The weighing and Filling machine consists of a two-level computer control network composed of programmable controller and Electronic scale, which is connected to the weighing instrument, control computer, PLC, inverter and other equipment with high intelligence and fast processing speed through the field bus. PLC is mainly responsible for the automatic filling machine fault detection, display and alarm, and at the same time to the inverter output signal, inverter to complete the adjustment point electronic scale speed role. The most widely used PID regulation in industrial control is used for actual flow control. According to the flow deviation, the control quantity is calculated by using proportion, integral and differential. The speed of electronic scale is adjusted by frequency converter, and the quantity is adjusted so that it is equal to the set value.

The hardware system of measuring filling machine consists of base station and filling electronic scale. Filling electronic scale is responsible for the reading of the bar code of the filling barrel, the processing of the filling process and the display of information, and needs to transmit the filling record to the base station. The base station is responsible for the reception and forwarding of data, that is, the data received from the communication module is put on the bus, and the data received by the metering module is sent out through the communication module, and the output frequency of the inverter is controlled to change the speed of the servo motor to slow loading. When the weight of the material reaches the slow loading weight of the weighing module, the sensor will give the signal of the end of slow loading, the board will close and the control motor will stop. After the weighing instrument gives the weighing end signal, the packaging drum is loosened and transported forward, and the whole process is completed.