Siemens SIMATIC S7-400 Reference Manual page 370

PROFIBUS DP master interface IM 467/IM 467 FO
8.3 Connection to PROFIBUS DP
Connector pin assignment
The electrical interface used to connect to PROFIBUS DP (9-pin sub D socket) is specified in
the following table.
Pin no.
1
2
3
4
5
6
7
8
9
370
INTF
EXTF
RUN
STOP
RUN
STOP
Signal name
PE
RxD/TxD-P
RTS (AG)
M5V2
P5V2
BATT
RxDT/TxD-N
-
Profibus designation
Protective earth
-
Data transfer line B
Control A
Data reference potential
Supply plus
-
Data transfer line A
-
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
Assigned to
RS 485
Yes
-
Yes
-
Yes
Yes
-
Yes
-