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
All of these
the error is divided into discrete amounts
None of these
the digital controller cannot handle integral mode

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Automation System
Digital signals:

have a sinusoidal shape.
are assigned values of 1 or 0 depending on the voltage level
can have three possible levels
None of these
have a frequency measured in units of hertz

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