it depends what do you mean by "available in the PLC", the app PLC was running for sure. I made the change in my communication check, I used the same item for HMI -> PLC ( not sure this is the way..). The thing is that the error comes randomly, so I have to wait for another error. Ps : one colleague of mine told me it could come from the project name that is loaded in the sever, sometimes the server takes the old one if the it was the same name. So we save the project on our PC, we delete it from the server, we change the name of the project, then we load it again in the server... I keep you in touch.
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