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             X0                                                                                              C1 K5
----------▏▏--------------------------------------------------------------------(           )
           啟 停                                                                                            X0動作 次數
                                                                                                    
--------［   =C1     K1    ］--------------------------------------------------［   SET   M1］
                                                                                                                X0動作1次M1 ON
          
--------［   =C1     K2    ］--------------------------------------------------［   RST   M1］
                                                                                                               X0動作2次M1 OFF
             M1                                                                                              Y20
----------▏▏--------------------------------------------------------------------(           )
            控制Y20                                                                                    輸出

                                                                                                                 M2        
---------［   =C1     K2    ］---------------------------------------------------(           )
                                                                                                              X0動作2次M2 ON

             M2                                                                                              
----------▏▏-------------------------------------------------------------------［   RST   C0］
             C0復位用                                                                                 X0動作2次C0復位

          

用計數的方式，按一下就啟動，按第二下就停止，也復位計數器歸零。