G3
Series
PROFIBUS
‐
DP
Technical
Manual
Page
47
TDG3PTTM1-2EN
02/09
Subject to change without notice
www.numatics.com/g3
I/O Module(s) Wiring Diagrams
NPN/PNP Definitions
There is confusion between NPN, PNP, Sinking and Sourcing terminologies. Basically, if one is using sensors that provide
a 24 VDC signal to the input module then a PNP input module type will be required. If one is using a sensor that supplies a
0 VDC signal to the input module then an NPN input module type will be required.
NPN Descriptions
Sinking
Switching Negative
Positive Common
PNP Descriptions
Sourcing
Switching Positive
Negative Common
NPN (Sinking) Input Connection
PNP (Sourcing) Input Connection
LOAD
LOAD
Mechanical Sensor Type
Electronic Sensor Type
2
4
3
1
2
4
3
1
Mechanical Sensor Type
Electronic Sensor Type
2
4
3
1
2
4
3
1