Data Transfer to ABB Historian
In our project, we have many remote locations with AC500 PLCs, having limited network access. Network sometimes gets disconnected. That's why data will be logged on PLC with timestamps and will be transferred to 800xA 5.1 server through OPC, after connection gets back online.
Is there a way transfer this data to 800xA OPC-HDA Server with timestamps that indicated as in PLC variables?
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None that I've heard of.
Sonething like following must be implemented:
1. Log is defined in some xA system Historian and logs as much as the OPC server can deliver.
2. Some custom controller application is performing logging of its own down in the PLC.
3. Some custom program in upper layer system is shadowing the subscriptions made by the Historian. If data becomes missing it will detect this and as soon data becomes available again connect with the app in step 2, collect missing points and insert/modify them via OPCHDA protocol.
The TTD logging feature available in 800xA for Advant Master connect and associated PLCs would do the job.