Siemens SINAMICS S120 - X126 Profibus

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8.20 K90, Control Unit CU320-2 DP
Cabinet Modules NEMA
410 Manual, 04/2014, A5E03586450A
8.20.6
X126 PROFIBUS
Table 8- 23 X126 PROFIBUS interface
Pin
Signal name
Meaning
Range
1
-
Not assigned
2
M24_SERV
Power supply for teleservice, ground
0 V
3
RxD/TxD–P
Receive/send data P (B)
RS485
4 CNTR–P Control signal TTL
5
DGND
PROFIBUS data reference potential
6 VP Supply voltage plus 5 V ± 10 %
7
P24_SERV
Power supply for teleservice, + (24 V)
24 V (20.4 to 28.8 V)
8
RxD/TxD–N
Receive/send data N (A)
RS485
9 - Not assigned
Connector type: 9-pin sub D socket
NOTICE
Damage to the Control Unit or other PROFIBUS nodes due to high leakage currents
If a suitable equipotential bonding conductor is not used, significant leakage currents can
flow along the PROFIBUS cable and destroy the Control Unit or other PROFIBUS nodes.
• An equipotential bonding conductor with a cross-section of at least 25 mm² must be
used between components in a system that are located at a distance from each other.
NOTICE
Damage to the Control Unit or other CAN bus nodes due to the connection of a CAN cable
If a CAN cable is connected to the X126 interface, this can destroy the Control Unit or other
CAN bus nodes.
• Do not connect a CAN cable to the X126 interface.
Note
Remote diagnostics
A teleservice adapter can be connected to the PROFIBUS interface (X126) for remote
diagnostics.
The power supply for the teleser
vice (terminals 2 and 7) can have a max. load of 150 mA.