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 ???
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.
Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
How to measure the dust in chimney(spm)?
What is force balance principle?
What is the diffrence between digital signal processing and discrete signal processing?
Hi my friends Is any one who can assist me in knowing the typical interview questions for system engineer at General Electric pty Ltd
why we use cascade control and feed foreword control in 3 element control of boiler drum ?what is feed forward and cascade control system ?
can any one explain in which term we are flow flow is it volumetric r is it mass? and y
OBJECTIVE TYPE QUESTIONS OF ANALYTICAL INSTRUMENTATION
What you mean by multi stage control vavles?
what is the procedure of belt scale calibration?
Isometric drawings are generated during _________________ phase of a project
Why the ammonia and Nitric Acid level indicators is with millimeter ? and What is the conversion form millimeters that level indicator indicate to weight ?
What is the advantage of using locally fabricated hook ups over Pre fabricated hook ups in process instrumentation?
What are the types of control valves available
Which Signal hart communicator work? If there any signal change when hart connect while transmitter in line ?
what is interlock system and why we use of this?