Siemens SINAMICS DCM Manual page 179

Connecting
6.9 Assignment of terminals and connectors
Generally speaking, a twisted cable pair with a single pair shield is sufficient for each track.
This reduces crosstalk between the cables. Shielding all the pairs provides protection
against interference pulses. The shield should be connected to the SINAMICS DC MASTER
shield support over a large area.
Note
For connecting an incremental encoder (see also Chapter "Applications").
Figure 6-52 Arrangement X178 and X179
Serial interface to AOP30/USS interface
Table 6- 37 Terminal X178
Terminal Function
X178
1 Supply (output)
2 Ground, AOP M
3 RX+/TX+
4 RX-/TX-
5 Ground, digital M
6 Ground, digital M
"Control Unit (CUD)" module
180
Technical specifications
24 VDC short-circuit proof, maximum load 200 mA
Internal supply related to internal ground terminal
Send and receive cable, RS485, two-wire
Positive differential input/output
Send and receive cable, RS485, two-wire
Negative differential input/output
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
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SINAMICS DCM DC Converter