FIFO Scan Studio5000

[PLC_GUY23]

I am not sure if this is possible but if there is a way, you guys would be the ones to know. I am currently working on a project where we are using a Barcode Scanner that sends a String from the Scanner to the PLC. We are then taking that String to a COP then to a FIFO to store the Barcode String. We currently store up to 3000 Barcode Strings in the FIFO and reset the FIFO every 24 hours. My question for you all wise and talented individuals is, is there a way to scan the Strings already loaded into the FIFO for duplicate Barcode Strings every time a new String is added into the FIFO? See image for reference.

Screen shots of examples would be much appreciated for better understanding!

Thanks guys!!!

 

[JankyPLC]

Sounds like FSC (File Search Compare) instruction should do what you're wanting to do.

 

[drbitboy]

Screen shots of examples would be much appreciated for better understanding!

Example 2 starting here.

 

[PLC_GUY23]

Sounds like FSC (File Search Compare) instruction should do what you're wanting to do.

This is what I came up with but does not appear to be correct

 

[clintm]

You need to use a unique Control tag for your FSC. Reusing FIFO_Control is probably going to mess up your indexing for the other FIFO instructions.
Your expression syntax needs editing. Check the link Dr sent.

 

[PLC_GUY23]

Okay so with a new control tag say "FIFO_Control2" What should my expression look like using the information I provided?

 

[drbitboy]

Look at that link again. Your case is essentially the same; only the Control parameter, the Length parameter, and the two tag names in the expression parameter, are different.

 

[OkiePC]

Look at that link again. Your case is essentially the same; only the Control parameter, the Length parameter, and the two tag names in the expression parameter, are different.

Dang, I clicked that link and now I have 3 copies of the entire 861 page Logix 5000 Controllers General Instructions manual.