Automation System
Stepping motors:

can run at varying speeds
can run both clockwise and counterclockwise
do not require commutators
All of these
can be built to index different amounts by changing the pole configuration

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

do not allow unbonded service people to work on your equipment
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

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