Automation System
A program language:

is never machine dependent
is always machine dependent
All of these
defines the form of the instruction
None of these

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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 the best industrial control language ever developed.
All of these
it is impossible to write a control program for a machine in any other logic

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