Automation System
Today, programmable controllers:

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

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Automation System
An encoder:

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

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Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

do not allow unbonded service people to work on your equipment
None of these
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not leave training manuals unsecured
Verify the reputation of the people installing your system

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