Siemens SINUMERIK 840Di sl Commissioning Manual page 377

Figure 11-3
● MD10185 $MN_NCK_PCOS_TIME_RATIO (CPU time share NC)
Individual setting
The default value for the NC CPU time share is 50%. An individual setting can only be made
by the following formula:
MD10185 >= 300 * (T
with:
● T
● MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO (factor for the interpolation cycle)
● MD10071 $MN_IPO_CYCLE_TIME (interpolator cycle) [ms]
The values for T
Windows XP due to cache effects of the PCU processor. To calculate these value, it is
therefore necessary to activate Windows XP applications demanding a lot of CPU time in
parallel with execution of NC part programs.
When the maximum values for T
no longer change, you can calculate the above formula with a value of 200 instead of 300.
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
CPU time division between Windows XP and NC
Pos max
and T
Pos max IPO max
T [ms] and T
Pos max IPO max
controller or interpolator. The data is displayed via HMI Advanced (option) under:
Operating area switchover > Diagnosis > Service Displays > System Resources
Note
The values displayed by HMI Advanced in the System Resources menu refer to the total
power of the CPU, not just to the CPU time share of the NC set via MD 10185
$MN_NCK_PCOS_TIME_RATIO.
and T
pos max
* MD10070 + T + 0.2ms) / MD10071
IPO max
[ms] are the relevant maximum netruntime of the position
are considerably influenced by applications active under
IPO max
and T displayed as you proceed as described above
pos IPO
NC Commissioning with HMI Advanced
11.3 System data
377