Electronic scales to reach the balance of the analog electronic scale sensor signal through the AD code for the digital code to the microcontroller, the use of electronic scale program to correct the actual weight value to be displayed by the electronic scale single-chip output digital signal, after the DA converted to analog Signal through the op amp circuit into a linear signal 4 ~ 20mA or 0-10V. Electronic scale analog output connection PLC control weighing, industrial electronic weighing analog output, connected to the host computer PLC effective control of the production process.