The A-B 1785-BCM, also known as the PLC-5 Backup Communication Module, was a device used in Allen-Bradley PLC-5 programmable logic controllers.

• High-speed communication: It enabled fast data transfer between two PLC-5 processors.
• System backup: In case of a failure in the primary processor or other equipment, the 1785-BCM would automatically switch communication to a secondary processor, ensuring minimal disruption.

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