Rockwell Automation 1785 PLC-5 User Manual Page 27
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Installing Your PLC-5 Backup System
Chapter 3
3-4
The I/O chassis switch assembly is located on the left side of the chassis
backplane. Table 3.B lists the settings we recommend for the local chassis
of your PLC-5 backup system. (Local refers to the chassis with the PLC-5
processor and the 1785-BCM module.) You can set remote system
switches for your specific application. For more information about setting
your I/O chassis backplane switches refer to the Enhanced and Ethernet
PLC-5 Programmable Controllers User Manual (publication 1785-6.5.12).
Important: The addressing mode and local chassis size you select can
affect the number of remote racks available. Refer to the Enhanced and
Ethernet PLC-5 Programmable Controllers User Manual (publication
1785-6.5.12) for the maximum number of remote racks that can be
addressed by the PLC-5 processor(s) in your system.
T
able 3.B
Recommended
I/O Chassis Switch Settings for Local Chassis
Set switch(es) To this position:
1 OFF – to turn off outputs in the chassis when a fault is detected.
2 and 3 both OFF – these switches are not used
4 and 5 4 – ON configure for 1/2-slot addressing*
5 – OFF configure for 1/2-slot addressing*
6 and 7 as required for your application
8 as required for your application
Important:
*
The
1785-BCM module appears to the PLC-5 processor as a 32-point input module. Y
ou must configure
switches 4 and 5 for 1/2-slot addressing or 1-slot addressing. If not configured as 1/2- or 1-slot addressing, a PLC-5
processor fault will occur
. If you are installing a 1785-BEM module, you must select 1/2-slot addressing.
If your processor is an end device on the Data Highway Plus or remote I/O
link, a terminator must be connected to the processor. In the PLC-5
backup system, you should set each PLC-5 processor in the backup system
as if the other PLC-5 processor does not exist and no 1785-BCM modules
are present. Terminate both links (DH+ and remote I/O):
for a PLC-5/15 or PLC-5/25 processor using switch assembly SW3 on
the PLC-5 processor. See Table 3.C.
for a PLC-5/11, -5/20, -5/30, -5/40, -5/60, or -5/80 processor by
installing an external resistor on the PLC-5 processor. See Table 3.D.
Setting the I/O Chassis
Switches
Terminating the Data Highway
Plus and Remote I/O Links
- 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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