Automation System
Today, programmable controllers:

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

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Automation System
How is the integral mode implemented on a digital controller?

the digital controller cannot handle integral mode
the error is divided into discrete amounts
All of these
None of these
the error signal is summed over a discrete time interval and accumulated by the controller

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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
coffee breaks are allowed for the operator
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.

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