Automation System
An operating system:

None of these
is useless in most control applications
provides ability for other programmers to understand the software structure
All of these
can help reduce software development time

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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 the best industrial control language ever developed.
it is impossible to write a control program for a machine in any other logic
None of these

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