Rockwell Automation 57C423 User Manual
Common
Memory Module
(M/N 57C413B)
(M/N 57C423)
Instruction Manual JĆ3636Ć2
The information in this user's manual is subject to change without notice.
DANGER
ONLY QUALIFIED ELECTRICAL PERSONNEL FAMILIAR WITH THE
CONSTRUCTION AND OPERATION OF THIS EQUIPMENT AND THE HAZARDS
INVOLVED SHOULD INSTALL, ADJUST, OPERATE, AND/OR SERVICE THIS
EQUIPMENT. READ AND UNDERSTAND THIS MANUAL IN ITS ENTIRETY
BEFORE PROCEEDING. FAILURE TO OBSERVE THIS PRECAUTION COULD
RESULT IN SEVERE BODILY INJURY OR LOSS OF LIFE.
WARNING
INSERTING OR REMOVING A MODULEMAY RESULT IN UNEXPECTED MACHINE
MOTION. POWER TO THE MACHINE SHOULD BE TURNED OFF BEFORE
INSERTING OR REMOVING THE MODULE. FAILURE TO OBSERVE THESE
PRECAUTIONS COULD RESULT IN BODILY INJURY.
WARNING
THIS MODULE CONTAINS STATICĆSENSITIVE COMPONENTS. DO NOT TOUCH
THE CONNECTORS ON THE BACK OF THE MODULE. WHEN NOT IN USE, THE
MODULE SHOULD BE STORED IN AN ANTIĆSTATIC BAG. THE PLASTIC COVER
SHOULD NOT BE REMOVED. FAILURE TO OBSERVE THIS PRECAUTION COULD
RESULT IN DAMAGE TO OR DESTRUCTION OF THE EQUIPMENT.
ReSourcet and AutoMaxt are trademarks of Reliance Electric Company or its
subsidiaries.
Reliancer is a registered trademark of Reliance Electric Company or its subsidiaries.
Table of Contents
1.0 Introduction 1Ć1...............................................
2.0 Mechanical/Electrical Description 2Ć1...........................
2.1 Mechanical Description 2Ć1...................................
2.1.1 Checking the Status of the OnĆBoard Battery 2Ć1..........
2.2 Electrical Description 2Ć3.....................................
3.0 Installation 3Ć1................................................
3.1 Initial Installation 3Ć1.........................................
3.2 Module Replacement 3Ć2.....................................
3.3 OnĆBoard Battery Replacement 3Ć3............................
4.0 Programming 4Ć1..............................................
4.1 Configuration 4Ć1...........................................
4.1.1 Variable Control and Access 4Ć1.........................
4.1.2 Variable Storage 4Ć2...................................
4.1.3 Configuration Method 4Ć2..............................
4.2 Restrictions 4Ć2.............................................
4.2.1 Rack Slot Restrictions 4Ć3..............................
4.2.2 Remote Racks 4Ć3.....................................
5.0 Diagnostics and Troubleshooting 5Ć1............................
5.1 The SYSTEM WATCHDOG" LED is Off 5Ć1.....................
5.2 The BAT.OK" LED is Off 5Ć1..................................
5.3 Incorrect Data 5Ć1...........................................
5.4 Bus Error 5Ć2...............................................
I
Appendices
Appendix A
Technical Specifications AĆ1......................................
Appendix B
Module Block Diagram BĆ1......................................
Appendix C
Configuring the Common Memory Module in DCS 5000 or
AutoMax V 2.1 or Earlier Systems CĆ1.............................
Appendix D
Summary of Common Memory Module Features DĆ1................
Appendix E
How Removing/Replacing the Common Memory Module
Affects Tasks and Variables in a DCS 5000 Rack EĆ1................
Appendix F
How Removing/Replacing the Common Memory Module
Affects Tasks and Variables in an AutoMax Rack FĆ1................
II
List of Figures
Figure 2.1 Ć Module Faceplate 2Ć2.....................................
Figure 3.1 Ć Rack Slot Numbers 3Ć2...................................
III
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1.0 INTRODUCTION
The products described in this instruction manual are manufactured
or distributed by Reliance Electric Industrial Company.
The Common Memory module (57C413B and 57C423) is required in
slot 0 of a DCS 5000/AutoMax rack that contains more than one
Processor module. The Common Memory module stores the
configuration data that must be shared among Processors, such as
definitions of physical I/O. This frees Processor module memory for
application tasks. The Common Memory module also arbitrates the
Processors' access to the bus.
The Common Memory module may also be placed in slot 0 of
a singleĆProcessor rack. As in the case above, the configuration data
which normally resides on the Processor module in a
singleĆProcessor rack is stored on the Common Memory module.
When the Common Memory module is placed in any even slot other
than 0, it is used for userĆdefinable data storage only. This mode is
useful if you need to control explicitly the physical allocation of
memory, e.g., to define consecutive registers for shaft register
instructions. Note, however, that it is not possible to define arrays in
this mode.
The module incorporates bus arbitration logic, a system watchdog
for multiĆprocessing, and batteryĆbacked RAM for data storage.
When used in slot 0, M/N 57C413B has 128K bytes (64K registers) of
memory; M/N 57C423 has 256K bytes (128K registers) of memory.
Both versions of the module make available 128K bytes only when
used in any even slot other than 0. An onĆboard lithium battery and a
superĆcapacitor protect the Common Memory module from power
failures. Note that the battery backup is designed to maintain the
contents of RAM only. It is not a source of uninterruptible power.
