Justification for data historian?
Justification for data historian?
(OP)
What is the justification for a data historian in, or connected through OPC, a DCS or PLC system?
Application of the control system is control of a small chemical plant ~3000 I/O.
Application of the control system is control of a small chemical plant ~3000 I/O.
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RE: Justification for data historian?
RE: Justification for data historian?
Often, you'll find a "new" problem, but careful review of past data will show that the problem existed for a long time, but was only now actually "discovered."
The historical data might then show the conditions what result in the "new" problem, and save you months of investigation.
TTFN
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RE: Justification for data historian?
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If we learn from our mistakes I'm getting a great education!
RE: Justification for data historian?
Roy
RE: Justification for data historian?
RE: Justification for data historian?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Justification for data historian?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Justification for data historian?
RE: Justification for data historian?
RE: Justification for data historian?
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If we learn from our mistakes I'm getting a great education!
RE: Justification for data historian?
Oh - I remember that's one of those things we bought years ago for chewing up paper isn't it?
Roy
RE: Justification for data historian?
In the early '80's we put data loggers in plants that had two paper boxes. One would feed the printer, the second to collect the printed paper. Nobody at the plant evaluated any of the data - only moved the paper to storage. I used the records to determine the time between a field gathering compressor trip and the plant inlet pressure falling to the low pressure alarm point, etc.
RE: Justification for data historian?
I also like paper chart back ups on sales meters, the lastrst flow computers fail and a paper chart comes in handy when there are $100,000,000 at stake.