Automation System
Most continuous control actuators:

are of the time proportioning type
use a 4 to 20 mA current loop input
are used with standard continuous control loop
(b) and (c) above
None of these

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

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

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