Datalogic DS6400 Reference Manual page 52

3
Terminal pins I34B are common to both inputs 3 and 4 and therefore these
inputs cannot be driven by opposite polarity devices.
NOTE
INPUT 3 - 4 CONNECTIONS USING DS6400 POWER (CBX500 Only)
INPUT 3 - 4 CONNECTIONS USING EXTERNAL POWER (CBX500 Only)
Figure 43 - PNP Input 3 - 4 Using External Power (i.e. PLC signal)
Figure 44 - NPN Input 3 - 4 Using External Power (i.e. PLC signal)
36
Power to
Input Device
Input Input Device
Signal Reference
Figure 41 - PNP Input 3 - 4 Using DS6400 Power
Power to
Input Device Signal
Input Device
Reference
Figure 42 - NPN Input 3 - 4 Using DS6400 Power
Input
Signal
External Device Input
Signal
Power Reference
DS6400 REFERENCE MANUAL
Input Device
Input
Input Device
External Device
Ground Reference