Automation System
Light sensors:

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

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Automation System
How is the integral mode implemented on a digital controller?

the digital controller cannot handle integral mode
the error signal is summed over a discrete time interval and accumulated by the controller
None of these
All of these
the error is divided into discrete amounts

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