Siemens S5-135U/155U System Manual page 352

Digital Input/Output Modules
Connection for supply voltage,
jumpers and sensor supply in groups of 2 bytes
(16 inputs each)
Byte 0 + 1 1L+ Terminal 3
Byte 2 + 3 y 2L+ Terminal 24
Type of
Sensor
NAMUR Connect to L+
(24 V supply)
CMOS
TTL
The types of sensor can be arbitrarily mixed in groups of 16 inputs.
With CMOS TTL sensors, open inputs are at logic 1 (LED is lit).
8-40
1LH+ Terminal 12
2LH+ Terminal 33
Output for sensor
supply
open Connect to 5 to 15 V
supply
open Connect to 5 V supply
1LH– Terminal 22
2LH– Terminal 23
Jumper to L–
Terminal 21
open
open
System Manual
C79000-G8576-C199-06