Automation System
The coordinate system used to describe a workpiece:

All of these
is defined with respect to a point on the machine
None of these
is always two-dimensional
changes from part to part

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Automation System
Time proportioning control:

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

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

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