Ncu Link; Link Communication; General Information - Siemens SINUMERIK 840D sl Function Manual

3.2

NCU link

3.2.1

Link communication

3.2.1.1

General information

Figure 3-4
The NCU-link communication cycle allows an interpolator clock-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.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Link communication (principle)
B3: Distributed systems - 840D sl only
3.2 NCU link
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