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

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

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Automation System
The SKETCHPAD system

is expensive because it is sophisticated and make demands on the power and resources of the computer.
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
All of these
None of these
is used for interactive Graphics

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Automation System
Time proportioning control:

can be used on a PM550 programmable process controller
is less efficient than normal PID control
None of these
cannot use a TM990 micro¬computer
a and b above.

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