Automation System
A semi-continuous operation means:

a computer is a required part of the machine
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
coffee breaks are allowed for the operator
the operation is continuous each shift, but stops between shifts
None of these

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Automation System
What is offset error?

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

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