Automation System
Stepping motors:

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

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

the user must have access to both hardware and software
None of these
technical assistance must be provided to the user.
the system must make provision for new techniques.
there should be a common 3-D part description system.

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Automation System
Time proportioning control:

a and b above.
can be used on a PM550 programmable process controller
is less efficient than normal PID control
cannot use a TM990 micro¬computer
None of these

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