Siemens sinumerik 840D sl Function Manual page 184

Detailed description
2.1 General Information About Cycle Times
Requirements
The system clock cycle, position-control cycle and interpolator cycle are defined in the
following machine data.
MD10050 $MN_SYSCLOCK_CYCLE_TIME (system clock cycle)
MD10060 $MN_POSCTRL_SYSCLOCK_TIME_RATIO (factor for position-control cycle)
MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO (factor for the interpolation cycle)
With MD10050, $MN_SYSCLOCK_CYCLE_TIME sets the system clock cycle for the system
software in seconds. The other cycles are multiples of the system clock cycle.
Figure 2-1
Note
MD10050 $MN_SYSCLOCK_CYCLE_TIME:
The system clock cycle is entered in seconds.
MD10060 $MN_POSCTRL_SYSCLOCK_TIME_RATIO:
The position-control cycle is entered as a factor of the system clock cycle.
MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO:
The interpolator cycle is entered as a factor of the system clock cycle.
Special functions: Cycle Times (G3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
Derivation of cycle times
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