Allen-Bradley 80DLB-8100 Programmable Counter

The Allen-Bradley 80DLB-8100 Programmable Counter (Model A) is a PhotoSwitch-based counting module designed to tally discrete events detected by a photointerrupter sensor in industrial automation. Sold as a Photoswitch counter, FK variant, it integrates with Rockwell Automation control systems to provide programmable counting functionality that can trigger a subsequent control action once a preset count is reached. Common applications include counting parts on conveyors, batch counting in manufacturing lines, and line monitoring where optical sensing registers every item as it passes a fixed point. The unit is described in listings as a programmable counter with a dedicated programming menu for setup and calibration. As with many refurbished or used Allen-Bradley PhotoSwitch counters, buyers should confirm compatibility with their AB PLC and ensure proper wiring and sensor alignment for reliable operation. Physical form and installation considerations may vary by batch, and many listings note refurbish status when marketing this model.