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

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Automation System
Vision sensors:

can not improve much in the next decade
None of these
will remain very costly
will more closely match the capabilities of the human eye
All of these

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Automation System
A stepping motor;

has a commutator
is a good choice where continuous rotation is needed
can index positional movement.
has a speed proportional to voltage input
None of these

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