Interfacing SCADA with a Tank Gauging System

Hadn't been given more details of particular SCADA software you're using, can only guess there's no any communication problems between OPC-server and OPC-client just only wrong data representing. I'd suggest you (if wrong readings match to correct ones linearly) to create new tag/alias where you could simply implement correcting calculations.

What is sampling rate for your gauge or its bandwidth? In case if this one doesn't match OPC-client's reading requests it'd cause unpredictable results. Can you create a tag where you get information as shown only after calculating the mean(average value) of ten or so readings?

I'm not in scada for a quite long since I studied and worked on with Genesis and TraceMode. Hope someone better experienced here will provide you more valuable suggestions to sort your problems out.

regards, caramba

Vincent,

From the limited amount of information given in your post it would appear that you have a scaling factor problem. This has nothing to do with the communication (unless of course you are getting loss of data etc).

Are the raw values from the sensors sent to the SCADA system directly over some bus system and then calculations performed or is their an intermediate system (PLC for example).

If you could provide some more specific details then I am sure someone here will be able to assist.

Kind Regards

Mr. W.A Snow