Rockwell Automation 1785-BCM_BEM, D17856.5.4 PLC-5 Backup Communication Module User Manual - Manual (Page 18)

Understanding the 1785-BCM
Hardware Components
Chapter 2
2-2
All indicators light at power up or when a hardware fault occurs in the
1785-BCM module. With the exception of the FLT indicator, all of the
1785-BCM module’s indicators are related to individual bits of the system
status word. For more information on the system status word, refer to
Chapter 5, “Operating Your PLC-5 Backup System.”
For information about locating faults using the status indicators, refer to
Chapter 8, “Diagnosing Faults”.
You make connections to your communication links with the 1771-WG
wiring arm, which is shipped with the module.
Your wiring arm attaches to the pivot bar on the bottom of the I/O chassis.
It pivots upward and connects with the module so you can install or
remove the module without disconnecting the wires.
The 1785-BCM module has ports for three communication links for
connection with the Remote I/O, Data Highway Plus network, and the
other 1785-BCM module (Figure 2.2). In addition, the module has a relay
for customer connection.
As shown in Figure 2.2, there are two user-configurable ports (Channels
1A and 1B) that support remote I/O or Data Highway Plus modes.
Table 2.A lists the communication ports and describes how the system uses
each one.
Wiring Arm
Communication Links