1785BCMC Allen Bradley Communication Module

The Allen-Bradley 1785-BCMC is a specialized Backup Communication Module engineered to provide critical redundancy for legacy PLC-5 Programmable Logic Controller systems. Its fundamental purpose is to significantly enhance system availability by ensuring uninterrupted communication pathways for essential Data Highway Plus (DH+) and Remote I/O (RIO) networks.

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What is the Allen-Bradley 1785-BCMC?

The Allen-Bradley 1785-BCMC is a Backup Communication Module specifically designed for use with PLC-5 Programmable Logic Controllers.

What is the primary function of the 1785-BCMC?

Its main function is to facilitate redundancy for communication paths, particularly Data Highway Plus (DH+) and Remote I/O (RIO) links, between a primary PLC-5 processor and a standby (backup) PLC-5 processor.

How does the 1785-BCMC enhance system reliability?

The 1785-BCMC enhances reliability by providing a dedicated, high-speed backup communication pathway. 

As an integral part of the backup system, the 1785-BCM modules enable high speed communication between the two PLC-5 processors, and permit the secondary processor to assume control of the process.  In addition, the 1785-BCM module provides:

high speed transfer of the data table values from the primary to the secondary system, to ensure that the secondary system's data table is a copy of the primary system's.

a buffer of 4K words for data table values.

exchange of information on the status of the primary and secondary systems.

automatic transfer to the secondary system of the remote input and block transfer read values (analog values, etc.).