When, i turn off my Primary server, in secondary server all services are coming into service other than PLC service(We use PLC connect) due to which Values are not getting updated in HMI. PLC service of secondary server stays in 'synchronising' state for long time when my Primary server is off..
How to overcome this problem?
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The "PLC Service" is the process that actually makes the connection to the 3rd Party OPC server. So you need to ensure that the OPC server is actually serving data to the redundant PLC connectivity service. If this connection fails for some reason, then the PLC service cannot start.
Was the redundant PLC service in "service" state before you shut off the primary server ?
If you leave the primary server off and boot the redundant service is it able to connect to the 3rd party OPC server ?
Have you proven that both servers are capable of getting data at the same time from the 3rd party OPC server.