Rockwell Automation 1785 PLC-5 User Manual download pdf (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

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 160 161

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Rockwell Automation 1785 PLC-5 User Manual Page 18