Automation System
A semi-continuous operation means:

the operation is continuous each shift, but stops between shifts
None of these
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

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Automation System
Today, programmable controllers:

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

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