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What causes a 'Transfer error: negative UMAS response' when using the Unity Loader to transfer a project to an M340 PLC?

This error means that the M340 project was last Built with Control Expert (formerly Unity Pro) in Simulation Mode rather than Standard Mode. Open the M340 project with Control Expert and Rebuild the project in Standard Mode.

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Modicon M340
EcoStruxure™ Control Expert
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