Weighing mixing equipment through the organic combination of computer technology and traditional relay control system, in the batting process, PLC is mainly responsible for receiving external switching signals, in order to judge the current system operating state, and output a variety of control signals, control contactor, relay, solenoid valve and other components for the corresponding action. According to the specific batching process, at the beginning of the batching, the motor runs normally, the feeding system is fed at a high speed, and the PLC point control mode is used when the weight of the material is close to the target value, so as to ensure the requirements of the measurement accuracy of the material.
020-34563445The feeding system adopts Siemens S7 series PLC and CPU uses high performance 315-2DP type processor to ensure the stability and rapidity of the dosing control system. The basic automation part includes weighing and mixing equipment. The weighing and mixing machine consists of one S7-300 PLC. The master station and each remote I0 station use PROFIBUS communication network to ensure reliable, timely and high-speed communication of the control system. The weighing and mixing machine is also connected to the process batching level computer to receive commands and management information from the process batching level and to transmit real-time operating data from the on-site unit upwards.
The I0 station is directly connected with all kinds of devices on site for monitoring and control, which accomplishes the collection and control output of signals for equipment self-locking, starting, stopping, etc., as well as the dosage adjustment of all kinds of materials in the ground bin. It completes the acquisition and control output of the signals of self-locking, starting and stopping of the spiral scale, Feeder and other equipment, as well as the dosage adjustment of all kinds of materials in the ash storage tank.
The platform of Batching system is SimaticWinCC, and the software realizes the following functions.
(1)The general view of the process and the running status of the equipment display the dosage program screen dynamically displays the process flow diagram and the working status of the running equipment for the operator to understand the production status of the system.
(2)Switching of process map
The dosage program provides the graphical interface of each process sub-system, which can be switched to different interfaces through buttons to show the actual production situation and related information of each production process part.
(3)Control mode selection
The weighing control system provides two remote control modes: automatic control mode and manual control mode. They can be set by selecting buttons on the dosage program interface. As a supplement to the automatic control mode, the manual operation mode provides flexibility for the human intervention of the control system.
(4)Parameter setting
Adjust the control parameters online according to the changing requirements of the production process.
(5)Real-time trend display
The dosage program provides real-time trend curve display of production process parameters. By selecting the button, different trend curves can be displayed so as to understand the production status.
(6)Alarm processing
In case of equipment failure, the system will prompt the operator through the alarm screen, prompting the detailed fault information in the alarm window and printing out the information at the same time.
