Automation System
One advantage of a PC in industrial control is that it:

is unreliable because there are no moving parts
None of these
has a reliable long life compared to relay logic
is very difficult for the inexperienced programmer to understand
All of these

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Automation System
Sensors:

None of these
are not important in automation
will be much smarter and more sophisticated in the future
probably will not improve over the next decade
are easily developed

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