基于plc的張力控制系統(tǒng)的發(fā)展(英文翻譯)-全文預(yù)覽
【正文】 ltime tension and the scroll radius. In order to solve this problem, a control program is developed for the host puter on the interface of which the operator can perform the input of the parameter and the display of the realtime tension, the speed and the scroll radius. The programming port of all the FP PLC’s support OPEN MEWTOCOL PROTOCOL. Upper puter sends a COMMAND to PLC as an ASCLL string. Then the PLC automatically returns the RESPONSE based on the COMMAND. The inputs of the system are the voltage feedback by radius following device, the torque feedback of alternating numeric servoelectromotor and the velocity feedback. The output of the system are alternating numeric servoelectromotor torque and velocity voltage. The software control flow of the tension control system is shown in . 5 Simulation and Experimental Results Experimental research of the tension control in real winding states was carried out through simulating the real working circumstances to test the feasibility and control precision. When the tension was set to 10 N, the constanttension curve under simulation and experimental conditions can be acquired with a near constant tension, as shown in and , respectively. In order to know the work state of the AC servo motor when the tension changes, the tension force was changed from 5 N to 10 N and the variation curves of which are shown in and under simulation and experimental conditions, where the overshooting and fluctuation are rather small and the response time is less than s. Analysis of static difference rate Static difference rate is a very important indexfor evaluating the performance of the system. It can be expressed as follows where ΔT = Tmax ?Tmin ,Tmax is the maximum tension, Tmin is the minimum tension, and Tm is the average tension. The analysis of static difference rate of tension is shown in Table 1. Table 1 The analysis of static difference rate of tension Analysis of fluctuation rate Whether the tension fluctuating rate meets the requirements is a key index for evaluating the performance of the designed tension control system. Enacted a initialized yarn tension, after pensation calculation, output it. Then, test the actual tension and find out the maximum and minimum tensions. 6 Conclusions Simulation and experimental results show that the system is feasible with the PLC as the kernel,the AC digital servo motor as the execute element and a radius following device to perform the radius pensation. The characteristics of the system include (1) A Panasonic FPseries PLC and functional modules serve as the control kernels. The small volume, high integrity, high reliability, excellent control capability and the low cost all make the system convenient and pact with high enough reliability and precision. (2) The yarnretaking device can be left out, because the servo motor can perform the same function. (3) The modularized software design facilitates the construction expansion and the secondary development of the customers. (4) The friendly programming environment of the Panasonic FPWIN_GR software encapsula
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