Echo Tag Value back to OPC tag

[pturmel]

You mean send incoming values on one tag (OPC, presumably) to a different OPC tag?

Perhaps the techniques here will help you:

Modbus Slave/Server to Generate Read Only Tags

I've create a generic "Modbus Publish" script that eliminates the need for a second set of tags. I've publicly posted it here: https://www.automation-pros.com/ignition/modbusPublish.py It requires the "Queue Utility" script posted here: https://www.automation-pros.com/ignition/queueUtil.py and described over here: Both scripts rely on my Integration Toolkit's globalVarMap() script function, but you can rework that (not quite 1:1) to use system.util.getGlobals() if you must. (Not recomme…

(Whatever you do, don't use system.tag.writeBlocking() or system.opc.writeValues() in a tag's valueChange event.)