Activating Ncu Links With Different Interpolation Cycles; Different Ipo Cycles, Behavior At Power On, Reset, Etc; System Variable With Different Interpolation Cycles - Siemens SINUMERIK 840D sl Function Manual

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
● Axis container
● Acceleration and deceleration processes on axes with slower interpolation or position
2.12.4

Activating NCU links with different interpolation cycles

● Setting different IPO cycle times in one link grouping
● Set bit 1 in machine data:
● The option "NCU link with different interpolation cycles" is available.
Example
Please refer to Section "Examples" for an example of eccentric turning using the "NCU link
with different interpolation cycles" function.
2.12.5

Different IPO cycles, behavior at power ON, RESET, etc.

The necessary setpoint delay on the servo causes a delay for two link cycles during power
up, at reset, at New Config, etc. At reset, an additional delay of at least two link cycles is
required to account for the necessary synchronization.
2.12.6

System variable with different interpolation cycles

There are no new system variables.
The existing general system variable $A_LINK_TRANS_RATE only displays a value not
equal to zero in the link communication cycle on an NCU with an IPO cycle with a shorter
length than the link communication cycle. The displayed value is available to the user; the
transfer is only really conducted in this cycle.
If it is not possible to transfer all the link variables in one cycle, alarm 14764 "NCU link
cannot transfer all link variables at once" is displayed as previously. This alarm can be
suppressed.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
– It is only permissible to switch axis containers with rotating spindles on NCUs with IPO
cycles that are equal to the link cycle.
– Axis containers can also be switched with motionless axes and spindle on the NCUs
with faster IPO cycles.
controller cycles will cause contour errors.
MD18780 $MN_MM_NCU_LINK_MASK
2.12 NCU link with different interpolation cycles
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