Rockwell Automation 1785 PLC-5 User Manual Page 52
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Installing Your 1785-BEM Module
Chapter 4
4-9
Electrostatic Discharge Damage
ATTENTION: Under some conditions, electrostatic discharge
can degrade performance or damage the module. Observe the
following precautions to guard against electrostatic damage.
Wear an approved grounded wrist strap or touch a grounded object to
discharge potential before handling the module.
Do not touch the backplane connector or connector pins.
If you configure or replace internal components, do not touch other
circuit components inside the module. If available, use a static-free
work station.
When not in use, keep the module in a static-shielded bag.
Keying the I/O Chassis
Use the plastic keying bands, shipped with each I/O chassis, to key the
chassis slot to accept only the 1785-BEM module.
The module circuit board is slotted in two places on the rear edge. The
position of the keying bands on the backplane connector must correspond
to these slots to allow insertion of the module. You can key any connector
in an I/O chassis to receive this module except for the left-most connector
which is reserved for processor modules. Place keying bands between the
following numbers that are labeled on the backplane connector
(Figure 4.5).
Figure 4.5
Keying
Positions
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
Keying bands
11680I
- 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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