Automation System
A sequence controller:

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

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Automation System
The use of specialized workstations:

has a high cost-performance tradeoff
provides limited growth potentials for 3-D
reduces the host computer workload
reduces the host computer workload and allows more users
None of these

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