A20B-2900-0691

A20B-2900-0691

三菱PLC中FB塊就是一個功能塊，可以供主程序在各個地方進行調用，但又不同于FC函數，因為FC有返回值，有點類似于子程序的調用方式，但是子程序又無法直接進行參數傳遞。（歡迎大家補充）

FB用在什么場合下？

1、結構化編程時，需要很清楚明了地展示出程序結構時；

2、程序中有大量重復性的控制代碼時（多氣缸，多伺服，多電缸，，）

3、FB塊可以用ST編寫，也可以用梯形圖編寫。

FB塊在多氣缸控制系統中的應用案例

某一自動化系統中有20個氣缸（單線圈），由于氣缸的控制基本上都是一樣的（氣缸去工位，氣缸回原位等），所以這個時候采用FB就很方便。本例主要以自動狀態下氣缸的去工位和回原位的控制進行簡單說明，大家也可以在此基礎上根據自己的需求進行靈活的應用。

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