Automation System
Light sensors:

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

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Automation System
Ergonomics refers to:

the cost relationship of the workstation versus productivity
the human aspect of the environment around the workstation as well as the workstation itself
the level of involvement the operator has with the workstation
the technology involved in the workstation itself
None of these

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Automation System
Today, programmable controllers:

are more powerful then the first controllers on the market
can be cost effective even when replacing just a few relays
None of these
All of these
are relatively low cost compared with the original digital equipment available for industrial control

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