Allen-Bradley 1785-BCM/C Backup Communications Module

FAQ

Q1. What is the 1785-BCM/C used for?
It is used in PLC-5 systems to provide backup and redundancy for communications, enabling automatic switchover between primary and standby processors.

Q2. Is it a PLC processor?
No, it is a support module, not a CPU. It only handles communication redundancy.

Q3. What networks does it support?
It supports Data Highway Plus (DH+), Remote I/O (RIO), and High-Speed Serial Link (HSSL).

Q4. Does it require external power?
No, it is powered directly from the 1771 I/O chassis backplane.

Q5. What is its main role in redundancy systems?
It manages automatic switchover between primary and standby PLC processors in case of fault or failure.

Q6. What is its data speed?
HSSL communication supports up to 1.2 Mbaud.

Q7. Is it still in production?
No, it is a legacy/discontinued PLC-5 family module.

Q8. What is its installation type?
It installs into a single slot in a 1771 I/O chassis using a 1771-WG wiring arm.

1785-BCM/C Allen Bradley

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