Hello,
we tested the Modbus TCP App with the S20-ETH-BK. What I can see in your screenshot and your module you made a mistake. With the S20-DIDO-8/1 you will need just one register for the Inputs and another for the Outputs. The available registers you can find at the bus couplers webpage.
When you use FC4 with register 8000 , quantity 1 and for FC16 with register 9000 or 9001 (check the webpage of BK), quantity 1 it should work.
If it's not working, please send me a PN.
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