Automation System
Light sensors:

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

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Automation System
Programmable controllers:

(a) and (c) above
are programmed using relay ladder logic
None of these
cannot perform functions other than relay logic
are widely used in many different industries

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Automation System
The SKETCHPAD system

All of these
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
None of these
is used for interactive Graphics
is expensive because it is sophisticated and make demands on the power and resources of the computer.

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