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It depents if you want to use redundant communication unit CI854A and BC810 which only works with the A version and you should not mix them in a redundant setup.
yes, why not..... it totally depends on your application. But one thing to keep in mind that, PM 861 A only supports redundancy, PM 861 not.
I have not heard of CI851A, so others can comment on it. But there is no restriction of using PM861 with CI851 and CI854A. You have to take a note that, CI851 has moved to classic (or limited) phase, and they are no more supported since SV 5.1.
Yes, agreed with skhpatnaik.....