We've had a few apps where we're retrofitting bar code readers to sheet feeding machines. There's no real way to get 1 trigger signal only when a sheet is being fed into the machine. The best signal we've found is the sheet detection sensor - but it gives a signal on both the leading and trailing edge. So you get a read then a noread.For about $120 w/display Allen Bradley has a little Micro810 PLC that we can use to handle the extra trigger signal.
This setup will now only trigger the reader 1 time and only when a sheet is present. The usual code matching features are built into the reader. We typically use the Mini Hawk or the QX Hawk in this application. Contact us for more information.
barcode checking sheet feeder
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