Automation System
A programmable controller:

All of these
both (a) and (b)
is easier to troubleshoot than standard relay logic
allows faster machine checkout
None of these

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Automation System
Digital signals:

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

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