Siemens SIMATIC PANEL PC 877 - Page 202

Detailed descriptions
17.1 Motherboard
SIMATIC Panel PC 877
17-10 Operating instructions, Release 07/2006, A5E00877780-01
PROFIBUS/MPI interface, X400
The PROFIBUS/MPI socket has the following pinout:
PROFIBUS/MPI interface
1)
PinNo. Abbreviation Meaning Input/Output
1 – Not assigned –
2 – Not assigned –
3 LTG_B Signal line B of MPI module Input/output
4 RTS_AS RTSAS, control signal for received data
stream. The signal is "1" active when the
directly connected PLC is sending.
Input
5 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.
Output
6 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.
Output
7 – Not assigned –
8 LTG_A Signal line A of MPI module Input/output
9 RTS_PG RTS output signal of the MPI module. The
control signal is "1" when the PG is sending.
Output
Shieldin
g
on connector casing
1)
Optional product feature