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
All of these
are more powerful then the first controllers on the market

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Automation System
Semiconductor devices:

are less reliable than electro¬mechanical components
All of these
have a very short infant mortality period
usually have a very short MTBF (mean time between failure)
None of these

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Automation System
Time proportioning control:

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

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