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    How to create and run multiple communication function block in M221 PLC?

    If you trigger the "Execute" of the communication function blocks at the same time, there will be only one of them working, the others just come up with a fault code comm 2500 and error code 11. The point is you can not trigger multiple communication function blocks at the same time. Set up a timer and run the Read_Var or Write_Var at different period of time is the best way to do it.  Check the attached sample program file for details. 

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