廈門市泰尼電器有限公司
主營產(chǎn)品: AB模塊PLC |
廈門市泰尼電器有限公司
主營產(chǎn)品: AB模塊PLC |
參考價 | 面議 |
【IC697MSC801】【IC697MSC801】
【】【】
功能塊圖(FBD)
功能塊圖是IEC61131-3的標(biāo)準(zhǔn)編程語言,采用類似于數(shù)字邏輯門電路的圖形符號,邏輯直觀,使用方便,但一些低檔的PLC并不支持FBD編程語言。S7—200的PLC專門提供了FBD編程語言,利用FBD可以查看到像普通邏輯門圖形的邏輯盒指令。它沒有梯形圖編程器中的觸點(diǎn)和線圈,但有與之等價的指令,這些指令是作為盒指令出現(xiàn)的,程序邏輯由這些盒指令之間的連接決定。也就是說,一個指令(例如AND盒)的輸出可以用來允許另一條指令(例如定時器),這樣可以建立所需要的控制邏輯。這樣的連接思想可以解決范圍廣泛的邏輯問題。
圖2 PLC功能塊圖
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