Automation System
Programmable controllers:

(a) and (c) above
None of these
are widely used in many different industries
cannot perform functions other than relay logic
are programmed using relay ladder logic

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

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

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