Classic example of a FIFO (First in First Out) Load and Unload. <br />
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Application was bottles coming down a conveyor system at a "variable" rate and sporadic. Sometime 10 bottles would be grouped together all in single file, others they would be spaced out oneisy, twoisy.<br />
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A photoeye was used in a vision cell up stream, this photo triggered the vision system and loaded the FIFO at the same time.<br />
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A photoeye was placed downstream next to an air blow off nozzle. This created a "zone" at which you could load and unload the FIFO and keep track of bad bottle in-between your zone. Bottle QTY could vary between the vision photoeye and reject photoeye.<br />
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The vision system was triggered and part status was loaded into N7:0. A 1 means good part, a 2 means bad part. The 1 or a 2 was loaded into a FIFO and placed into N7:1 at the reject air station. If the FIFO status equals 1 at reject it was allowed to pass if equal to 2, the air nozzle was turned on under a timed blow off.<br />
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This was a field installed retrofit project that involved a 10 point Micrologix 1000 that cost $72.00, 4 Keyence Vision systems, and 2 Banner EZ-Beam photoeyes. Cake work.