Answer / rajkumar

If you are using a DCS (Distributed Control System), there
should be a diagnostic utility that you can run (this is
usually part of the system software). If your sotware scan
is structured correctly i.e. all software is called in
cyclic scans and not free scans, the utility should be able
to tell you the loading of these scan cycles.

You should also be aware that you are doing this under FAT
conditions. This would imply that most of your IO are not
connected, which in turn would push up your scan times for
all the diagnostic alarms comming in.

Answer / rnm

In my opnoin, Sacn time checking during FAT shall be input
simulation with one repeater block. Then go for cycle sacn
rate check, which will cover input,process block(PID) and
output. We know, there wiil be no O/P connected in field
and no much execution of loops. In this case, very
difficult to conclude this time.Better to check I/O
scanning rate.

relation between level and differential pressure.

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