Should the rack lose power, the onĆboard battery can maintain the
contents of RAM for a minimum of 600 days.
This manual describes the functions and specifications of the
module. It also includes a detailed overview of installation and
servicing procedures, as well as examples of programming methods.
Unless specifically noted otherwise, the information in this manual
describes both the M/N 57C413B and M/N 57C423 Common
Memory modules.
Related publications that may be of interest:
D JĆ3630 ReSource AutoMax PROGRAMMING
D JĆ3649 AutoMax CONFIGURATION TASK MANUAL
D JĆ3650 AutoMax PROCESSOR MODULE INSTRUCTION
D JĆ3675 AutoMax ENHANCED BASIC LANGUAGE
D JĆ3676 AutoMax CONTROL BLOCK LANGUAGE
D JĆ3677 AutoMax LADDER LOGIC LANGUAGE
EXECUTIVE INSTRUCTION MANUAL
VERSION 1.0
MANUAL
INSTRUCTION MANUAL
INSTRUCTION MANUAL
INSTRUCTION MANUAL
1Ć1
D JĆ3684 ReSource AutoMax PROGRAMMING
D JĆ3750 ReSource AutoMax PROGRAMMING
D IEEE 518 GUIDE FOR THE INSTALLATION OF ELECTRICAL
EXECUTIVE INSTRUCTION MANUAL
VERSION 2.0
EXECUTIVE INSTRUCTION MANUAL
VERSION 3.0
EQUIPMENT TO MINIMIZE ELECTRICAL NOISE
INPUTS TO CONTROLLERS FROM EXTERNAL
SOURCES
1Ć2
2.0 MECHANICAL/ELECTRICAL
DESCRIPTION
The following is a description of the faceplate LEDs and the basic
circuit functions on the module.
2.1 Mechanical Description
The Common Memory module is a printed circuit board assembly
that plugs into the backplane of the DCS 5000/AutoMax rack. The
module consists of a printed circuit board, a faceplate, and a
protective enclosure. The faceplate contains tabs at the top and
bottom to simplify removing the module from the rack. On the back
of the module are two edge connectors that attach to the system
backplane. Module dimensions are listed in Appendix A. See figure
2.1 for module faceplates.
The faceplate contains two green status lights. The upper status light,
labeled BAT.OK", indicates whether the onĆboard battery is
providing sufficient voltage to retain the contents of RAM (ON) or
should be replaced (OFF). See section 3.3 for directions on replacing
the battery and Appendix A for battery specifications. The lower
status light, labeled SYSTEM WATCHDOG", is lit only when the
module is in slot 0, the module has passed its powerĆup
diagnostics, and the bus arbitration clock is present on the
backplane. If the status light is off, it indicates the module is not
operational, either because it is malfunctioning or because it is
located in a slot other than 0 and is providing data storage only.
2.1.1 Checking the Status of the OnĆBoard Battery
The status of the Common Memory module onĆboard battery can be
checked in the following ways:
If the Common Memory module is in slot 0:
D the BAT. OK" LED on the faceplate will be ON to indicate the
battery is providing sufficient voltage to maintain the contents of
RAM memory and OFF if the battery should be replaced.
D the Info/Log Processor Information Display from the ON LINE
menu of the AutoMax Programming Executive will show the
battery status.
If the Common Memory module is not in slot 0 (i.e., it is in any other
evenĆnumbered slot and is being used for data storage only), the
battery status is indicated only by the status of the BAT.OK" LED on
the module faceplate.
2Ć1
COMMON
MEMORY
MODULE
57C413B
COMMON
MEMORY
MODULE
57C423
BAT.OK
BAT.OK
2Ć2
Figure 2.1 Ć Module Faceplate
2.2 Electrical Description
The Common Memory module incorporates the bus arbitration logic
required when there are two or more Processor modules in a rack.
Note that bus arbitration logic is enabled only when the module is in
slot 0. The bus arbitration logic will support up to a maximum of four
Processors located in slots 1Ć4.
The bus arbiter resolves the contention problem that arises when
two or more Processors attempt to access the backplane bus at the
same time. Bus arbitration logic guarantees that every Processor
requesting the bus will be given a turn on the bus before any other
Processor can access it a second time. If two Processors attempt to
use the bus at the same time and neither one has previously
accessed the bus, the Processor module located in the
lowerĆnumbered slot will be permitted to access the bus first.
The superĆcapacitor on the Common Memory module can be
charged to more than 90% of its rated capacity in approximately 8
minutes. It is typically capable of retaining the contents of RAM
memory for approximately 400 minutes should the BAT.OK" light go
out and power is removed from the module. (Removing or replacing
the Common Memory module may affect tasks and variables in the
rack. Appendix E describes the effect on tasks and variables in a
DCS 5000 rack. Appendix F describes the effect on tasks and
variables in an AutoMax rack.)
The module also contains a watchdog timer that is used to detect
Processor failures in a multiĆProcessor system. If a Processor is
unable to reset the watchdog timer, the timer will generate an
interrupt to notify the other Processors in the rack of the failure. A
4.6" will appear on the faceplate of all Processor modules except
the one that timed out. The watchdog timer is enabled only when the
module is in slot 0.
PowerĆup diagnostics for this module are run by a Processor module.
Diagnostics are performed on the RAM memory, control registers,
and watchdog timers.
2Ć3
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