Automation System
Today, programmable controllers:

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

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Automation System
Direct Numerical Control means:

complete elimination of a need for a human operator.
using several computers to control one large machine
None of these
using one computer to control several machines
eliminating computers from the manufacturing process

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