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

None of these
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)
do not leave training manuals unsecured

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Automation System
Direct Numerical Control means:

using several computers to control one large machine
None of these
eliminating computers from the manufacturing process
complete elimination of a need for a human operator.
using one computer to control several machines

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