An expansion module used with a 1785-BCM Series B backup control module to switch two additional configurable communication channels in selected PLC-5 backup architectures.
Product-specific comparisons, advantages and installation checkpoints
Q1
What does the 1785-BEM add to a backup system?
It adds switching for two configurable communication channels beyond the pair handled by the companion backup control module.
Q2
Is the 1785-BEM a replacement for the 1785-BCM?
No. It operates with a 1785-BCM Series B and cannot establish the backup arrangement by itself.
Q3
Which PLC-5 processors are associated with this expansion?
The module is used in PLC-5/40, PLC-5/60 and PLC-5/80 backup configurations built around the matching backup hardware.
Q4
What network functions can the added channels serve?
The channel interfaces support Data Highway Plus and Remote I/O roles according to the installed backup configuration.
Q5
Why must chassis placement be checked carefully?
Backup behavior depends on matched primary and secondary hardware, backplane position, cabling, switch settings and channel assignments.
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