After observing and summarizing various fountain control systems, the overall scheme of landscape control system is designed, and on the basis of analyzing the specific workflow of landscape control system, the flow chart with PLC as the core component is designed and drawn. Specific procedures have been worked out; The hardware circuit is designed. In addition, the hardware and software are debugged. At the same time, the program summary can be compiled flexibly by using the timing function, counting function and stepping function of PLC. This paper is based on the observation and summary of many landscape control systems. Based on the analysis of the specific working process of the landscape control system, the overall scheme of the landscape control system is designed with PLC as the core part. Design and draw the flow chart, compile the specific program, design the hardware circuit, and debug the hardware and software. At the same time, PLC timing function and county function stepping function can be used to flexibly write ventilation and modify the program keywords: artificial fountain; PLC control technology; Application keywords of programmable controller: artificial fountain; PLC control technology; Programmable controller application directory 1 Introduction to the overall design of ......................................................................................................; Design of the control system of ....................... 32 Fountain. ...... ...........................................................................3 2. 1 Programmable Controller ... Layout of Fountain Control System ........................................................................................ 4 2.2 .................................. ...........'s work flow chart ............................................... 5 2.3 Fountain control system. Software Design of Operation Mode of ........................................................................................... 53 Fountain Control System ........................................... ..............................................6 3. 1 Fountain control system ................................................................................................ 7 3.2 Fountain control system state transition diagram .......................................................... error! Bookmark is not defined. 3.3 Ladder Diagram of Fountain Control System 3.4 Fountain Control System I/ Distribution Table .......................................................................................... 1 5 3.5 Fountain control system design scheme .............................................................. error! Bookmark is not defined. 4 Hardware Design of Fountain Control System .................................................................................... 18 4. 1 .................................................................., the main circuit of Fountain Control System, is wrong! Bookmark is not defined. 4.2 Fountain control system control circuit .............................................................. error! Bookmark is not defined. 5 Fountain control system debugging ............................................................ error! Bookmark is not defined. 5. 1 .............................................................. error in software debugging of fountain control system! Bookmark is not defined. 5.2 Fountain control system hardware debugging .............................................................. error! Bookmark is not defined. 5.3 Fountain control system software and hardware debugging .......................................... error! Bookmark is not defined. Sum up ..............................................................................................'s mistakes! Bookmark is not defined. Refer to ...................................................................................... error! Bookmark is not defined. Thanks to .............................................................................................. for his mistake! Bookmark is not defined. .......................................................... error in work (software) instruction manual! Bookmark is not defined. 1 preface Fountain is the most vital fountain in the artificial environment, which has the functions of separating space, increasing levels, purifying air and beautifying the environment. Modern high-tech organically combines wonderful music, colorful fountain modeling, colorful underwater lighting and magical laser graphics and texts through computers, giving people supernatural enjoyment of the trinity of musical sound, visual image and color change. With the continuous improvement of people's material living standards in China, the requirements for spiritual life are getting higher and higher. It is necessary to build a fountain to further transform the environmental landscape. With the continuous development of science and technology and the continuous improvement of living standards, especially fountains play a particularly important role in the environmental construction of cities and communities. Nowadays, the combination of fountain engineering and high technology is an inevitable trend of historical development. Because of the extensive use of high technology in the fountain project, the fountain effect is more colorful, graceful, pleasing to the eye and lingering. This graduation project is a design of fountain control system with PLC control as the core. This fountain control system is mainly an artificial fountain. Under the control of PLC, a variety of water columns are sprayed, giving people a visual aesthetic enjoyment. 