Siemens S120 - X21 Profibus

Control Units, Control Unit Adapters and operating components
7.4 Control Unit CU310-2 DP (PROFIBUS)
AC Drive
290 Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
7.4.2.2
X21 PROFIBUS
The PROFIBUS interface X21 can be operated isochronously.
Table 7- 22 X21 PROFIBUS interface
Pin
Signal name
Meaning
Range
1
-
Not assigned
2
M24_SERV
Teleservice supply, ground
0 V
3
RxD/TxD-P
Receive/transmit 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 …
28.8 V)
8
RxD/TxD-N
Receive/transmit data N (A)
RS485
9 - Not assigned
Connector type
9-pin Sub-D socket
Note
A teleservice adapter can be connected to the PROFIBUS interface X21 for remote
diagnostics.
The power supply for the teleservic
e (terminals 2 and 7) can have a max. load of 150 mA.
PROFIBUS connector
For the first and last participants in a bus line, the terminating resistors must be switched in,
otherwise, data transmission will not function correctly.
The terminating resistors are activated in the connector.
The cable shield must be connected at both ends over large-surface area contacts.