By using status information, which is a default OPC functionality, an OPC Client can identify whether an E3 Server is currently with no Domain, is in Standby mode, or is executing normally. Possible values for OPC statuses are the following:

•OPC_STATUS_RUNNING: Domain executing normally

•OPC_STATUS_SUSPENDED: Domain in Standby mode

•OPC_STATUS_NOCONFIG: Domain stopped or no Domain