各位大俠，小弟初學只能看著現有機器內的程序解讀，而且注釋都被別人控著。所以請教如下問題：

S7-300一段程序，FB打開了就是這個東西  我看調用結構說是SFB4   。沒有查到具體資料啊。

程序段1：              

                                                               [     #STAT4          ]

                                             ------------- [ EN            ENO  ] -----------

                                                               [                      Q    ] ---#  OUT3

                     #IN1             #IN2            [                             ]

         ---------[          ]-------[         ]------  [   IN                      ]

                                                                [                        ET]-----...............

                                                   ......-----[PT                         ]



程序段2：

L #IN0
T #STAT4.PT

請大俠辛苦解釋下唄 謝謝

祝大家新年快樂啊~~~~~~~~