用PLC测转速介绍

  关于PLC，我是个初学者，今天在此对自己前一段时间的学习做个总结，以备后用。由于本人水平有限，本文一定还存在不少错误和不妥之处，敬请大家批评指正。
     本文所有程序，均在Step7Template.mwp中编写，CPU类型选西门子 S7—200系列226 CN。
     先说程序，测低速(每分钟1000转以下) ：   LD    I0.0
                                                                         LD    M20.1
                                                                        CTU   C0,+5000    //设定增计数器上限
                                                                        
                                                                        LD    SM0.0
                                                                         A     M20.0
                                                                       TON   T37,+30      //立即接通，延时三秒断开

                                                                        LD    SM0.0
                                                                         O     M20.0#p#分页标题#e#
                                                                         AN    T37
                                                                         =     M20.0         //设定T37定时器复位信号

                                                                        LD    M20.0
                                                                        LD    M20.1
                                                                       CTU   C1,+20     //设定增计数器C1上限

                                                                       LD      C1
                                                                      MOVW  C0,VW200     
                                                                        =     M20.2

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本文关键字：暂无联系方式PLC入门，plc技术 - PLC入门