Siemens SINUMERIK 840D sl Commissioning Manual page 205

Signal selection
"Axis/spindle name" input field
The cursor must be positioned on the "Axis/spindle name" list box of the trace concerned.
You can select it with the softkeys "Axis+" and "Axis-" or by accepting a value from the drop-
down list box.
"Signal selection" input field
The cursor must be positioned on the "Signal selection" list box of the trace concerned. The
selection is made through acceptance from the drop-down list box.
The available selection options depend on the existing configuration and activated functions.
Measuring parameters
"Measuring duration" input field
The measuring time is written directly into the "Measuring duration" input field.
"Trigger time" input field
Direct entry of pre-triggering or post-triggering. With negative input values (leading sign
minus -) recording begins at the set time before the trigger event.
With positive input values (without sign) recording starts the time set after the triggering
event.
Condition: Trigger time + measuring duration ≥ 0.
"Trigger" input field
The trigger type is displayed in the "Trigger" drop-down list box. The trigger always refers to
Trace 1. When the trigger condition is satisfied, Traces 2 to 4 are started simultaneously.
Settable trigger conditions:
● "No trigger", i.e. measurement starts when you press the softkey "Start" (all traces are
● "Positive edge"
● "Negative edge"
● "Trigger event from the part program"
Reference
SINUMERIK 840D sl / 840Di sl System Variable Manual
IBN CNC: NCK, PLC, drive
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
started synchronously)
The trace can be started via an NC part program in conjunction with the system variable
$AA_SCTRACE [axis identifier].
Optimize the drive.
11.4 Servo trace
205