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

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

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

technical assistance must be provided to the user.
the system must make provision for new techniques.
there should be a common 3-D part description system.
None of these
the user must have access to both hardware and software

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