Automation System
The difference between CAD and CAM is that CAD software is directed at product design while CAM software is:

concerned with management programs
concerned with production and control of tool design
specifically for PC-board design
None of these
designed for communications

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
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
None of these

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