X126 Profibus - Siemens SINAMICS S120 Manual

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8.20 K90, Control Unit CU320-2 DP
8.20.6

X126 PROFIBUS

Table 8- 23 X126 PROFIBUS interface
Pin
1
2
3
4
5
6
7
8
9
Connector type: 9-pin Sub-D socket
Note
Remote diagnostics
A teleservice adapter can be connected to the PROFIBUS interface (X126) for remote
diagnostics.
The power supply for the teleservice (terminals 2 and 7) can have a max. load of 150 mA.
Use equipotential bonding conductor
A potential 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. If a
potential bonding conductor is not used, high leakage currents that could destroy the
Control Unit or other PROFIBUS nodes can be conducted via the PROFIBUS cable.
Do not connect CAN cables to interface X126
No CAN cables must be connected to interface X126. If CAN cables are connected, the
Control Unit and other CAN bus nodes may be destroyed.
PROFIBUS connectors
The first and last nodes in a bus must contain terminating resistors. Otherwise, data
transmission will not function correctly.
The bus terminating resistors are activated in the connector.
The cable shield must be connected at both ends and over a large surface area.
430
Signal name Meaning
- Not assigned
M24_SERV Teleservice supply, ground
RxD / TxD–P Receive/transmit data P (B)
CNTR–P Control signal
DGND PROFIBUS data reference potential
VP Supply voltage plus
P24_SERV Teleservice supply, + (24 V)
RxD / TxD–N Receive/transmit data N (A)
- Not assigned
CAUTION
CAUTION
Range
0 V
RS485
TTL
5 V ± 10%
24 V (20.4 V to 28.8 V)
RS485
Cabinet Modules
Manual, 03/2013, A5E03263538A