Automation System
Programmable controllers:

are widely used in many different industries
None of these
cannot perform functions other than relay logic
(a) and (c) above
are programmed using relay ladder logic

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

None 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
All of these
it is the best industrial control language ever developed.

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