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

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

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Automation System
Vision sensors:

will remain very costly
can not improve much in the next decade
All of these
will more closely match the capabilities of the human eye
None of these

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Automation System
A continuous process is:

self-contained in that raw materials enter the process and an identifiable products exits the process.
used only with analog controllers.
None of these
one that never shuts down
used only for simple tasks

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