Siemens SINUMERIK Series Function Manual

B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
108 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
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.
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① Blue slot: Refers to a drive connected to the NCU1
② Red slot: Refers to a drive connected to the NCU2
③ Drives connected to NCU1
④ Drives connected to NCU2
Figure 2-15 Axis distribution
● 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 the symmetrical axis distribution, this results in a "constant" average
utilization of the link communication.

Siemens SINUMERIK Series Specifications

General

Axes Control	Up to 31 axes
Category	Control Unit
Manufacturer	Siemens
Series	SINUMERIK
Control Type	CNC
Communication Interfaces	Ethernet, USB
Operating Temperature	0°C to 45°C
Protection Class	IP20
Power Supply	24V DC
Display	Color TFT LCD