800xA 5.1 MMS Communication failure
Communication variables are not working properly in 800xA 5.1 RevD FP4 RU2. The status of the communication variables are 16#20000. What could be the reason?
It is happening only in some controllers on the same network.
I have attachecd the clock synchronisation status.
Please suggest a solution
Voted best answer
There is a "Product Bulletin" with issue number
which i believe describes your case, only solution is to restart (reset) the controller to get the communication working again.
AC 800M Controller Firmware, Version 5.1.0-x, 5.1.1-1 to 5.1.1-3 and 6.0.0-0, IAC
Communication might be Disturbed after Cold or Init Application Download to IAC Client