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

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

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Automation System
The "walk-through" method of programming a robot involves:

physically moving the robot through all the motions it is to repeat
None of these
walking through your suggested procedure with your supervisor prior to programming
moving the robot from one location to another
All of these

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