Automation System
Relay ladder logic is used in a PC because:

All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is the best industrial control language ever developed.
it is impossible to write a control program for a machine in any other logic
None of these

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Automation System
The use of specialized workstations:

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

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