2. Design of the overall scheme of fountain control system 2. 1 System design of programmable controller to determine the control object and control range; PLC hardware selection; software design and simulation debugging; N Does the regulation hardware meet the requirements of design and regulation software? Y put into operation Figure 2- 1 System design flow chart of programmable controller As can be seen from Figure 2- 1 above, when designing a fountain control system with PLC, you should first be familiar with the characteristics and working process of the fountain control system and summarize the working cycle diagram; Secondly, the control scheme of fountain control system is formulated and PLC is selected. According to this graduation project, the PLC chosen is Mitsubishi FX series. Thirdly, according to the specific control requirements of the fountain control system, I/O distribution table is listed, and the hardware and software are designed. The fourth is simulation debugging, that is, after the designed program is input into PLC, it should be carefully checked and verified to correct the grammatical errors in the program design, and then the user program should be simulated and debugged in the laboratory to observe whether the changing relationship between input and output and the logical state meet the design requirements, and if problems are found, it should be revised in time until it meets the requirements of process flow and state flow chart; Fifth, transfer the program after simulation and debugging to PLC memory to access the actual input wiring and load of PLC. 2.2 Layout of Fountain Control System According to the technological requirements, working characteristics and environmental conditions of Fountain Control System, a reasonable design scheme was selected. The layout of fountain system is shown in Figure 2-2. As can be seen from Figure 2-2, the appearance of this artificial fountain is circular, and the sprinkler system I has four floors. From the inside out, they are: the first floor, the second floor, the third floor and the fourth floor. The control system adopts PLC as the central control link, and uses PLC's timing control, counting control and step control to realize the water spraying process of alternating changes of different patterns in different time sequences of the first layer, the second layer, the third layer and the fourth layer. 2.3 The working flow chart of the fountain control system can be seen from the following flow chart 2-3: First, press the start button, and the two small nozzles next to it start spraying water at the same time. After a delay of 3s, the sprinkler on the second floor will start spraying water. After a delay of 3s, the sprinkler on the third floor will start spraying water. After a delay of 3s, the sprinkler on the fourth floor will start spraying water. After a delay of 5 seconds, the nozzles on the third and fourth floors began to spray water. After a delay of 5 seconds, the sprinklers on the first floor, the second floor, the third floor and the fourth floor all began to spray water. After a delay of 4 seconds, the nozzles on the first floor stop spraying for 5 seconds, the nozzles on the second floor stop spraying for 5 seconds, and the nozzles on the third floor stop spraying for 5 seconds, and so on: after a delay of 8 seconds, the nozzles on the first floor and the third floor start spraying water, and so on. Repeat the above actions again until the start button is pressed to end a program and all nozzles stop working. Press the start button on the fourth floor and start spraying water in turn. The fountain next to it began to spray water on the first and second floors. Water began to spray on the third and fourth floors. The fourth floor stopped spraying water on the first floor, and the third floor sprayed water on the second floor and the fourth floor in turn. Is it circulated three times? Figure 2-3 Flowchart of Fountain Control System 3. 1 Software Design of Fountain Control System 3. 1 Operation Mode of Fountain Control System Specific design steps: Press the Start button: two small ones next to it. The fountain on the left sprays water, and the fountain on the right sprays water. Fig. 3- 1 Control the water spray flow. Fig. 2 The sprinkler on the first floor begins to spray water, and the sprinkler on the first floor, the second floor, the third floor and the fourth floor is realized in sequence, with an interval of 3s. As shown in Figure 3-2. 