Siemens SINAMICS S120 Commissioning Manual page 212

Diagnostics
3.2 Diagnostics via STARTER
The device cycle clock display flashes 3 times at around 1 Hz when the time slice is changed
from < 4 ms to ≥4 ms (see description under "Properties").
Note
Please refer to the online help for more information about parameterizing and operation.
Properties
● Up to 8 recording channels for each trace
● Device clock cycles of SINAMICS S120 trace for single traces:
● Two independent traces per Control Unit
● Endless trace
● Triggering
● STARTER commissioning tool
● Settable trace cycle: Integer multiples of the basic sampling time
● Averaging the trace values
210
When more than 4 channels per single trace are used, the trace's device clock cycle is
switched automatically from 0.125 ms (0.250 ms for vector control) to 4 ms. This action
ensures that the CU320's performance is not influenced too strongly by the trace.
4 channels: 0.125 ms (Servo)/0.250 ms (Vector)
8 channels: 4 ms (Servo/Vector)
The parameter data are written to the memory until this is full.
A ring buffer can be selected in order to avoid this. If the ring buffer is active, then
STARTER automatically starts again from the beginning to write to the trace memory
after the last trace parameter was saved.
Device cycle of the SINAMICS S120 trace for an endless trace:
– 4 channels: 0.125 ms (servo)/0.250 ms (vector)
– 8 channels: 4 ms (Servo/Vector)
The time slice 4 ms may not be available due to the system condition. In this case the
next higher time slice is used.
– Without triggering (recording immediately after start)
– Triggering on signal with edge or on level
– Automatic or adjustable scaling of display axes
– Signal measurement via cursor
If a float value with a clock cycle slower than the device cycle clock is recorded, then the
values recorded will not be averaged. This is achieved using parameter p4724.
Parameter p4724[0...1] "Trace averaging in time range" is "0" in the default setting.
Index "0" and "1" stand for both the traces each with 8 channels.
If the traced values should be averaged, then parameter p4724 should be set to "1".
Commissioning Manual, (IH1), 01/2011, 6SL3097-4AF00-0BP1
Commissioning Manual