Posted 10 Jun 2016 Hallo everybody, I am using Modicon TM221CE24T in combination with HMI Weintek TM8071iE. I am trying to read and write some %MW from and on this HMI. Do I need to use, %Read_Var and %Write_Var function block to do this.I have already set numeric objects with corresponding adresses. Connection between HMI and PLC is by Ethernet. Share this post Link to post Share on other sites