IAC timeout alarm During OLU
these "IAC Communication Timeout" Alarms will also comes for all the other Controller to which it is communicated (IAC Clients ).
Is it is Normal ?
System Version:ABB800xA 5.1 FP4 Rev-E , AC800M
It seems like controller handover is taking more time than time configured for timeout configuration.
For Online Upgrade when using Safe MMS communication, ensure that the OLUTimeOut parameter is set to 30000ms and that the UseOLUTimeOut parameter is set to true in the MMSRead control modules. This avoids any interruption in connection during the whole Online Upgrade process.
If SIL IAC (using communication variables) is used for communication between applications, the timeout during Online Upgrade is automatically extended to 30000ms or to the configured timeout value if that is longer. This avoids any interruption in connection during the whole Online Upgrade process.