Siemens SINUMERIK Series Function Manual

B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
79
2.2 NCU link
2.2.1 Link communication
2.2.1.1 General information
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Figure 2-4 Link communication (principle)
The NCU-link communication cycle allows an interpolation-synchronous cross-NCU data
exchange for the following applications:
● Cross-NCU link variable $A_DLx
All the NCUs involved with the NCU-link communication have a common view of the link
variables because they are exchanged via the NCU link interpolator cycle clock-
synchronous between the NCU of the link group.
● Cross-NCU traversing of axes and spindles using link axes and container-link axes
If single or interpolation axis traversal is made from a channel of an NCU, NCU-link
setpoints can also be transferred to axes physically connected to another NCU of the link
group. These axes are designated as link axes.
● Cross-NCU master value coupling of axes and spindles using lead-link axes
NCU1 traverses axis X1 (leading axis), the setpoints are transferred to a link axis of
NCU2 (lead-link axis) via the NCU link. Coupling of axis X2 is realized in NCU2 on this
lead-link axis. This means axis X2 is indirectly the following axis of X1.

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