How to use photoelectric sensor for counting?

slot type photoelectric sensor
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1PCS NEW FOR MEIJIDENKI Small slot type photoelectric sensor SL-305NA-E ; Item Number 175019513604 ; Brand Unbranded ; Accurate description ; Reasonable

EE-SX674P- Slot-type Photomicrosensor with connector or pre-wired models · Material: PVC · Luminous method: Non-modulated · Sensing method: Through-beam type

slot planet erfahrungsbericht Photoelectric Sensors · Fiber Optic Amplifiers · Fiber Optics · Slot, Label, Edge, and Area Detection Sensors S4B Series Heavy-Duty Type 4 Safety Light

slot dana 77 Type: Slot Type Photoelectric Sensor Output Signal Type: Switching Type Production Process: Integration Material: Plastic Feature: Conductor F&C Sensing