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

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

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Automation System
Light sensors:

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

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