Siemens SIMATIC Panel PC 870 Equipment Manual page 106

Hardware Information
MPI/DP port, X400
The MPI/DP port on the computer unit is assigned as follows:
Connect
or
1
2
3
4
1
6
5
6
9
5
7
8
9
Shield
Note
The current load by an external load connected between P5EXT and M5EXT may be
max. 90 mA.
7-12
Pin Short
No. Name
NC Not Connected
NC Not Connected
LTG_B Signal lead B of MPI module
RTS_A RTSAS, control signal for received data
S stream. The signal is '1' active when the
directly connected AS is sending.
M5EXT M5EXT return conductor (GND) of 5 V
supply.
P5 EXT P5EXT supply (+5 V) of 5 V supply.
NC Not Connected
LTG_A Signal lead A of MPI module
RTS_P RTS output signal of the MPI module. The
G signal is '1' when the PU is sending.
On connector casing
SIMATIC Panel PC 870 Computing Unit, Equipment Manual
Meaning
Release 11/02
Input/
Output
-
-
Input/
Output
Input
Output Output
-
Input/
Output
Output