In man-machine interface and SC500PLC application in industrial control

With the development of industrial automation control, human-machine interface (a kind of new industrial control products Touch screen) Appear, giving industrial site equipment control a new graphical interface ─ ( 了) 。 It can adopt high-speed communication 32-bit RISC chips, interactive, programming is simple, flexible, and the connection between PLC and is simple, simplifying the control cabinet design, save the actual input and output points of PLC, start is widely used in industrial equipment control. Now water needle bottle disinfection production line as an example, introduces the system configuration and application. A disinfection, technological process and requirement of water front glass bottle production line equipment diagram as shown in figure 1. Glass bottle from the entrance, touching the sensor 1, start walking machine tape, drive the bottles from entrance to exit, via preheating zone, sterilizing zone, cooling zone. Only import fan, hot fan and outlet fan, exhaust fan, to walk with. Such as the entrance into the bottle too fast, 2 extrusion sensor signal to stop in front of the equipment into the bottle. 3 signals such as export, sensor, stop walking machine work. Five fan as long as there is a stop, stop the heater running, and alarm display. Tests of the fan is not running sensor switch is installed in the exit of the fan, the fan frequency converter fault output point into the PLC, walking machine and the motor of air switch trip contact into the PLC, heater installed in the middle of the stove top, down by the hot air blower spread evenly heating. For different size of glass bottle in different temperature Settings. Can show the temperature district, and has the shape of the reaction temperature curve. For export fan, hot fan, fan should have to detect the wind pressure, according to the numerical to determine whether a filter clogging. Figure 1 production line equipment sketch in normal work, working after work, when the temperature dropped to below 100 ℃, device can automatically power off. Such as furnace and bottle has not processed, then start working at night. So under 100 ℃ after downtime, and import and export fan fan work, in order to make sure the external dust could not enter in furnace. Time for disinfection, the exit of the sensor data gathered by PLC, through the speed into time, to show the glass bottle in the disinfection disinfection time, in order to ensure the reliability of disinfection. Equipment meets the requirements under the guarantee, can accurately display failure points and countermeasures to solve the problem, and animation production field work situation. Second, the system configuration for the above requirements, we choose zhong da - Mick, human-computer interface, PLC to form a control system. Models for PWS - human machine interface 3760 - The screen is true color 10 TFT. 4 inch screen, using 232 to download and programming, using RS422 and PLC controller communication. Choose image can better reflect the scene view, animation lifelike, beautiful. PLC controller is chosen SC - 500 series, this machine has the function of input, output, 1024 points, a RS232 communication port and 1 RS422 communication port, is a modular model, flexible configuration function module and input and output points. Input matching XDC10 10 6 DC input module 2 piece, output and relay output module 1 YRY10 ten six. The simulation input unit adopts AD020 four road input module, input three wind pressure analog quantity ( 4mA～20mA） 。 Temperature input unit adopts THM10 five road with PID to adjust PWM output temperature control module 1 piece, mining into three way: heating, sterilization, cooling zone temperature. The system structure is shown in figure 2. Figure 2 system configuration in figure 3, debugging, operation of the system is the most important thing is that the temperature control precision of disinfection area of debugging, disinfection district heating system consists of five groups of heating wire heating unit, one of the basic heating unit, the other four groups of the PID temperature control heating unit. Before the production line adopts OMRON PLC, the situation is: the production trial run, a temperature curve too much volatility ( ±8℃） 。 More than factories require disinfection temperature fluctuations pointer ( ±2℃） 。 Actual debugging two measures were taken to control the temperature fluctuation. （ 1) Adopt double plug temperature decline a PID temperature control system. When platinum thermal resistance detected 1 ℃ in the sterile area temperature is lower than the set temperature. Through two position PID temperature control system of PLC will all seven groups of heating unit put into operation for 30 seconds, and then through the platinum thermal resistance testing disinfection zone temperature, controlled by PID temperature control unit, until the temperature reached set value. （ 2) Temperature adjustable volume control. First to test the sterilization temperature, if the temperature is greater than the set value, the PLC controller will be forced to remove all seven groups of heating unit, and continually testing temperature disinfection area, according to the actual situation to make real time control, at the scene of some parameters of the control program must be modified. After repeated and the debugging, the temperature control precision completely conform to the requirements of the manufacturer. Found in the debugging of system, the control system can completely through the program for further modification and debugging. To a higher temperature control precision. In the SC - After 500, as a result of our THM10 can separate PID values, so convenient the temperature stability within the plus or minus one degree, more than the technical requirements.
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