Automation System
Historically, central systems were used because:

None of these
memory consumed a large amount of power
memory was very expensive
semiconductor memory was not available
All of these

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Automation System
What is offset error?

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

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