Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
The values displayed in menu: System resources of HMI Advanced refer to
the total power of the CPU, not to the CPU time share of the NCK set in MD
The values for T
plications active under Windows NT due to cache effects of the PCU proc-
essor. To calculate these value, it is therefore necessary to activate Win-
dows NT applications demanding a lot of CPU time in parallel with execu-
tion of NC parts programs.
When the maximum values for T
described above no longer change, you can calculate the above formula
with a value of 200 instead of 300.
The maximum value for the NCK CPU time share of 75% must not be ex-
ceeded. A value greater than 75% can lead to significant impairment (slow-
ing down) of Windows NT applications. If necessary, the values must be
adapted to the system clock cycle/position controller cycle (DP cycle time)
and/or interpolation cycle.
Alarm: "4240 CPU time overflow on the IPO or position controller level"
The DP cycle time/position controller cycle, the interpolation cycle, or the NC
CPU time share is set in such a way that not enough CPU time is available for
one of the two cyclic levels of the NC (position controller or interpolator).
Calculate the maximum values for T
the following machine data:
MD10185: NCK_PCOS_TIME_RATIO (NCK computation time portion)
MD10070: IPO_SYSCLOCK_TIME_RATIO (factor for interpolation cycle)
MD10050: SYSCLOCK_CYCLE_TIME (system clock cycle).
You must adjust the system clock cycle by changing the DP cycle time using
STEP7 "HW Config". To do that, proceed as you would for final parameteriza-
tion of a DP slave 611U. See Subsection 7.3.7, page 7-231f.
Description of Functions, Special Functions
G3 Cycle Times
10 NC Start-Up with HMI Advanced
are considerably influenced by ap-
displayed as you proceed as
10.3 System data
(see above) and adjust