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

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Automation System
An operating system:

None of these
is useless in most control applications
can help reduce software development time
All of these
provides ability for other programmers to understand the software structure

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