Automation System
Today, programmable controllers:

None of these
can be cost effective even when replacing just a few relays
All of these
are more powerful then the first controllers on the market
are relatively low cost compared with the original digital equipment available for industrial control

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Automation System
What is offset error?

the difference between the sensor input and the absolute sensed parameter.
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

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