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

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

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Automation System
CAE and CAM are linked through:

parts production and testing
None of these
NC tape programming and automated design
a common data base and communications system
assembly automation and tool production.

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