"Failed to open connection to PLC" (M241 & HMIG3U (HMIDT542)

5 posts in this topic


I've been having a problem with my Schneider setup, and I can't seem to figure out the problem. I'm using Machine Expert Logic Builder and Vijeo 6.2, and I can't seem to download to my PLC. I can download to my HMI just fine, but my HMI comes back with the message as mentioned in the title. Also when I perform a full download, machine expert comes up with the message "Could not connect to the device for item "xx", selected target system "PLC name" is different from the connected device "HMI name".

The weirdest thing is that machine expert shows my PLC just fine, but doesn't show my HMI.

I have no idea what to do, as I feel like I've tried everything.

The IP range is fine, subnet is fine. The driver in IO manager in Vijeo has the PLC nodename in it, so that shouldn't be the problem either.

Does anyone know what to do in a situation like this?

Thank you in advance!

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I dont understand how you can use vijeo designer for a HMIG3U. I thought you can only use Vijeo XD or Ecostructure Opertator terminal expert for that type of screen

As stated in this Schneider FAQ

Can SoMachine controller communicate to a HMI program with Vijeo XD V3.0

Published date: 15 November 2018


How do I setup communication between the Controller and HMI and link the variables.

Product Line:
M238, M241, M251, M258 

SoMachine V4.3
Vijeo XD 3.0

Vijeo XD V3.0 is not integrated with SoMachine V4.3
You have to create a separate SoMachine application for the M251 controller and a separate Vijeo XD V3.0 application for the Magelis HMI.

In Vijeo XD, use the SoMachine Network driver under Schneider Electric.  Copy the Node name from the SoMachine application.
Create a symbol link and browse for the application name XML file to import the tags from SoMachine to Vijeo XD.  This file is created during a download in SoMachine.

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Hmm, that might well be the case - didn't think of that. I'll have to try and do it this way.
Thank you very much for your reply!

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I'm quite sure that not using Vijeo XD isn't the problem.
When I add the HMI in Machine Expert it automatically opens up Vijeo Designer.
Also I'm able to make a program for the HMI and download it via Vijeo Designer.

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Ok my bad then. Machine expert is the latest version of somachine so I thought the same would apply but they obviously incorporated this hmi into it.

Its just that in my stand alone vijeo designer I cant get that model.....anyways will dig around a bit more

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