Automation System
Digital signals:

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

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Automation System
A sequence controller:

is a mechanical only controller
is no longer in widespread use
None of these
is difficult to program
performs on/off control functions in relation to time.

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