Siemens SINUMERIK Series Function Manual page 108

B3: Distributed systems - 840D sl only
2.2 NCU link
Notes on the parameter assignment
Container axis distribution and communications utilization
In the case of a plant with several NCUs that traverse alternately axes of other NCUs (link
axes) in conjunction with axis containers, the type and manner how the link axes are
distributed within the axis container decide on the utilization of the link communication.
①
②
③
④
Figure 2-15
● Symmetrical axis distribution
● Asymmetrical axis distribution
108
Blue slot: Refers to a drive connected to the NCU1
Red slot: Refers to a drive connected to the NCU2
Drives connected to NCU1
Drives connected to NCU2
Axis distribution
In the case of a symmetrical axis distribution, each NCU first traverses only local axes.
This means no link communication occurs. Provided all NCUs only traverse link axes,
each transition of the axis container increases the utilization of the link communication up
to a maximum.
For an asymmetric axis distribution, each NCU traverses local and link axes from the
beginning. Unlike the symmetrical axis distribution, this results in a "constant" average
utilization of the link communication.
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Extended Functions