Looks great. Can you send the program please?

I belive it's something wrong with the VW addresses.

I added a second Input. But when I write VW2 it also changes the value of VW1 from 0 to 256.

Is it correct to have the 2 words length in modbus table? And should the Id be equal 1?

Ok I changed that. But still not working.

I also updated the sending interval to 2 seconds. On the modbus relay I can see the RXD and TXD Leds every 2 seconds. So it seams the connection works.

Is there another way to Send FF00 instead of sending -256?

Thats the configuration of the modbus relais.

ixo65

@ AutoGen_97368,

I have make a test with a LOGO! 8.FS4 and a modbus server simulation program.

See attached screen video.

 In your simulation you are using Mode 06 - write single register. Thta did not work in my Testtool Modbus Poll. If I use mode 05 - write single coil in Modbus poll it's working.

How can I understand which one is used by Logo Modbus comunication?

ixo65

Try this ...

 Perfect!!! That works.

Thank you all for your great help.

In attachment you can find the settings and live datatable.