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

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

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Automation System
Semiconductor devices:

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

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