A large number of Siemens S7-300 modules were recycled in Baotou for a long time.

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　　S7-200規定中斷優先級從高到低依次為:通信中斷、I/O中斷、定時中斷。每種中斷類型中的不同中斷事件具有不同的優先級，如表2所示。

　　一個程序中可以有128個中斷。S7-200根據先來先服務的原則為各自優先級組中的中斷提供服務。任何時候只能執行一個中斷程序。一旦一個中斷程序開始執行，它將一直執行到結束。不能被另一個中斷程序中斷，即使它是一個更高優先級的中斷程序。在中斷程序執行期間，新的中斷請求根據優先級排隊。中斷隊列中可以存儲的中斷數是有限的，超過了就會溢出。中斷隊列的最大中斷數和溢出標志位如表3所示。

　　(1)每個高速計數器都有一個32位的當前值和一個32位的預設值，這兩個值都是有符號的整數值。要設置高速計數器的新電流值和新預設值，有必要設置控制字節(表6-7 ),以便第五位和第六位為1，允許更新預設值和電流值，并將新電流值和新預設值寫入專用內部標志位存儲區。然后執行HSC指令，將新值傳輸到高速計數器。當前值和預設值占用的特殊內部標志位存儲區如表1所示。