Automation System
Time proportioning control:

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

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Automation System
An operating system:

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

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