Automation System
Today, programmable controllers:

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

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Automation System
Stepping motors:

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

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