Automation System
Today, programmable controllers:

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

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Automation System
Time proportioning control:

None of these
is less efficient than normal PID control
can be used on a PM550 programmable process controller
a and b above.
cannot use a TM990 micro¬computer

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