PLC automatic batching system for steel and nonferrous metal industry

PLC has many years of application experience in steel, nonferrous metals, cement and other industries. The material batching system in these industries is very large, usually reaching the scale of ten to dozens of units. In order to integrate the batching control system into the PLC control system, as early as the 1980s, the analog input module and digital input module in the PLC I/O module were used to input the signals of the weighing sensor and the speed sensor. The calculation function and control function are completed in the PLC controller, and then the control signal is output through the analog output module.
Subsequently, some PLC manufacturers introduced weighing modules for weighing products in their I/O module products. It can not only provide stable power supply for the load cell and speed sensor signals, but also provide analog input. I/O channels required for weighing process (such as analog input channel, switch input channel and analog output channel) are integrated in the weighing module, and supporting weighing software is also provided. For example, the FTC and WP241 weighing modules introduced by Siemens are designed for continuous automatic scales. In the continuous batching system of the FTC weighing module used for the quantitative belt scale, the input signals of the weighing sensor and the speed sensor on the fixed belt scale are directly connected to the FTC weighing module. The weighing module performs calculation processing (including AD conversion, filtering, etc.), and then directly sends the PID control of the CPU of S7-300 PLC through the control function of PLC, and then outputs 4? When 20mA control signal (such as the signal sent to the frequency converter) is sent to the weighing module, the display can view the weighing process parameters and operate like an independent controller.
Rongxin Technology Co., Ltd. is specialized in the production of batching systems, automatic batching systems, belt scales, batching scales, coal blenders and other batching systems and supporting equipment in the whole industry. The company always pursues to create perfect products, users first, and use a perfect after-sales service system to bring customers reassuring products.