The core part of the weighing module is CPU, which communicates with the modules installed on the rack by using the backplane bus of the rack. On the premise of hardware self-inspection, the module installation inspection and program scanning are carried out, and the I/O module values are stored and updated regularly. The analog module is used to poll each module of the equipment and constantly update each channel, and the results are directly input and output after the program execution. Even if the HMI fails, the normal operation of the system will not be affected. At the same time, the weighing sensor has the functions of interlocking control of itself and the surrounding system, controlling the running state of the motor, various feeders, baffles, charging doors, measuring hoppers and other components in the control system, detecting the running state of the state sensor, monitoring the field situation in real time and giving an alarm at any time, transmitting the running state of the system to the upper computer in time and accepting the supervision of the upper computer all the time.

Weighing module Taking a typical chemical reaction kettle as an example, three pressure weighing modules installed at the bottom of the reaction kettle transmit the weight signal of the kettle body to the junction box. Each weighing module signal is connected in parallel in the junction box, and the angle difference can be adjusted according to the load of each weighing module, and the collected weight signal is sent to the weighing end or weight transmitter. The weighing terminal or weight transmitter processes the weight signal into corresponding weight data.

The weighing module is elastically deformed under the action of external force, so that the resistance strain gauge attached to its surface is also deformed. After the deformation of the resistance strain gauge, the resistance value will change, and then this positive change will be converted into voltage by the corresponding measuring circuit, thus completing the process of converting external force into electrical signal. Among them, the resistance strain gauge is a strain gauge by mechanically distributing an electric limiting wire on a substrate made of organic materials.