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PMAC-NC Technical Documentation Manual
Reference Point
Aside from Machine zero, a machine tool may need to locate other fixed
positions corresponding to attached hardware, i.e.: a tool changer. This position is called the reference point (which may coincide with Machine
zero). The tool can be moved to the reference point in two ways; manually
or automatically.
In general, manual reference point return is performed first after the machine power is turned on. Usually this is the same as the homing function,
since the reference point is at a fixed offset from the Machine zero position. In order to move the tool to the reference point for tool change thereafter, the function of automatic reference point return is used.
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NC 32 Bit for Mill Application