Automation System
A process controller:

is useful in a continuous process control application
None of these
can interface to digital and analog I/O
All of these
can solve a PID process control equation easily

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Automation System
Today, programmable controllers:

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

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