February 2012 10 – 107
10.5 For error diagnosis
10.5.1 Triggering on error markers
With the integrated oscilloscope, you can make recordings with trigger on the following error markers
(defined by HEIDENHAIN):
îš„ M 4177 (erasable error message)
îš„ M 4178 (error message that causes an external EMERGENCY STOP)
Advantage of this method:
The integrated oscilloscope, which is started at any point in time, continuously makes recordings, until
an error message is issued on the machine.
The behavior of the selected signals shortly before the error event takes place can be examined at a
later time.
Figure: 75 % triggering on error marker M 4178, channel 6
It is also possible to trigger on the error markers defined by the OEM that are documented in the
PLC error table (e.g., M4812).
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