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
it is the best industrial control language ever developed.
None of these
All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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Automation System
Light sensors:

never use infrared light as light source
work in direct sunlight
cannot be used a s limit switches.
come in a wide variety of mounting styles
None of these

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Automation System
CAE and CAM are linked through:

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

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