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Weighing sensors, signal converters, PLC control systems in the production field, the quality of the products and the stability of the production process have the most direct relationship with the precision of the raw materials, and the design of the PLC's weighing and batching control system can not only be Satisfy its precision requirements, but also conducive to the improvement of production efficiency and product quality, fundamentally realize the benefits of the enterprise. Therefore, it is of great value and significance to discuss the design of PLC weighing and batching control system.
The design principle of the system The PLC control system of the weighing batching control system uses a relatively simple method and principle, and has a strong adaptability. At the time of design, it is mainly performed through an analog regulator, combined with relevant digital operations to determine its associated setpoint. The specific calculation method is set according to the above procedure. When the system issues an instruction, if the input value is PVnf When the setting value is large, then it is necessary to perform the above program setting through positive action execution. When the system issues an instruction, the PID algorithm is executed. Otherwise, the PID algorithm is executed through the reverse action.
System design The PLC control system of the weighing batching control system can be used in the control system of automatic weighing and dosing equipment in various industries (such as cement, steel, glass, coal, pharmaceutical, feed, etc.), usually with software with automatic batching algorithm. Computer (microcomputer) components, the application of the system, can not only save a lot of labor, improve business productivity, but also can bring huge benefits for the company's production. In addition, in the actual production and application, it is also possible to customize and design the corresponding control system according to the ingredients of different materials, to provide a complete solution for the development of the enterprise and to meet the development needs of the enterprise. 
Optimize system design 1. Optimize program settings Since the operation of the PLC is mainly realized through a program, and combined with various sensors, the entire system is fully monitored. Once the system fails, it is necessary to carefully determine the differences and differences between the input points and the normal ones. , Or use programming software to monitor, in order to determine that can not be ingredients, PLC normal operation, the host computer can read/write data, PLC output point output.
2. Optimization of the system module First, the design of the system weight detection module requires the use of a pressure sensor for detection. The main output voltage range is between 0 and 21.6 mV. The A/D conversion mode is used to control the output resistance at 351. Through the AD623 chip, the signal needed by the system is amplified 50 times. Secondly, the design of the data conversion function module should be converted by the inverter to the data calculated by the PLC to make it an analog signal and control the rotating speed of the feeding motor. Finally, the parameter detection module passes the 485 interface while the motor is running, converts the relevant power, current, and efficiency data, and transmits it to the host computer and the PLC.
Shenzhen Youzhongli Technology Co., Ltd. specializes in supplying batching controllers, quantitative packaging controllers, and belt scale display controllers. The high-precision, high-efficiency meter can meet the weighing batching system for various occasions. The products are widely used in various industries. The weighing scales, quantitative packaging scales, electronic belt scales and other automated weighing detection products.
In conclusion, the PLC-based weighing and feeding control system mainly uses the PLC as the control center, configures relevant operating procedures, ensures the automatic operation of the system, and realizes automatic monitoring of the system. In general, the overall system is a closed-loop control, using programming methods, combined with functional expansion, optimized process design and interface design
Application of weighing batching control system in PLC control system
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