Rockwell Automation 1785 PLC-5 User Manual Page 24
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Chapter
3
3-1
Installing Your PLC-5 Backup System
This chapter provides an overview of an installed PLC-5 backup system
and describes procedures for installing your PLC-5 backup system
(1785-BCM series B module only). These procedures are:
determining power supply requirements
setting the I/O chassis switches
setting the module switches
installing the 1785-BCM module
connecting the PLC-5 backup system
When installing a backup system for a PLC-5/40, PLC-5/60, or PLC-5/80
processor, you may choose to use a 1785-BEM backup expansion module
to provide backup for the two additional channels of the processor. Refer
to Chapter 4 for installation procedures for the 1785-BEM backup
expansion module.
Figure 3.1 shows a typical configuration of a PLC-5 backup system. In
this system, communication between the controllers is accomplished
through the two 1785-BCM modules. All of the cable connections
between the primary and backup system require a 1770-CD (Belden 9463)
cable.
Important: Do not install I/O modules for controlling your process in
the local chassis. Only the I/O modules residing in the remote chassis will
be backed up. Local chassis are necessary for housing the processor,
1785-BCM backup communication module, 1785-BEM backup expansion
module, and power supply for the backup system. Local I/O is not
backed up.
When a coprocessor is in the same chassis (standalone mode) or directly
connected to a PLC-5 processor (direct-connect mode), place the
1785-BCM and 1785-BEM modules in any other available I/O module
group in that chassis
Important: Do not place the 1785-BCM module in the same module
group (as defined by 2-slot addressing) as the coprocessor. The
1785-BCM module can reside in an adjacent slot, but not in the same
module group (under the same chassis locking tab).
Chapter Objectives
PLC-5 Backup System
Installation Overview
- PLC-5 Backup 1
- Communication 1
- Allen-Bradley 1
- Important User Information 2
- Summary of Changes 3
- Using This Manual 4
- Processor Reference 5
- Related Publications 6
- Table of Contents 7
- Using a Series A 1785-BCM 9
- Chapter 10
- Chapter Objectives 10
- Why Use a Backup System? 10
- Chapter 1 12
- What to do Next 16
- Understanding the 1785-BCM 17
- Hardware Components 17
- Chapter 2 18
- Wiring Arm 18
- Communication Links 18
- Customer Relay 21
- Assemblies 22
- I/O Backplane Interface 23
- What to Do Next 23
- PLC-5 Backup System 24
- Installation Overview 24
- Chapter 3 25
- Determining Power Supply 26
- Requirements 26
- Recommended 27
- Installing the 1785-BCM 28
- Keying Your I/O Chassis 29
- Connecting Your PLC-5 33
- Backup System 33
- Making Remote I/O Connections 36
- Chapter 4 45
- Status Indicators 45
- Installing 50
- the 1785-BEM 50
- Keying the I/O Chassis 52
- Connecting 55
- 1785-BEM Module 55
- Making Channel 2A Connections 57
- Making Channel 2B Connections 60
- How the 1785-BCM Module 65
- Operates 65
- Chapter 5 66
- How the Backup System 77
- Primary (Transmitter) Program 78
- Secondary (Receiver) Program 79
- Starting the Backup System 82
- Editing or Programming 85
- Switchover Considerations 86
- Chapter 6 87
- Input Signal Update Time 87
- Time-out on Remote I/O Link 87
- Data Table Transfer Time 87
- Divergence 88
- Data Highway Plus Switching 89
- Programming 91
- Data Table Considerations 94
- Data Integrity 95
- Switchover Diagnostics 96
- Transfer Data Table Values 100
- Programming Techniques 100
- Chapter 7 100
- Programming Methods to 100
- Counter Instructions 107
- Block Transfer Instructions 109
- Message Instructions 109
- PID Control Files 109
- Summary of Programming 110
- Considerations 110
- Diagnosing Faults 111
- Chapter 8 112
- Specifications 118
- Sample Programs 119
- Appendix A 120
- Program File Organization 120
- Reference Information 148
- Appendix B 149
- Determining Data T 152
- Transfer Time 152
- General Considerations 153
- 1785-BCM 154
- Series A Backup 154
- Module Characteristics 154
- Appendix C 155
- With major offices worldwide 161
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