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

do not leave training manuals unsecured
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)
Verify the reputation of the people installing your system

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Automation System
An operating system:

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

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Automation System
Time proportioning control:

can be used on a PM550 programmable process controller
a and b above.
is less efficient than normal PID control
cannot use a TM990 micro¬computer
None of these

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Automation System
Programmable controllers:

cannot perform functions other than relay logic
(a) and (c) above
None of these
are widely used in many different industries
are programmed using relay ladder logic

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