Siemens SINUMERIK 840Di Manual page 292

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10 NC Start-Up with HMI Advanced
10.3 System data
Interpolation cycle
NCK CPU time
share
Default value
Individual setting
10-292
The interpolation cycle can be freely selected in integer multiples of the position
controller cycle.
S
MD10070 IPO_SYSCLOCK_TIME_RATIO (factor for the interpolation cycle)
The processor power of the PCU must be shared between the NC and Win-
dows NT. By default, the NC is assigned 65%.
The value for the CPU time share of the NC is the maximum value that the NC
will only use in the worst case. If the NCK requires less computation time, it will
cede it dynamically to Windows NT.
É É É É
Windows NT
É É É É
Part 1
É É É É
T
DP cycle time: DP cycle time
DP
T
Master time: Shift of starting time of the NC
M
position control
Fig. 10-3 CPU time sharing between Windows NT and NC
In NC machine data
S
MD10185: NCK_PCOS_TIME_RATIO (NCK computation time portion)
the maximum CPU time share of the NC is set with reference to a DP cycle. The
default value is 65%.
An individual setting can only be made by the following formula:
MD10185 >= 300 * (T
pos max
with:
T
[ms] and T
pos max
IPO max
interpolator .
Display on HMI Advanced (optional):
Operating area switchover > Diagnosis > Service displays >
System resources
MD10070: IPO_SYSCLOCK_TIME_RATIO (factor for interpolation clock pulse)
MD10071: IPO_CYCLE_TIME (interpolator clock pulse) [ms].
T
DP
T
M
NC
Part 1
É É É É É
(general)
Windows NT
É É É É É
Part 2
É É É É É
* MD10070 + T
IPO max
[ms]: maximum netruntimes of the position controller or
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03
NC
Part 2
(position controller
and
interpolator)
+ 0.2msecs) / MD10071

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