Automation System
An operating system:

All of these
can help reduce software development time
None of these
is useless in most control applications
provides ability for other programmers to understand the software structure

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Automation System
Time proportioning control:

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

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