| PLC的PID及PWM功能在加热控制中的应用 |
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| 引用本文： | 柳仁松,徐世许,陈大程.PLC的PID及PWM功能在加热控制中的应用[J].工业控制计算机,2012,25(3):89+91-89,91. |
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| 作者姓名： | 柳仁松 徐世许 陈大程 |
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| 作者单位： | 青岛大学自动化工程学院,山东青岛,266071 |
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| 摘 要： | 选用欧姆龙CP1H型PLC,通过其脉宽调制(PWM)输出控制固态继电器通断,改变电加热炉的功率,实现高精度的温度控制.PWM的占空比对应固态继电器通断时间比,由PLC根据温度误差按PID算法计算出来.实际使用表明,当炉温控制在1200℃时,控制精度可达到±3℃.
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| 关 键 词： | PLC PID 脉宽调制 固态继电器 |
Application of Heating Control Based on PLC in PWM and PID |
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| Abstract: | Choosing CP1H type PLC of Omron and controlling the on-off of solid state relay through PLC’S pulse-width modulation(PWM) output,the power of an electric furnace is adjusted,so a high accurate temperature controlling can be realized.The duty cycle Of PWM corresponds to the on-off time ratio of solid state relay,which is calculated by the PLC according to the temperature error using PID algorithm.The control precision is ±3℃ when the furnace temperature is 1200℃. |
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| Keywords: | PLC PID pulse width modulation solid state relay |
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