Automation System
Computer-based controllers:

(a) and (c) above
are very difficult to change
are very flexible
None of these
should be built in a modular fashion wherever possible

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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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