3s 3s 3s 3 The first layer sprays water, the second layer sprays water, the third layer sprays water, and the fourth layer sprays water. Figure 3-2 shows the flow chart of water spraying control. Figure 3) The sprinklers on the first and second floors start to spray water, and after an interval of 5s, the third and fourth floors start to spray water, as shown in Figure 3S3S5S5. The first and second floors spray water, and the third and fourth floors spray water, as shown in Figure 3-3. Figure 4) All four floors are sprayed with water for 4s, as shown in Figure 3-4. Four floors are sprayed with water for 4s, as shown in Figure 3-4. Control the water spray flow. Fig. 5) Stop spraying on four floors one by one with an interval of 5s, as shown in Figure 3-5. 5S5S5S5 Stop spraying on the first floor, the second floor, the third floor and the fourth floor, as shown in Figure 3-5. Flowchart 6) The first and third floors are sprayed with water at an interval of 8s, and the second and fourth floors are sprayed with water for three times, as shown in Figure 3-6. 8s 8s Spray water three times on the first and third floors and three times on the second and fourth floors. Figure 3-6 Flowchart for controlling water spraying Figure 7) When the counter of PLC reaches three times, the system will automatically return and restart the cycle until the start button is pressed again to complete a cycle, and the system will automatically shut down. 3.2 Fountain control system state transition Figure 3.3 Fountain control system trapezoidal Tu Tu 3-7 Fountain control system state transition diagram This graduation project adopts step instruction, and the state transition diagram of Fountain control system is shown in Figure 3-5. Because according to the function of the artificial fountain, compared with the ladder diagram, the step instruction is more suitable. As can be seen from the above state transition diagram, the transitions between states are separated, and adjacent states have different actions. When the transition conditions between two adjacent States are met, the transition is realized. As shown in Figure 3-7, when the start button is pressed, the two small nozzles next to it will start spraying water at the same time. After a delay of 3s, the sprinkler on the second floor will start spraying water. After a delay of 3s, the sprinkler on the third floor will start spraying water. After a delay of 3s, the sprinkler on the fourth floor will start spraying water. After a delay of 3s, the sprinklers on the first and second floors will start spraying water. After a delay of 5 seconds, the sprinklers on the third and fourth floors will start spraying water. After a delay of 5 seconds, the sprinklers on the first floor, the second floor, the third floor and the fourth floor all began to spray water. After a delay of 4 seconds, the first layer nozzle stops spraying for 5 seconds, the second layer nozzle stops spraying for 5 seconds, and the third layer nozzle stops spraying for 5 seconds, thus carrying out a small circulation system: after a delay of 8 seconds, the first layer nozzle and the third layer nozzle start spraying water, and so on for three times. Repeat the above actions again until the start button is pressed to end a program and all nozzles stop working. 3.4 Fountain control system I/O distribution table Fountain control system I/O distribution table is shown in table 1 table 1 input/output start/stop button X 1 spray Y000 on the first floor, spray Y00 on the second floor1spray Y002 on the third floor, spray Y0043.5 on the fourth floor, and design scheme of fountain control system. 7 STL S 2265438+ 1STL S0 19 OUT t 1 K304 LD x 00 1 22 LDI t 15 SET Y004 23 SET y 00 16 SET s 2 1 24 ldt18 STL S2125 set s239 out to k30 27 STL S2312 ldit0 28 rst y0065438 out of T3 K30 70 STL s 2742 LDI T3 7 1 RST y 00243 set Y003 72 RST Y00344 LD T3 73 out T6 K4045 set S25 76 LDI T647 STL S25 77 set Y00048 RST Y003 78 set Y00 1 49 T4 K50 79 sets Y00252 LDI T4 80 sets Y00353 sets Y00081LDT6 OUTT7 K5091LDT7125 set S3392 set S291 27 STL s 3394 STL S29 128 OUT t 12k 8095 RST y 00 1 1365 438+0 OUT y 00 196 OUT T8 K50 132 OUT y 000 / kloc-0/46 RST Y0 04 1 15 LD t 10 147 OUT s 0 1 16 SET S32 149 ret 1 18 STL S32 / Kloc-0/50 end119 out t180km1km2k3km4fr0fr1fr2fr3fr4m1m23mm4 Figure 4- 1 main loop is adopted. The outer layer is sprayed with 7.5kW submersible pump, and the first floor to the third floor is towed with 3kw submersible pump, which is used for the small fountain next to the 5.5kw submersible pump. The technical parameters of submersible pump are shown in Table 2. The main circuit is controlled by PLC and controls the coil of AC contactor; The closing and opening of the main contact of AC contactor is controlled by the power gain and loss of AC contactor coil; So as to control the operation and stop of the motor; Use a motor to drive the water pump to spray water. 4.2 Control circuit of fountain control system