The drainage pumping station automatic control system based on 1200 PLC design

1 introduction the early urban development and planning, no attention to the construction of drainage facilities, resulting in the late of the many cities in our country almost every year in waterlogging. In recent years, the rapid development in most cities are facing in the process of waterlogging this serious problem. In July 2004, the Beijing municipal lasted (for) four hours of heavy rain, lead to Beijing more than 40 roads in the city. 2005, 2007 and 2010, guangzhou has had the heavy rainfall, the city a large area of water, serious impact on the traffic. One of the most serious is near the Yangtze river city, basically a heavy rain, will appear waterlogging. In recent years, the waterlogging caused many people casualties. With the waterlogging disaster occurred, municipal governments have started to pay attention to the importance of urban drainage system, waterlogging, guangzhou, nanchang, wuhan has invested a lot of money for the construction of the urban drainage facilities, but the effect is not obvious, waterlogging disaster or happen [ 1] 。 The urban drainage technology in China is not enough, also it is necessary to draw lessons from the technique and experience of developed countries. With the rapid development of cities, urban underground drainage facilities is complex, in the face of such a complex system, the previous traditional management method has been difficult to complete real-time monitoring of drainage. So for now, it is necessary to use modern technology, to establish a set of automatic monitoring urban drainage system. Urban drainage pumping station computer monitoring system can be real-time monitoring, urban drainage, and can quickly find fault, through the statistics of the city rainfall, found hidden dangers and issue a report to the police. This system is through the PLC, pump, frequency converter, sensors, constitute an automatic control system, such as collection of city water for constant water level control, simulate the flow of rain water, sewage and industrial wastewater, and the simulation of the pipeline jam, collecting basin of switch, etc. , to ensure the stability of the drainage system, drainage efficiency of ascension. The design of the system not only can realize the advantages mentioned above, still can save a lot of manpower and material resources [ 2 - 3] 。 2 of urban drainage monitoring system at present, the development of cities, urban drainage system is also different, USES the traditional relay control USES mostly. Because of PLC control system is widely applied to the order, under the control of the signal, in the process of production for each actuator and orderly work [ 3] 。 The advantage of PLC has a lot of, programming method, flexible, safe and reliable, fast and convenient maintenance and high cost performance. In this system, mainly through the button and all kinds of sensor signals to PLC, PLC receives the instruction before issuing commands control each actuator, thus to realize automatic control. According to the technological characteristics of the design of urban drainage pumping station monitoring and requirements, adopt the PLC controller network control system based on fieldbus. The PLC and the actual equipment is the main component. As shown in figure 1 for general system structure. Figure 1 in the design of general layout in this system structure, the PLC is a central controller, play a leading role, the PLC is mainly used to control the equipment normal operation, and timely send the information to the workstation equipment. 3 urban drainage pumping station design this design based on Siemens PLC control system, by PLC for data processing, then the operation of the control field devices to complete urban drainage pumping station monitoring automation and efficient operation of the control system, accurate operation. The design of the control system is fully automatic control, when the simulation software WINCC after the operation, just press start to start, will be on botu software PLC. Write the corresponding program for urban sewage drainage process control, and through the output of the relay action control pipe, valve and pump on off, and, via sampling analog signal analog module monitors all water irrigation and water pipe flow situation [ 4] 。 As shown in figure 2 for this article design a set of urban drainage pumping station monitoring system diagram. Figure 2 urban drainage system schematic diagram 4 control system hardware configuration of this system requires three analog input, 9 and 10 digital output, digital input that needs to be some allowance in the configuration. Integrated all aspects of factors. This design adopts Siemens s7 - 1200 PLC CPU 1214 c, a digital output module, a four-way analog module, can meet the demand of urban drainage control system design [ 5] 。 In this design, set up two sets pool, circulation water and 1 collection pool in turn. Can guarantee in the same road drainage system, water drainage won't appear in undrained condition, the AB set pool set up two drainage pump, after the collection pool set up two centrifugal drainage pump. When using frequency control of motor speed, each pump with a frequency converter. 4. 1 control system of PLC I / 0 address allocation table according to the design of the control system of the urban drainage pumping station computer, total need nine digital quantity input, 10 digital output and three analog input. Table 1, respectively, as shown in table 2 and table 3. Table 1 digital input distribution table number start signal name address note 1 I0. 2 stop I0 zero button. 1 button 3 I0 simulation of the rain. 2 sensor 4 I0 industrial wastewater. I0 3 sensors 5 life waste water. 4 sensor 6 block 1 I0. 7 block 2 I0 5 sensors. I0 6 sensor 8 A pool pump malfunction. 7 sensor 9 B pool pump fault I1. Table 2 0 sensor digital output distribution table number signal name address remark as a member, read on.
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