Datalogic DS8100A Reference Manual page 44

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 DS8100A POWER (CBX500 Only)
INPUT 3 - 4 CONNECTIONS USING EXTERNAL POWER (CBX500 Only)
Figure 34 - PNP Input 3 - 4 Using External Power (i.e. PLC signal)
Figure 35 - NPN Input 3 - 4 Using External Power (i.e. PLC signal)
30
Power to
Input Device
Input Input Device
Signal Reference
Figure 32 - PNP Input 3 - 4 Using DS8100A Power
Power to
Input Device
Input Device
Reference
Figure 33 - NPN Input 3 - 4 Using DS8100A Power
Input
Signal
External Device
Power Reference
DS8100A REFERENCE MANUAL
Input Device
Input
Signal
Input Device
External Device
Ground Reference
Input
Signal