Automation System
The program execution time:

will vary depending on the language used
cannot be changed once the program is written
None of these
All of these
must be slower than the fastest mechanical operation that is to be controlled

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Automation System
Today, programmable controllers:

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

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