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MPI-USB user manual
91 / 93
2022/01/21 01:28
Interfaces:
to the PLC: PPI/MPI/Profibus interface: 9,6 KBd - 12 MBd
to the PD/PC: USB 1.1 cable type A
Galvanic separation:
1000V PPI/MPI/Profibus to the PC Operating
temperature:
5 - 55°C
Case:
ABS-plastic case
Dimensions:
146 x 41 x 29 mm
11.1 Pinning (USB) PC
Pin No. Short form Description
Direction (cable – view)
1
Vcc
Power supply (DC) In
2
D–
Data line–
BiDi
3
D+
Data line+
BiDi
4
GND
Ground
In
Important:
Please do not lengthen this side, this side also supports the 5V/DC power supply (max. cable length are 5
meters)
A longer cable would decrease the quality of the signal on the bus and may cause several errors in the
transmission!
11.2 Pin assignment
Pin No. Notation Signalname
Direction (of cable)
1
NC
Not Connected
2
M24V
Ground of the 24V
In
3
Ltg_B
Data line B
BiDir
4
RTS-AS
Request to Send from the PLC In
5
M5V
Ground of the 5V
IN
6
P5V
5V output
Out
7
P24V
24V Supply input
IN
8
Ltg_A
Data line A
BiDi
9
RTS-PG
Request to Send to the PLC
Out
Note
The shield is attached with the MPI/PPI connector via the shield of the adapter casing. To find directly
attended PLC´s , RTS-AS and M5V must be connected in the cable. P5V means a output of the cable and
works only as an output for a bus-termination with resistors. This 5V output doesn’t drive any load and
have a 100R resistor inside his direction.
observe:
Don’t lengthen the connection by a 1:1 cable to the PLC, because there are 24V and 5V inside of the cable.
The quality of the bus-signal will be risen down!
To lengthen the connection, please use a MPI-NETZ-Adapter and connect only the signals Ltg_A and Ltg_B
1:1 and the shield at both sides of the metal-casing at the SUB-D connector
For an extension of the cable please supply the cable with external power and only prolong the signals
Ltg_A and Ltg_B 1:1. Connect the shield on the SUB-D connector, possibly include a termination resistors
(on the bus-END).