Automation System
Today, programmable controllers:

are relatively low cost compared with the original digital equipment available for industrial control
are more powerful then the first controllers on the market
All of these
can be cost effective even when replacing just a few relays
None of these

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Automation System
CAE and CAM are linked through:

a common data base and communications system
None of these
parts production and testing
assembly automation and tool production.
NC tape programming and automated design

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

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

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