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

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

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Automation System
A continuous process is:

used only for simple tasks
None of these
self-contained in that raw materials enter the process and an identifiable products exits the process.
one that never shuts down
used only with analog controllers.

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Automation System
An operating system:

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

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