Add an option/feature in the Transaction Groups Action Tab and Group Tag Alerting Setup that will use the OPC server’s timestamp instead of the database timestamp.
I’m currently working a project that uses the DNP3.0 communications protocol that supports Unsolicited Report By Exception Messaging (URBE). Using URBE allows me to setup the slave devices to only send data with a timestamp to the master when there’s a change that exceeds the deadband limit inside the slave. The slave devices are also setup to store data with timestamps in the event of a comms lost to the OPC Server. The OPC server never polls the slave for data and it uses the DNP timestamp instead of the server’s timestamp.
Currently I have to add a second item with each tag to get the correct timestamp and have no way to use the OPC timestamp with Tag Alert Function.