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WinCC application in sewage treatment

Abstract: In order to meet the needs of wastewater treatment automation, in-depth study of the characteristics of sewage treatment on the basis of automation control, industrial application WinCC configuration software developed appropriate control procedures. And discussed at the sewage treatment for the software and hardware, as well as the development process problems and solutions. Keywords: distributed control system PLC WinCC STEP7 WinCC of siemens Application in the dealing with sewage <LABEL class=lb onclick=automatically. Study hard with the characteristic and the specialties of the process. Develop the program which correspond to the process by using the WinCC.Also discuss the constitution of the hardware and the software.The problem we encountered in programming and the method of resolving is discoursed. Kaywords: DCS; PLC; WinCC; STEP7; 1, Introduction reform and development, China's industrial enterprises with each passing day, the growing scale , wider use of advanced equipment, process more and more high tech. In production, automation technology has spread to various fields and workshops, which fully demonstrates China's national industry began to grow. But, in contrast, in many companies emissions is not up to the passive situation. 2, WinCC About software WinCC Configuration Software is an integrated man-machine interface (HMI) system and the monitoring and management system, which is the Siemens company in the field of process automation advanced technologies and powerful software features Microsoft products, WinCC Windows Control Center is (Windows Control Center) for short. It includes graphic design, alarm records, mark records, report designer, a global script, the control center, user management and other functions, so that the process of coupling high-performance, fast screen updates, and reliable data management [1 ~ 2 ]. 3, the system constitutes water treatment project for a ordinary in terms of its project is huge, especially some large projects, so the development control process, debugging time can not as the factors must be considered. For reliability considerations, however, separation of the control system functions is essential, namely: the next crew for protection, control and data acquisition, as well as independently from the host computer to control the system, the implementation of the host computer display, operation, alarm , storage. Then the problem is caused by upper and lower computer communication has become a time-consuming work. WinCC to PLC and all major manufacturers to communicate, such as: AB, GE, Omron and so on. If the PLC series and with the Siemens STEP 7 software combined, will significantly reduce engineering time, because the variables defined in STEP 7 can be used directly in WinCC. As industrial <LABEL class=lb onclick=condensate <LABEL class=lb onclick=The process flow diagram shown in Figure 1. Figure 1, the body of sewage plant process flow diagram system of the host computer using industrial computer is configured to P Ⅲ 800,256 M RAM, 40G hard drive, 21 monitors, running Chinese Windows 2000 operating system, configuration software for the WinCC5. 0SP2 Chinese, through the communication card CP5611 (MPI / PROFIBUS) and the next crew communication; lower machine with S7-300 series CPU318-2DP, a total of 21 I / O card. As the entire treatment process relatively large area, the control circuit and more, in order to avoid the laying of a large number of control lines, so the module will use part of the Siemens ET200 I / O placed farther away from the central control room and the control point where they are concentrated , using the Siemens PROFIBUS-DP communication protocol to form a remote I / O. Control system structure shown in Figure 2. Figure 2, the body works <LABEL> event -> mouse action script to write the following C language code: # include OnClick (char * lpsz PictureName, char * lpsz ObjectName, char * lpsz PropertyName) { SetPictureName ( ); } / / , There is a need to always show the police records, with the color screen flashes to prompt the operator to have faults, you can use the same C language script (of course not added to the mouse action) at the bottom of the screen in the background, leaving a similar to the Windows status bar of the alarm bar, when there is fault alarm in the alarm when an alarm bar shows the recent record, the operator can use the button to switch to the main fault alarm record to understand the complete picture information. 4.2 the configuration of individual components WinCC gallery in its interior a lot of graphic objects in an integrated, such as water tanks, motors, valves, etc., for <LABEL class = lb onclick = In order to configure the screen close to reality, to better reflect site conditions, Gallery in the elements and can not meet the requirements. We can use the WinCC's drawing tools to draw their own graphic elements to adapt to the actual and the use of C script to produce animation. As shown in Figure 3. Figure 3, the configuration component elements pool for the adjustment, the reaction can be rectangular pools represented to fill the height of the graphic indicate the level of height. Here we must note that some numerical transformed into, as some instruments such as E + H ultrasonic level gauge, is 4 to 20 mA current signal into the PLC, set up the parameters for the table after the 4 mA corresponding to the corresponding pool The lowest level, and 20 mA corresponds to the highest level of the pond. So when you want to display digital high PLC values relative to 4.20 mA into the scope of the actual height of the pond, for example, 0.5 to 5.5 meters. But when The graph expressed as the percentage according to Therefore, the PLC should value into a 0 to 100% of the measurement range. C mixer configuration can be used to produce the animation script, in its run-time generated visual rotation. In fact the graphics blender is composed of two parts oval in oval Properties -> Geometry -> radius add the following code: # include long _main (char * lpszPictureName, char * lpszObjectName, char * lpszPropertyName) { static int x = 25, y, z; / / x is the radius of the initial value of 25, y for the switch variable, z state variables for the mixer running z = GetTagBit ( (y) { case 0: x = x-4; if (x <0> = 25) y = 0; break; } } return x; } 4.3 configuration voice alarm at the industrial site security is extremely important, both from the point of view, we should use all means to reduce failure. When the fault has occurred,[link widoczny dla zalogowanych], should be the first time in many ways inform the operator has fault. Modern micro-processing computer's processing speed can be fully qualified for the graphic