Siemens SIMATIC Rack PC 840 V2 Operating Instructions Manual page 106

Detailed descriptions
16.1 Motherboard
PROFIBUS/MPI interface, X400
The PROFIBUS/MPI socket has the following pinout:
PROFIBUS/MPI interface
PinNo.
1
2
3
4
5
6
7
8
9
Shield
Optional product feature
1
16-8
Abbreviations Meaning
– n.c.
– n.c.
LTG_B Signal line B of MPI module
RTS_AS RTSAS, control signal for received data stream.
The signal is "1" active when the directly
connected PLC is sending.
M5EXT M5EXT return line (GND) of the 5 V power
supply. The current load caused by an external
consumer connected between P5EXT and
M5EXT must not exceed the maximum of 90 mA.
P5 EXT P5EXT power supply (+5 V) of the 5 V power
supply. The current load caused by an external
consumer connected between P5EXT and
M5EXT must not exceed the maximum of 90 mA.
– n.c.
LTG_A Signal line A of MPI module
RTS_PG RTS output signal of the MPI module. The control
signal is "1" when the PG is sending.
on connector casing
Operating Instructions, Edition 05/2006, A5E00248055-04
Input /Output
–
–
Input/output
Input
Output
Output
–
Input/output
Output
SIMATIC Rack PC 840 V2