Read the statement by Michael Teeuw here.
multiple module instances overwrites itself values
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 Ok other question. 
 If i setup a module twice in the config, do they share the variables from the code?
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 Any news here? 
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 @DazDavid nope 
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 Would it work if u give them names like MMM-FHEM1 and MMM-FHEM2? Cause if u add two instances with the same name in the config i can imagine, that he will read the first value and overwrites them in the second instance. Like var variable = 1; 
 var variable = 2;Output would be 2. 
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 @bobbob601 thx for the answer. Do you have a example how to write a module with multi-instace support? 
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 Having the same problem with my module… A theoretical solution could be to make node_helper multi instance aware by appending some identifier to the notification unique to the instance: ie GET_WEATHER_001… The helper triggers on GET_WEATHER and builds an array with the different notifications and payloads. It then periodically runs through the array getting the appropriate requests and sending out notifications like WEATHER_001 with the specific payload. Haven’t built it yet though… 
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 @bobbob601 I got it working by passing a unique ID to the node helper and passing it back from the node helper. https://github.com/trgraglia/MMM-MVG-LocalTransport Hope this helps. 
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