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Both VME-based and PLC-based stepper motor
controls have been successfully developed and
implemented. Both have proved to be reliable and easy to
maintain.
PLC-based controls have the following advantages:
• Fewer custom interface modules
• Less cabinet wiring
• Directly connects to24 vdc limit switches
• Easier to integrate motion control and interlock logic
• Safer limit switch response
VME-based controls have the following advantages:
• More complete device driver
• Less custom device driver logic
• Higher density per module (8 channel vs.4)
• Faster EPICS updates
• Auxiliary outputs included on VME module
