X0                                                                                              C1 K5
----------▏▏--------------------------------------------------------------------(           )
           启 停                                                                                            X0动作 次数
                                                                                                    
--------［   =C1     K1    ］--------------------------------------------------［   SET   M1］
                                                                                                                X0动作1次M1 ON
          
--------［   =C1     K2    ］--------------------------------------------------［   RST   M1］
                                                                                                               X0动作2次M1 OFF
             M1                                                                                              Y20
----------▏▏--------------------------------------------------------------------(           )
            控制Y20                                                                                    输出

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

             M2                                                                                              
----------▏▏-------------------------------------------------------------------［   RST   C0］
             C0复位用                                                                                 X0动作2次C0复位

          

用计数的方式，按一下就启动，按第二下就停止，也复位计数器归零。