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

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Automation System
Digital signals:

None of these
have a sinusoidal shape.
can have three possible levels
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level

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Automation System
Time proportioning control:

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

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