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S7-USB user manual
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2019/10/05 05:07
Pin No. Notation
Designation
Direction (of cable)
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).
