Siemens SINAMICS Series Operating Instructions Manual page 184

Connecting
6.9 Assignment of terminals and connectors
Table 6- 38 Terminal X179
Terminal Function
X179
1 Supply (output)
2 Ground, digital M
3 TXD1
4 RXD1
5 TXD2
6 RXD2
"Control Unit (CUD)" module
Note
Only one of the two interfaces – RS485 (X178-3, 4) or RS232 (X179-3, 4) – may be used.
PROFIBUS connection
Table 6- 39 PROFIBUS connector assignment
Connector Pin
X126
1
2
3
4
5
6
7
8
9
"Control Unit (CUD)" module
182
Technical specifications
4.4 to 5.4 V DC short-circuit proof, maximum load 300 mA
Internal supply related to internal ground terminal
Send cable, RS232 standard (V.24)
Receive cable, RS232 standard (V.24)
Send cable, RS232 standard (V.24)
Receive cable, RS232 standard (V.24)
Signal name Technical specifications
- Not assigned
- Not assigned
RxD/TxD-P RS485 receive/transmit data P (B)
CNTR-P Control signal (TTL)
DGND PROFIBUS data ground
VP Positive supply voltage (5 V +/-10%)
- Not assigned
RxD/TxD-N RS485 receive/transmit data N (A)
- Not assigned
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A