Modbus TCP App Server not working

[Open]

Hi Community,

I am new in using Modbus TCP Server App.

I have setup a simple boolean variable in ctrlX PLC datalayer

Modbus TCP Server:

Modbus TCP Client: 

However the value doesnt update the variable in plc is true in the client variable remain false, tried writing true doesnt work too. 

I tried using 2 ctrlX, 1 as modbus tcp client and another as modbus tcp server same issue.

Anyone had this issues? 

[AndreasL]

Does it make a difference if you change the PLC data type to a uint (the modbus registers are 16bit)? 

[Open]

Hi @AndreasL ,

Reading works now after changing the variable to uint. Now i want to write the variable it doesnt work.

PLC:

Modbus TCP Server:

Modbus TCP Client:

[AndreasL]

Can you write the variable from the datalayer? (So the symbol is readwrite)

Can you test with this master/client? 

https://github.com/ClassicDIY/ModbusTool

[Open]

Hi @AndreasL 

Yes i am able to write the variable from the datalayer:

I tried using the ModbusTool reading worked but writing doesnt work.

Read:

Write:

Write succeeded but values in PLC did not change

ctrlX Apps: