# Assistance Needed for Tag Value Transfer Between Schneider M340 and AB Micrologix PLC in Ignition 7.6.6

**URL:** <https://forum.inductiveautomation.com/t/assistance-needed-for-tag-value-transfer-between-schneider-m340-and-ab-micrologix-plc-in-ignition-7-6-6/99212>\
**Category:** Ignition\
**Tags:** vision, scripting\
**Created:** [November 28, 2024, 2:53am UTC](https://forum.inductiveautomation.com/t/assistance-needed-for-tag-value-transfer-between-schneider-m340-and-ab-micrologix-plc-in-ignition-7-6-6/99212 "2024-11-28T02:53:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sanjiv\_Anto](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@Sanjiv\_Anto](https://forum.inductiveautomation.com/u/Sanjiv_Anto)\
**Post date:** [November 28, 2024, 2:53am UTC](https://forum.inductiveautomation.com/t/assistance-needed-for-tag-value-transfer-between-schneider-m340-and-ab-micrologix-plc-in-ignition-7-6-6/99212/1 "2024-11-28T02:53:47Z")

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I am currently working on an older Ignition SCADA system, version 7.6.6. The system has two devices connected: a Schneider M340 PLC and an Allen-Bradley Micrologix PLC.

I need to read the value of a tag from the Schneider PLC and write it to a tag in the Micrologix PLC whenever the Schneider tag value changes. Is there a way to accomplish this in Ignition version 7.6.6?

Apologies if this is a basic question—I'm still learning this SCADA system. Any guidance would be greatly appreciated!

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [November 28, 2024, 3:04am UTC](https://forum.inductiveautomation.com/t/assistance-needed-for-tag-value-transfer-between-schneider-m340-and-ab-micrologix-plc-in-ignition-7-6-6/99212/2 "2024-11-28T03:04:30Z")

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The easiest thing to do would be a gateway tag change event script that watched the Schneider tag for changes and then wrote it to the MLX tag.

Sorry, I don't have any documentation or user manual I can link to for such an old version.

In the current version it would be this: [Gateway Event Scripts | Ignition User Manual](https://docs.inductiveautomation.com/docs/8.1/platform/scripting/scripting-in-ignition/gateway-event-scripts#tag-change-scripts)