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為了保證操作人員的安全，很多設(shè)備都會(huì)安裝安全光柵，但如果出現(xiàn)需要近距離觀察時(shí)，往往會(huì)因?yàn)槿梭w遮擋光柵而停機(jī)，為此介紹一個(gè)梯形圖，供大家參考。
              X10                                          X11                                            M20
------------▏/  ▏-----------------------------------▏   ▏---------------------------(                         )
             光柵                           ▏             光柵解除                            遮光信號(hào)保持
                                               ▏
                                              ▏
                                              ▏
        M20                   X12     ▏                                                                                                                                                                                                 
-------▏   ▏----------------▏/  ▏----
  遮光信號(hào)保持           復(fù)位



                                           以上，僅供參考。