Hi,Would be nice to know what motors are involved and exactly what sensor you have. Have the sensor sense the box and stop the conveyor belt drive. That's about it since you provided next to no information.
I would not of thought that necessary, there is typically nothing mysterious about PLC inputs, typically a sink or source selectable opto input .Now I'm no expert on this subject but we used to use IR emitters and detectors to do this when I built sawmill equipment.
Now of course ours were hooked to a PLC And I might be mistaken but I don't think you have to use a PLC to have them work.
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