuration--Mini-PLC-2, Mini-PLC-2/05, and Mini-PLC-2/15 Controllers
Station
Data Highway Cable
Trunkline
Station
Dropline
Connection for
Programming
Terminal
Communication Adapter
Module (cat. no. 1771-KA)
Data Highway
Processor Cable
(cat. no. 1771-CN.-CO)
System
Power Supply
Mini-Processor Module
(cat. no. 1772-LV, -LS, -LSP;
1772-LN1, -LN2, -LN3)
12327
As these figures illustrate, the term “station” combines both the
communication adapter module and its connected programmable
controller processor. (When specifying only the individual processor or
communication adapter module at a station, the terms “station processor”
or “station communication adapter module” are used.)
The following sections describe the functions and compatibility of each
station hardware component.
A communication adapter module (cat. no. 1772-KA2) provides the
interface between all PLC-2 family PCs and other stations on the Data
Highway. (Refer to Figure 2.3). The module has sockets for cable
Communication Adapter Module
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Station Hardware
Chapter 2
2-3
connection, switches for enabling or disabling specific module operations,
and indicators to aid in monitoring module behavior and in
troubleshooting. Subsequent sections describe each of these parts of the
module and other aspects of module hardware that are significant in its
set-up and installation.
Each communication adapter module in a Data Highway installation must
have a unique station number. This station number is used to address
commands to the module from other stations.
Figure 2.3
Communication Adapter Module (cat. no. 1771-KA2)
(Side view)
Switch Cover
10862-I
Connectors
Indicator
Connectors
The front of a 1772-KA2 module has 3 cable connectors labeled:
DATA HIGHWAY
PROGRAM INTERFACE
PROCESSOR
See Figure 2.4.
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Station Hardware
Chapter 2
2-4
Figure 2.4
Module Connection Summary
Data Highway
Processor Cable
(cat.no. 1771-CN, -CO, -CR)
“Program Panel”
or “Interface”
Socket on
Processor
Data Highway Cable
(User-Assembled)
Program Panel Interconnect Cable
(Cat. no. 1772-TC)
Industrial Terminal System
(cat. no. 1770-T1 and T2)
10863-I
Data Highway Connector
The upper connector of the module accepts the 15-pin Data Highway
dropline cable. Through this connection, a single KA2 module can
communicate with as many as 63 other Data Highway stations.
Module transmitting and receiving circuitry on this channel are
transformer-coupled to the Data Highway link. This design permits
differential transmission of data with high common-mode noise immunity.
Electrically, transformer coupling provides isolation between module
logic circuitry and the Data Highway cable.
Program Interface Connector
The middle outlet on the module connects to an industrial terminal system
(cat. no. 1770-T1, -T3), or to a second KA2, or to a 1771-KG series B
module.
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Station Hardware
Chapter 2
2-5
To connect any programming terminal to the PROGRAM INTERFACE
connector, use a program panel interconnect cable (cat. no. 1772-TC).
With a 1772-KA2 module installed, the PROGRAM INTERFACE
connector substitutes for the PROGRAM PANEL connector on PLC-2/20
or PLC-2/30 processors or the INTERFACE socket on the Mini-PLC-2,
Mini-PLC-2/05, or Mini-PLC-2/15. This means that all interaction
between the processor and the programming terminal is controlled
through the communication adapter module. This interaction includes
program entry and any functions that involve peripheral devices except
cassette loads--including report generation, contact histograms, and
generation of program copies on paper or on punched tape.
The communication rate over this channel is 9600 baud.
Optical-electrical isolation is provided between receiving circuitry on this
channel and module logic circuitry.
NOTE: The PROGRAM INTERFACE connector need not connect to a
programming terminal for the module to operate. This connector serves as
a programming terminal connection whenever such a device is needed for
program entry, editing or monitoring.
Processor Connector
The lower connector of the module connects to the station PLC-2/20 or
PLC-2/30 processor, or Mini-processor module. (Refer to Figure 2.1 and
Figure 2.2) A Data Highway/Processor cable, described in section titled
“Cables,” is used for this connection.
Indicators
There are 5 LED indicators on the front of the module, as seen in
Figure 2.5.
These indicators are useful for monitoring module activity and for
troubleshooting. Three green indicators show module status during
normal receiving and transmitting of messages. Two red indicators show
the status of module diagnostics.
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Station Hardware
Chapter 2
2-6
Figure 2.5
Module Indicators
COMM
ADAPTER
XMTG
RCVG
PROG
PROC
Message Ready
Transmitting
Receiving
Program Status
Processor Link
RDY
Status
XMTG
The green transmitting indicator turns on when the module is current
master of the Data Highway. When this indicator is on, therefore, the
communication adapter module is transmitting messages on the Data
Highway communication link, or it is polling.
RCVG
The receiving indicator turns on when the module is receiving a message
addressed to it. Otherwise, RCVG is off.
When both the RCVG and XMTG indicators are on, the module is current
master of the Data Highway and is polling. (The section titled “Polling,”
in chapter 8, describes polling procedure.)
RDY
The green message ready indicator turns on when the module has
messages ready to transmit. With this indicator on, the module is ready to
assume mastership when it is polled.
