Arduino based PLC with modbus USB protocol - First working program with Codesys and Arduino 

Wow, I have been looking for this. Thanks.

Very good, you should do more of this. 👍

Hey, I am having some problems, when testing the QModbus sketch it says did not receive data from the slave.

I can't seem to get any modbus communication with my pc with UNO R4, any suggestions?

Great Video, Thank you. I'm having problems adding the timers I get an error C0077 Unknow Type: TON; any Ideas ?

fascinating Arduino Modbus video. do you have a video on the ESP32 Modbus master rs485 rtu using serial 02 reading input 30001 analog? thanks a lot.

hello i got a problem on modbus slave with no no response timeout, do you have a solution?

I have a little problem. Everything works, but the I / O state changes from time to time. Arduino is on and the output changes its state to 1 and 0. Sometimes every few seconds, sometimes every few minutes. I checked on arduino uno and on mega. Same... :/