Automation System
Programmable controllers:

are widely used in many different industries
None of these
(a) and (c) above
cannot perform functions other than relay logic
are programmed using relay ladder logic

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Automation System
Semiconductor devices:

have a very short infant mortality period
are less reliable than electro¬mechanical components
All of these
usually have a very short MTBF (mean time between failure)
None of these

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