Automation System
In the operation of a programmable controller:

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

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Automation System
Semiconductor devices:

are less reliable than electro¬mechanical components
All of these
None of these
have a very short infant mortality period
usually have a very short MTBF (mean time between failure)

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