Redundant AC800M installed a long distance
How to join a redundant AC800M, each one CPU separate for about 20 meters? Customer ask to install them for security reasons at two panels with 10 meters distance between them.
If you are using ver6.0 of CCB or 800xA there is support for the new BC820 module, which allows for up to 200m of distance between CPUs. Have tried it, works fine, be careful to use correctly manufactured cables.