The rapid development of science and technology has brought revolutionary changes to the current industrial automation. The traditional system control methods that rely on relays and separate electronic circuits have been far from meeting the control requirements. Therefore, PLC control technology came into being, which makes a qualitative leap in industrial control technology all over the world. However, its pure logic sequence control function and opacity in the control process still have defects in some fields. To this end, this paper puts forward the design idea of ​​a new artificial simulated rainfall system that uses B & R as the lower computer control system and the upper computer configuration using Kingview, which greatly improves the stability, monitoring and effectiveness of the control process , Solved the problem well.
1. Introduction of Artificial Rainfall
This standard runoff field artificial rainfall simulation system is built on a natural slope. The height is about 10m. 96 X-shaped downspray nozzles are evenly distributed within the range of 20m & TImes; 5m. The nozzles are composed of four different nozzle apertures. There are 24 groups, each of which is controlled by 24 solenoid valves; an electric flow regulating valve and a pressure gauge are set on the water supply pipeline, the pipeline flow is controlled by adjusting the opening of the flow regulating valve and the current pipeline pressure is displayed.
Through the control of artificial rainfall water supply pipeline flow and artificial rainfall sprinklers, the artificial rainfall simulation process of different intensity, distribution and duration is realized; and the system provides real-time accurate and effective raw data, which can The effects of soil water content on soil infiltration in different periods and the laws of soil water movement during rainfall are simulated. The implementation of this system will definitely help the development of runoff research.
2. System hardware composition
2.1 Introduction of Programmable Computer Controller (PCC).
Programmable Computer Controller (PCC for short) was proposed by the Austrian B & R Automation Company in 1994 in the industrial control field. It combines the characteristics of an industrial control computer (IPC) with a conventional programmable controller (PLC). Whether it is from the internal hardware function, or from the external programming, the simplicity of the development environment, it is a big improvement over the conventional programmable controller PLC. PCC hardware and software have the following characteristics:
2.1.1 The CPU module adopts multi-processor structure.
2.1.2 Qualitative time-sharing multitasking operating system.
2.1.3 Modular structure, flexible system configuration, easy to install.
2.1.4 Larger program storage space.
2.1.5 Advanced programming language.
2.2 The composition and function of the system.
According to the characteristics of the artificial simulated rainfall control system, this control system uses Advantech industrial control computer as the upper computer, and B & R PCC-2003 series modules as the lower computer. The upper computer adopts IPC2000 to install B & R AutomaTIon Studio V2.40 operating system; the lower computer adopts high-performance programmable computer controller B & R PCC-2003 series CPU474, analog input module AI774, analog output module AO352, digital mixed module DM465, etc .; the communication of upper and lower computer adopts CAN bus or RS232 bus.
The system hardware structure is shown in Figure 1:
Figure 1 System hardware structure
The entire system adopts a two-level distributed upper and lower computer structure. The human-machine interface of the upper computer system can be monitored across the board. It has functions such as pressure status display, animated simulation of rainfall, pipeline pump, solenoid valve, flow control valve opening control and display. The lower computer is composed of B & R 2003 series programmable computer controller. The CPU module communicates with the upper computer and monitors the field equipment; the analog input module AI774 is connected to the pressure gauge and flow control valve to display the pressure and the opening of the control valve; analog The output module AO352 is connected to the flow regulating valve to control the opening of the regulating valve; the output function of the digital mixing module DM465 is used to control the opening of the pipeline pump and solenoid valve.
　　
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