Diagnosis → System Utilization - Siemens SINUMERIK 840D sl Commissioning Manual

8.8 Diagnosis → System utilization
System utilization
The channel-specific system utilization is displayed in the "Diagnostics" → Menu forward key →
"System utilization" operating area:
Total system utilization in milliseconds [ms]: MD10050 $MN_SYSCLOCK_CYCLE_TIME
(system base cycle)
Component
Position controller
Interpolator
Synchronized actions
Preprocessing
NC load from position control‐
ler and interpolator
Interpolator buffer level
Observe the settings for isochronous operation: (Page 70)
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA
Current value display
Position-control cycle time display: MD10061 $MN_POSTCTRL_CY‐
CLE_TIME
Interpolation cycle display: MD10071 $MN_IPO_CYCLE_TIME
To display the time required for synchronized actions, activate
MD11510 $MN_IPO_MAX_LOAD. Enter the proportion of the interpo‐
lator cycle in %.
The factor for the interpolator cycle can be set in
MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO.
MD10185 $MN_NCK_PCOS_TIME_RATIO = 90 (default setting)
The average current load should not exceed 50%.
In order to have sufficient reserves for the program processing, the
maximum load in typical operations should not exceed 75%.
The channel-specific filling level is displayed in
MD28060 $MC_MM_NUM_IPO_BUFFER_SIZE, and indicates wheth‐
er block preparation for block processing can commence.
Jerky machining in continuous-path mode, if for instance a number of
short traversing blocks have been programmed in succession, is a typ‐
ical indicator of the interpolator buffer idling.
The SINUMERIK Operate Online Help provides more detailed, context-related
information about the machine data.
NC commissioning
8.8 Diagnosis → System utilization
267