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Station Hardware
Chapter 2
2-7
PROG
The red program status indicator tells you the status of module checks on
the communication zone rungs of the user program. (The section titled
“Overall Format,” chapter 5, describes these rungs.) The module first
checks these rungs at power-up. When it locates the header rung of this
zone, the module turns the PROG indicator on. After it checks the rungs,
provided no errors are found, the module turns the PROG indicator OFF.
However, if the module detects any programming error in the
communication zone of the program, this indicator remains ON. In this
event, the module cannot function. You must check the communication
zone of the program and correct any errors. (Start-up procedures are
described in chapter 9.)
PROC
The red processor link status indicator gives the status of error-checking
diagnostics for communication adapter/processor communication. The
PROC indicator is normally off.
Should the 1771-KA2 module detect an error in data transmission with
the processor, it turns the PROC indicator on. This may mean one of the
following:
Disconnection of the Data Highway/Processor cable between the
communication adapter and the processor
Fault in processor operation
Incorrect selection of processor link communication rate on the module
(Refer to section titled “Write Option Switch Assembly,” chapter 3).
The section titled “Module Indicators,” in chapter 9, describes the use of
indicators in troubleshooting.
Switches
There are 3 sets of switches on the 1771-KA2 module circuit board. These
switches are beneath the small switch cover plate on the component-side
cover of the module. (Refer to Figure 2.3).
The programmer selects the settings of these switches for each
communication adapter module, based upon such variables as station
number, command capabilities, and type of station processor. Switch
settings are a part of module installation, described in chapter 3.
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Station Hardware
Chapter 2
2-8
Module Specification Summary
Table 2.A lists operating specifications for a 1771-KA2 module.
T able 2.A
Operating Specifications
Function
•
Interface entire PLC-2 family
programmable controller to the Data
Highway
Compatible Power Supplies
• System power supply (cat. no. 1771-P1)
• Auxiliary power supply (cat. no. 1772-P2)
Location
•
Bulletin 1771 I/O Chassis (any slot
except furthest left)
• System power supply module (cat. no.
1772-P1, series B or later)
Communication Channels
•T o Data Highway
•T o programming terminal or second
module in daisy chain
•T o processor or first module in daisy
chain
• Auxiliary power supply (cat. no. 1772-P2
series B or later)
• Power supply module 1771-P3
• Power supply module 1771-P4
• Power supply module 1771-P5
Communication Rates
•T o Data Highway: 57.6k baud
(Recommended)
•T o programming terminal or second
module: 9.6k buad
•T o processor: 91.2k baud for
processor (except PLC-2, cat. no.
1772-LR); 9.6k baud for first
communication module or PLC-2-
family processor .
Ambient T emperature Rating
•32o to 140
o
F (0
o
to 60
o
C) (operational)
•-40o to 185
o
F (-40
o
- 85
o
C) (storage)
Humidity Rating
• 5% to 95% (without condensation)
Keying
•
Module slotted for I/O chassis keying
band positioning.
• Positions 4-6, 22-24
Power Supply Requirement
• +5V DC at 1.2A (max.)
This manual uses the term “processor” as a general term for any of the
PLC-2 family processors. Individual processors are specified only when
some distinction must be made.
The normal operating sequence of the station processor is not changed by
a communication adapter module, that is, the processor carries out its scan
of input and output modules and execution of the user program as though
the communication adapter module weren’t there.
Processor
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Station Hardware
Chapter 2
2-9
The interaction between a KA2 module and its station processor occurs in
memory control. The station KA2 can read data from and write data into
processor memory, based on various user-programmed commands.
Commands that originate at a station communication adapter module can
control only data table areas of processor memory. Commands generated
by a computer that is connected to the Data Highway through a
communication controller module (cat. no. 1771-KE/KF) can control
both data table and user program memory areas.
Note that the processor continues to execute the user program and to
control output devices, whether or not the station communication adapter
module is in operation. Thus, disconnection of the Data Highway cable or
faulted operation of the communication adapter module does not cause
shutdown of the station processor.
A-B designed the 1771-KA2 module to fit in a Bulletin 1771 I/O chassis
assembly (cat. no. 1771-A1,-A2,-A4). This chassis houses Mini-PLC-2,
Mini-PLC-2/05 and Mini-PLC-2/15 programmable controllers. With one
of these controllers, you can use any unoccupied I/O slot for
communication adapter modules.
With PLC-2/20 and PLC-2/30 programmable controllers, use a Bulletin
1771 I/O chassis as an I/O rack. In this case, the 1771-KA2 module can
be installed in any chassis slot except the one furthest left. This left-most
slot must be occupied by a PLC-2 I/O adapter module (cat. no. 1771-AL
or 1771-AS), shown in Figure 2.6, or a backplane jumper board assembly
(cat. no. 1771-EY).
A Bulletin 1771 I/O chassis is usually mounted within an enclosure. We
recommend proper grounding of this enclosure because it minimizes the
effect of noise from the surrounding industrial environment. (Grounding
procedures for the Bulletin 1771 I/O chassis are described in publication
1772-6.6.3).
I/O Chassis
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