Automation System
Today, programmable controllers:

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

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Automation System
The program execution time:

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

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