Automation System
Today, programmable controllers:

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

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Automation System
Semiconductor devices:

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

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