Automation System
Analog and digital controllers:

All of these
cost the same to build
accept the same input signals
None of these
can be changed with equal case

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Automation System
The program execution time:

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

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Automation System
Today, programmable controllers:

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

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