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

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

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Automation System
High-level languages:

are very difficult to use
require knowledge of the computer design
None of these
are "procedure-oriented"
cannot be used with automatic systems.

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