在設備中，有的出料傳送帶需要設計成來料時啟動，來料終止后過幾秒停止。梯形圖如下：


                                  X15                                                     T10                                                                                            Y16
----------------------------▏     ▏------------------------------------------▏ /    ▏-------------------------------------------------------------------------（          ）
                               來料時ON      ▏                                    無料計時                                                                                    傳送帶啟動
                                                     ▏
                     Y16                         ▏                       X15                                                                                                                           K50
-----------------▏      ▏--------------------------------------▏  /   ▏----------------------------------------------------------------------------------------（ T10     ）
                傳送帶啟動自鎖                                  無料時閉合                                                                                                   無料計時


                                    傳送帶可由受Y16控制的變頻器驅(qū)動。以上，僅供參考。