Siemens SINUMERIK 840D sl Function Manual page 112

B3: Distributed systems - 840D sl only
3.2 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 3-15
● Symmetrical 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.
● Asymmetrical axis distribution
For an asymmetric axis distribution, each NCU traverses local and link axes from the
beginning. Unlike with symmetrical axis distribution, this results in a constant average
utilization of the link communication.
112
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
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions