Ncu Link; Link Communication; General Information - Siemens SINUMERIK Series Function Manual

2.2

NCU link

2.2.1

Link communication

2.2.1.1

General information

Figure 2-4
The NCU-link communication cycle allows an interpolation-synchronous cross-NCU data
exchange for the following applications:
● Cross-NCU link variable $A_DLx
● Cross-NCU traversing of axes and spindles using link axes and container-link axes
● Cross-NCU master value coupling of axes and spindles using lead-link axes
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Link communication (principle)
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.
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.
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.
B3: Distributed systems - 840D sl only
2.2 NCU link
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