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We do have a problem in the company that is one PT connected to PlC which is mean 1 out of 1 in PLC system we do have the PAHH is 55 mbar and PALL 8 mbar with a timer of 15 sec for the PAHH the problem started when PAHH goes more than the set point which is 55 it reached up to 71 but due to timer doesn't trip . We force it and we checked everything nothing there . We replaced the transmitter problem still there the reading goes more than the 55 bar the range for transmitte is 0- 60 mbar . So we did loop check , aculaizing valve , wiring all are okay . What the possible causes for this ???
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Answer Posted / jigar anadkat
Dear,
As you mentioned pressure shot up to 71 mBar which means channel goes to BAD state and it might not activate the logic. (Truly speaking it should but depends on how the logic has been created and what are the parameters set in IO assignment for failure situation).
If you you are using Yokogawa Prosafe RS the please make sure to take Chanel status as well in the logic configuration. So in case of IOP(+) as well as IOP(-) it will actuate the logic.
Moreover, there is a setting in IO parameter builder regarding input processing at fault situation. Please go through that as well.
Hope this will help you in trouble shooting.
Regards,
Jigar Anadkat
Instrument Engieer
IBN RUSHD
A SABIC affeliate.
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