IC647PWR003,IC647PWR003,IC647PWR003
步進梯形圖和指令表程序的編程方法
1. 狀態轉換的實現
步與步之間的狀態轉換需滿足兩個條件：
Ø 前級步必須是活動步；
Ø 對應的轉換條件要成立。
滿足上述兩個條件就可以實現步與步之間的轉換。值得注意的是一旦后續步轉換成功成為活動步，前級步就要復位成為非活動步。
2. FX系列PLC的步進順控指令
FX系列 PLC的步進指令有兩條：步進觸點驅動指令STL和步進返回指令RET。
STL：步進觸點驅動指令 梯形圖符號為
① STL指令有主控含義，即STL指令后面的觸點要用LD指令或LDI指令。
② STL指令有自動將前級步復位的功能（在狀態轉換成功的第二個掃描周期將前級步復位）。
步進返回指令 梯形圖為
一系列STL指令后，在狀態轉移程序的結尾必須使用RET指令，表示步進順控功能（主控功能）結束 。
3. 步進梯形圖和指令語句表編程：
① 先進行驅動動作處理，然后進行狀態轉移處理，不能顛倒。
② 驅動步進觸點用STL指令，驅動動作用OUT指令。若某一動作在連續的幾步中都需要被驅動，則用SET指令。
③ 連續向下的狀態轉換用SET指令，否則用OUT指令。
④ 相鄰兩步的動作若不能同時被驅動，則需要安排相互制約的聯鎖環節。
⑤ CPU只執行活動步對應的電路塊，因此， STL指令允許雙線圈輸出。
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