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Multiple Machine QMH


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Hi,

I'm working on a project to connect and interact with a cell of machines (8 PLC aprox) with datasocket, the app consist in a simple communication to poll a trigger, read and search the partnumber and retrieve data to PLC from a SQL database. I use QMH to start this project, and I made a MHL with the functionality of ONE machine (PLC and SQL communication, and a few messages to UI loop).

This loop I called "Station Handler" is initialized with a configuration file which haves unique information to run each machine (CSV file with tags and parameters of SQL), I convert this loop in a SubVI and configured to be < Preallocated Clone Reentrant >, and I configure the datasocket subvis that i made to be reentrant also.

When I run the application it works fine with the PLC about a couple of cycles (write/read), also I can use the two PLC I currently have to do tests, but suddenly, the "Station Handler" vi dont read ok the trigger tag, i have it in true and labview never read it. Is not a problem of network or OPC because I already open a OPC test client and read ok the value of the trigger tag.

I will appreciate if anyone can help me... and sorry for the english if I dont explain myself enough haha

Also I'm open if there is a better way to achieve this, and QMH maybe wasn't the answer...

 

Top level VI

imagen.png.a5151642b76954ea7396c27ffb01a812.png

 

Station Handler loop in Poll trigger state

imagen.png.0f1a46cade5c0ed5db4ff705d5118ff2.png

 

Poll trigger VI

imagen.png.fe4a37d1cc8cb83ea6c9f0cbe89dffc5.png

 

 

Thanks in advance!

 

 

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