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
Semiconductor devices:

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

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