Siemens SINUMERIK 840D sl Operating Manual page 364

Create MyConfig - Topo
6.4 Topo - operation
3. You can now modify the name of the topology and wire the "Bus 3" directly to an NCU.
The slave is created automatically.
Note
Wiring of external CU, e.g. CU320
Note that these cannot be connected to the internal "Bus 3." To do this, first insert the
relevant bus 1, 2, 4 ... into the topology.
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SINUMERIK Integrate Create MyConfig - Diff, Expert, Topo
Operating Manual, 11/2016, A5E36537479B-AD