Automation System
An encoder:

is used to send telegraph signals
converts a binary number to a decimal number.
None of these
can have only four keys
converts an input to a binary number

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Automation System
Today, programmable controllers:

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

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