Automation System
In the operation of a programmable controller:

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

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Automation System
Relay ladder logic is used in a PC because:

All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is impossible to write a control program for a machine in any other logic
it is the best industrial control language ever developed.
None of these

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