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

None of these
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
All of these

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Automation System
Light sensors:

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

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