How to change production parameters based on workpiece carrier ID?

We have workpiece carriers moving from one station to another, on a line composed of about 35 stations. Each workpiece carrier may have a different recipe. To do this, we want to equip each station with a Siemens S7 PLC that would read the workpiece carrier RFID, and get from Ignition the recipe associated to the workpiece carrier ID in an SQL database. What would be a good way to do this in Ignition?

This would typically be a transaction group (possibly multiple-row in a block type group) set to DB->OPC direction. If you don’t have the SQL Bridge module, equivalent functionality can be scripted in a tag change event.

Consider doing this one station ahead and transferring the data in the PLC as part of the carrier movement logic. That minimizes/eliminates any DB delay before starting the machine cycle.

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