Automation System
Today, programmable controllers:

are more powerful then the first controllers on the market
All of these
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
None of these

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Automation System
A continuous process is:

self-contained in that raw materials enter the process and an identifiable products exits the process.
used only for simple tasks
used only with analog controllers.
one that never shuts down
None of these

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