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I had the same problem that I needed to read and write to the same variable from an HMI using ModbusTCP.
But unfortunately, it seems that this is not possible anymore in Codesys 3.5.
In my solution, i changed the driver to OPC UA, but this might nog be possible for you.
Jesper
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I have a Wago PLC and would like to connect with modbus TCP.
It is possible to create READ/WRITE variable?
Gianni
I use the function FC23 but i can't use the same variable in read and write
Gianni
Hi Poix.
I had the same problem that I needed to read and write to the same variable from an HMI using ModbusTCP.
But unfortunately, it seems that this is not possible anymore in Codesys 3.5.
In my solution, i changed the driver to OPC UA, but this might nog be possible for you.
Jesper
Thank's for your replay, but I have to connect to a Wago PLC.
Gianni
May be possible to use Network Variable instead of MB protocol. CoDeSys doesnt handle RW variables in MB registers any longer.