Automation System
Digitizers can be converted from "dumb" to "smart" through the addition of:

a scanner
a microprocessor
an electromagnetic coupling
None of these
keyboard

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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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