Answer Posted / nachiket dani

Usually used term in Distributed Control System design-
after the logic for the process has been programmed into
the DCS software,the controller cabinet alongwith the IO
modules is interfaced to the server on which the logic
resides.The IOs are assigned as required and circuit
continuity check is carried out-LOOP CHECKING..Outputs are
forced to some value(universal) or forced high(binary) and
the signal level is checked at the output Terminal block of
the IO module.Similarly for Input checks, Voltage/Current
is fed via a calibrator at the Input Terminal Block (1 by
1) and signal is detected via the monitoring mode on the
DCS software..This is to ensure circuit continuity and
scaling(signal limits)-it requires time and usually done as
pre-FAT or FAT procedure.

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