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

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
All of these
None of these
it is impossible to write a control program for a machine in any other logic

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Automation System
Microcomputer-based control sys-tems

All of these
will tend to increase in cost.
will just keep their present capability
None of these
will have more standard industrial application software available in the future.

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