Automation System
In the operation of a programmable controller:

All of these
mathematics cannot be performed
None of these
any latched data must be done using an external latching relay
all of the logic status is maintained in memory

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Automation System
Time proportioning control:

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

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