@robski Yes it happens only when relay is called to be on not in standby Unit 4relay is connected to Port A with his supply(5V), but I using +24vdc for supplied m5dial

Hello @PPKOVY I put some I2C blocks together to control the 4 relays unit from M5Dial. You can find the example in the UIFlow2 cloud - Project Zone. It is called: M5Dial_4RelayUnit_UIFlow2.0.1 Thanks Felix