Siemens SINUMERIK Series

B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
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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.