Siemens S5-135U/155U System Manual page 259

Pin Assignments
Shown in the following figure are the pin assignments of the 15-pin
of the SINEC L1
subminiature D-type connector in the front plate of the SINEC L1
Submodules submodule:
Pin
8 8
15 15
9
1 1
System Manual
C79000-G8576-C199-06
CPUs, Memory Cards, Memory Submodules, Interface Submodules
Designation
1 Housing/GND/GND
ext
2 – RxD
3 VPG + 5 V_
4 + 24 V from bus
5 24 V ground
6 + TxD
7 – TxD
8 Housing/GND/GND
ext
9 + RxD
10 24 V ground
11 20 mA
12 24 V ground
13 20 mA
14 VPG + 5 V_
15 24 V ground
: from partner to CPU
: from CPU to partner
Current Remarks
Direction
Current return
Current source, transmitter
Current source, receiver
5-119