The feeding system adopts the master-slave structure. The industrial computer is used as the upper host, and Siemens PLC, inverter and weighing instrument are used as the lower slave. The host is in the dominant position to realize the communication management and control of each slave computer. The RS-232 asynchronous communication interface of the industrial computer is connected to the PLC after the level conversion, forming a physical channel for the communication between the upper and lower computers. Another RS-232 port of the host is connected to the communication port of the weighing instrument to form a second physical channel. The host computer uses polling mode to communicate with the slave station one by one. The upper computer transmits the result of task planning to the PLC. In the process of PLC control, the upper computer uses the upper computer connection command to monitor the operating status and data area content of the lower computer, reads the internal status of the PLC and the real-time data of the weighing instrument in real time, and displays it on the upper computer.

The feeding system is composed of industrial control computer, PLC, industrial weighing instrument, frequency converter, vibration motor, mixer, weighing module, screw conveyor and so on. The batching control system is composed of programmable controller, solenoid valve, regulating valve and so on. In the control of the system, the analog control method and the switching control method are involved. The control of motor start and stop signals belongs to switching quantity control, while the control of liquid flow belongs to analog quantity control. The system adopts a programmable controller integrating analog quantity and switching quantity. When the flow signal is collected by the system, it is converted into current signal and sent to the programmable controller, and the programmable controller completes the corresponding operation according to the user's requirements. Responsible for receiving and storing liquids; Distribution and mixing of different liquids and deposited liquids; Dispense to intermittent or continuous batching tanks.

The Batching system includes two parts: operation management and system management. Operation management has the functions of system monitoring, fault diagnosis, equipment management, production safety management, system communication and operation guidance. The monitoring function of the system includes data collection, processing and monitoring of the production process, and the fault diagnosis function predicts the fault in real time, so as to find the fault in the production in time, such as the prediction and judgment of the fault phenomenon such as the transmission pipeline cutting, the reaction kettle "plugging". The equipment management function alarms the equipment failure, manages the maintenance of the equipment, helps to make maintenance plans, and ensures the safe operation of the equipment. Production safety management features include interlocking protection between important equipment, such as in order to avoid the occurrence of "clogging" phenomenon in the reactor, when the reactor vibration is below a certain value, the interlocking protection function will automatically stop feeding. The production safety management function also includes functions such as confirmation before performing critical operations, such as requiring operator confirmation before starting important equipment such as frequency converters and pumps to avoid production accidents. System communication function to achieve the communication between each control subsystem and all levels of computer network, for example, in order to better monitor and manage the entire batching production process, three monitoring computers are configured in the machine operation room, slot operation room and duty room, three computers can communicate with the entire DCS system to complete the corresponding functions. The operation guidance function is that the system judges the current production status and operating conditions according to the collected data and manual input information, and gives the corresponding operation guidance.