Ncu Link; Link Communication - Siemens SINUMERIK Series Function Manual

B3: Distributed systems - 840D sl only
2.1 Brief description
2.1.2

NCU link

2.1.2.1

Link communication

The NCU-link communication cycle allows an interpolation-synchronous cross-NCU data
exchange for the following applications:
● Cross-NCU data exchange via 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
Safety Integrated
If axial Safety Integrated functions are active for a link axis, data that is not safety-related is
exchanged between the local safety axis (link axis on NCUx) and the channel that is
traversing it (NCUy) via the NCU link. This also enables Safety Integrated-supporting
functions for link axes, such as velocity/speed monitoring-dependent setpoint limiting and
higher-order stop functions (STOP D/E).
Note
The Safety Integrated functions "Safe software limit switch" (SE) and "Safe software cam,
safe cam track" (SN) are not (yet) supported.
Link module
The link communication requires optional link modules. A link module is an optional
PROFINET module for isochronous real-time communication (IRT) via Ethernet. The link
module occupies the option slot of the NCU.
Quantity structure
As standard, a maximum of three NCUs can be interconnected to form a link group.
Note
For a specific project, on request to your local regional Siemens representative, further
NCUs can be integrated to form a link group.
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Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Extended Functions