Automation System
A sequence controller:

performs on/off control functions in relation to time.
None of these
is difficult to program
is no longer in widespread use
is a mechanical only controller

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Automation System
A semi-continuous operation means:

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

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