AC800M Communication Protocol MMS failure during Warm Restart
I Have a number of AC800M hi integrity Controllers , MMS used as communication protocole between them carrying very important signals , When I made warm restart on any controller of them , MMS communication failures detected ,
is that normal with MMS communication , specially that I have set logic to take process to safe state if there is a communication failur ??
I hope system version is below 5.1,
It's a normal behavior that when you restart (warm/cold) source controller, IP will not resolve in destination controller so destination controller triggers d system events as u said,
Always use d MMS for monitoring signals only and for critical signals always use d hardwired path since it may occupy ur control network bandwidth n causing more system load so even a warm download for ex low end controllers pm861A causing to shoot the controller load.