06.03
10.3 System data
10-294
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Table 10-12 Cycle times: Machine data
Number Identifier Name/remarks Ref.
General ($MN_ ...)
10050 SYSCLOCK_CYCLE_TIME System clock cycle/only display data; is always
equal to the equidistant PROFIBUS DP cycle.
Note: with 840Di, only for display!
10060 POSCTRL_SYSCLOCK_TIME_RATIO Factor for the position control cycle/is set fixed to
the factor 1.
Note: is not displayed with the 840Di
10062 POSCTRL_CYCLE_DELAY Position control cycle offset
10070 IPO_SYSCLOCK_TIME_RATIO Factor for the interpolator cycle/can be freely se-
lected in integer multiples.
!
Caution
If you have changed the time cycles, check that the operating response of the
control is correct in all operating modes before ending the start-up process.
Note
The smaller the cycle times (PROFIBUS DP cycle) are selected, the higher is
the control quality of the drive and the surface finish of the workpiece.
10.3.9 Velocities
The maximum possible axis velocities and spindle speeds depend on the ma-
chine design, drive dynamics and the encoder limit frequency of the individual
drives.
The maximum programmable tool path velocity results from the maximum axis
velocities of the axes involved in the path programmed.
The maximum tool path velocity at which traversing is possible within a parts
program block results as follows:
V
max
progr. path length in parts program [mm or degrees]
IPO cycle [secs]
To guarantee that parts program blocks are executed continuously (control mar-
gin), the NC limits the tool path velocity within a parts program block to 90% of
the max. possible tool path velocity as follows:
Machine data
Max. axis velocity
or spindle speed
Max. progr.
tool path velocity
Max. tool path
velocity
Upper limit
10 NC Start-U
with HMI Advanced
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