X126 Profibus - Siemens SINAMICS Equipment Manual

The maximum cable length that can be connected is 30 m.
Note
The two "+" or "M" terminals are jumpered in the connector. This ensures that the supply
voltage is looped through.
Note
The terminal block must be screwed on tightly using a flat-bladed screwdriver.
3.2.2.6

X126 PROFIBUS

The PROFIBUS interface can be operated isochronously.
Table 3-20 X126 PROFIBUS interface
Pin
1
2
3
4
5
6
7
8
9
Connector type: 9-pin Sub-D socket
A teleservice adapter can be connected to the PROFIBUS interface for remote diagnostics.
The power supply for the teleservice (terminals 2 and 7) can have a load of up to 150 mA.
NOTICE
Damage to components due to connecting a CAN bus cable
If a CAN bus cable is connected to the X126 interface, this can damage the Control Unit or
other CAN bus nodes.
● Do not connect any CAN bus cables to the X126 interface.
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.
Supplementary component descriptions
Manual, 06/2019
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
3.2 Control Unit CU320-2 DP (PROFIBUS)
Range
-
0 V
RS485
TTL
-
5 V ± 10%
24 V (20.4 ... 28.8 V)
RS485
-
Control Units
35