Automation System
Relay ladder logic is used in a PC because:

most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is the best industrial control language ever developed.
None of these
it is impossible to write a control program for a machine in any other logic
All of these

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Automation System
What is offset error?

the difference between the control setpoint value and the actual value.
All of these
the difference between the controller output and the setting of the manipulated variable.
None of these
the difference between the sensor input and the absolute sensed parameter.

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