Siemens SINUMERIK 840D sl Commissioning Manual page 166

Commissioning NC-controlled drives
6.6 Diagnostics → Trace
6. Softkey "Quick List" is activated. Select variable $AN_SLTRACE and acknowledge with
"OK".
7. Matching the example, select "If variable" to stop the trace and acknowledge with "OK".
8. Select the "View trace >" softkey to open the trace view.
9. Select the "Start trace" softkey to activate the trace.
10.Execute the part program with "NC Start".
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CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA