Answer / jobby c johnson

in process control selection of a particular controller is
based on the application and what are process parameters that
you are going to measure.
based on the external conditions you have to design the data
acquisition system. some times the voltage level will not be
matching, so you requires a voltage translators(eg:).

there will be a process requirement saying that you need the
overall response of the system with in this much time, with
minimum error etc based on those parameters you have to tune
the controller parameters.

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