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

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

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Automation System
How is the integral mode implemented on a digital controller?

the error is divided into discrete amounts
the error signal is summed over a discrete time interval and accumulated by the controller
All of these
the digital controller cannot handle integral mode
None of these

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