Rockwell Automation 1785-BCM_BEM, D17856.5.4 PLC-5 Backup Communication Module User Manual - Manual (Page 17)

Chapter
2
2-1
Understanding the 1785-BCM
Hardware Components
This chapter describes the major components that make up the 1785-BCM
module. These components include:
status indicators
1771-WG wiring arm
1785-BCM communication links
- high-speed serial link (HSSL)
- Data Highway Plus link (DH+)
- remote I/O link (RIO)
customer relay (contact)
switch
assemblies
backplane interface
Refer to Chapter 4 for information about the 1785-BEM backup expansion
module.
The 1785-BCM module has five status indicators on the front panel of the
module (Figure 2.1). The indicators show both normal operation and error
conditions of your PLC-5 backup system.
Figure 2.1
1785-BCM Module Status Indicators
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Primary
Secondary
Backplane
Serial Communication Link (HSSL)
Fault
Chapter Objectives
Status Indicators