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heron8888

Barcode module

10 posts in this topic

I am looking for a device that will receive information from a barcode scanner, compare it to say 300 stored strings and output job number to an slc or micrologix, any help would be appreciated

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There's a multitude of barcode scanners. Are you looking for something that's portable or fixed? Ethernet or Serial? There's plenty of good choices that are just a google search away. As far as outputting the barcode vs a database and sending the resulting job number to the PLC, it would probably be easier to just take the barcode value directly from the scanner and do the lookup in the PLC. Use an ASR instruction if the value from the barcode scanner is a string. Use an EQU instruction if the value from the scanner is a DINT. Edited by MrAutomation

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I have done it like this at present, but cant fit more than 150 or so strings in memory, even doing two compares in each string I dont have enough memory, even less with the micrologix

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I've never heard of a module like that. I would tend to try to do that in the PLC. What does the barcode look like? Could you run it through an algorithm to produce an unique integer as the job identifier instead of using a lookup table?

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I'd use a vision system or bar code reader and then use that bar code as my ID number, not look it up in a table.

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I have tried converting barcode strings to integers and then comparing them but it is very messy, I have found a red lion unit with crimson software that I can type all the codes into then compare scanner input for match and set result direct to plc example has 16 jobs so will have to alter program and try

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Yes, doing it in the PLC can be messy. I hadn't thought of using a Red Lion, as they aren't specifically barcode modules, but they would certainly work!

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The DV-90 Unit from Keyence will do what you want (up to 900 stored references), but pretty sure you need to use their scanner and not certain of cost compared to doing it with the PLC.

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Ok thanks I will look at keyence unit

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Hi, Sparky. I wonder have you ever worked it out? How did it work for you?

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