| S7-300C集成的PWM和频率测量功能应用 |
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| 引用本文： | 余海勇.S7-300C集成的PWM和频率测量功能应用[J].兵工自动化,2007,26(5):85-85,91. |
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| 作者姓名： | 余海勇 |
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| 作者单位： | 中国兵器工业第五八研究所,自动化工程技术部,四川,绵阳,621000 |
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| 摘 要： | 西门子S7-300系列PLC的CPU模块内集成了PWM脉宽调制和频率测量功能,通过调用其相应的系统功能函数块SFB47、SFB49,能产生可以调节频率的脉冲,并能对步进电机反馈的编码器信号进行计数.通过计算所需脉冲周期和脉冲数,可实现步进电机的速度控制和位置控制,由此实现步进电机的脉冲驱动和位置定位.
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| 关 键 词： | PWM脉宽调制 频率测量 系统功能函数块 |
| 文章编号： | 1006-1576（2007）05-0085-01 |
| 收稿时间： | 2007-03-19 |
| 修稿时间： | 2007-03-192007-04-14 |
Application of PWM and Frequency Measurement Integrated in S7-300C |
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| YU Hai-yong.Application of PWM and Frequency Measurement Integrated in S7-300C[J].Ordnance Industry Automation,2007,26(5):85-85,91. |
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| Authors: | YU Hai-yong |
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| Affiliation: | Dept. of Automation Engineering Technology, No.58 Research Institute of China Ordnance Industry, Mianyang 621000, China |
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| Abstract: | The CPU module of SIEMENS S7-300 PLC integrates pulse-width modulation(PWM) and frequency measurement.By using its system function block SFB47 and SFB49,the CPU can send switching frequency pulse,which can drive the step-motor.It also can count the feedback signals from step-motor.By counting pulse cycle and pulse number,the speed control and position control of step motor can be carried out.At last,the pulse drive and position location of step motor can be achieved. |
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| Keywords: | Pulse-width modulation(PWM) Frequency measurement System function block |
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