Siemens SINUMERIK 828D Commissioning Manual page 432

Customizing the "Machine" operating area
5.11 Activate machining time recording
Note
Machine data MD18370, MD18371, and MD28302 are still valid for machining time recording
when they are assigned higher values.
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Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3
SINUMERIK Operate