Detailed description
2.4 Referencing with incremental measurement systems
Basic logic functions: Reference Point Approach (R1)
20 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
The indicated value is equivalent to the distance between departure from the reference
cam and detection of the reference mark. If the values are too small, there is a risk that
the determination of the reference point will be nondeterministic, due to temperature
effects or fluctuations in the operating time of the cam signal.
Warning
If the reference cam adjustment is faulty or inaccurate, an incorrect zero mark can be
evaluated. The control then calculates an incorrect machine zero. As a result, the
machine axis will approach the wrong positions. Software limit switches, protected areas
and working area limitations act on incorrect positions and are therefore incapable of
protecting the machine. The path difference is +/- of the path covered by the machine
axis between 2 zero marks.
Phase 2: Features
• Feedrate override is not active.
Internal motion with feedrate override = 100%.
If a feedrate override of 0% is specified, motion is aborted.
• Feed stop (channelspecific and axisspecific) is active.
• NC-STOP and NC-START are not active.
• If the machine axis does not arrive at Phase 2 within the parameterized distance of the
reference mark (encoder zero mark), the machine axis will be stopped:
MD34060 $MA_REFP_MAX_MARKER_DIST (max. distance to the reference mark)
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