Automation System
Light sensors:

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

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

the system must make provision for new techniques.
there should be a common 3-D part description system.
technical assistance must be provided to the user.
the user must have access to both hardware and software
None of these

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