Banner Engineering Multi-Beam® PBP 3/4-Wire Power Block, Photoelectric Sensor, 10 to 30 VDC, PNP Output

PBP: similar to model PBT, except that it provides a PNP sourcing type output transistor. Sourcing outputs are frequently required when interfacing to logic systems and programmable logic controllers (PLCs) which require a positive source of dc voltage to generate an input condition. This type of interface may also be accomplished by using PBT with a "pull-up" resistor installed between terminals #1 and #3.