Technical data

Download, testing and diagnostics
CPU 317T: Technology Functions
A5E00251798-03
8-21
Trace configuration (recording / trigger conditions
Field / button Description
Condition
(not SINAMICS
Trace)
Select here when the values of the variables are to be recorded.
Isochronous recording
The variable value is recorded in synchronism with the selected clock.
1st Select the "Cycle clock."
2nd Enter a number as "coefficient" in order to log the values in each n-th cycle.
Length
Maximum
(ms/number)
SINAMICS Trace:
Max. duration
This indicates the maximum logging time in ms in one cycle. The maximum
recording length depends on the size of memory in the Technology CPU and on
the recording cycle. This period is calculated automatically and displayed in
ONLINE mode. In OFFLINE mode, a minimum value is defined as a base value
for the recording.
Note:
The maximum available memory is shared between the various trace blocks. If
you have already set the duration of trace 1 to maximum, you will not be able to
log any values at the other trace blocks.
Length
Time (ms/number)
SINAMICS Trace:
Recording duration
Here you enter the logging time in ms. It can only be a multiple of the maximum
duration. The system will modify your input appropriately.
In ONLINE mode, you can transfer the maximum duration as recording duration in
the SINAMICS trace. Click "Start".
Length
Endless trace
(not SINAMICS
Trace)
The endless trace option is available only for trigger types "Immediate recording"
and "At start of a function generator.".
When you enable endless trace, the recording it not limited in time. The recorded
data are written alternately to two ring buffers in the PLC. If one of the buffers can
not backup anymore data, its data are transferred to S7T Config, and the new
data are written to the second ring buffer. The infinite trace function continues
recording until the available memory space (hard disk drive of the PG / PC) is
used up.
3rd Set the "Endless trace" check box as required.
4th Click "Options" to configure the ring buffers (number of measured values per
channel) and the display range for measured data.
If the endless trace is written to a highly fragmented hard disk, it is possible that
gaps occur in long trace recordings that exhaust the hard disk capacity. This
behavior occurs in particular on lowperformance PC systems.
Remedy:
• Release sufficient hard disk space for the recording
• If necessary, use the ring buffer function of the endless trace