Automation System
Programmable controllers:

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

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Automation System
Straight-line operations:

can include diagonal cuts if they aren't curved
All of these
must be limited to two per workpiece
must be parallel to one of the axes of the coordinate system
None of these

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Automation System
Today, programmable controllers:

None of these
are relatively low cost compared with the original digital equipment available for industrial control
All of these
are more powerful then the first controllers on the market
can be cost effective even when replacing just a few relays

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