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sin598
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樓主  發(fā)表于: 2021-06-04 16:26
CALL指令,跟CJ指令很相似。求大神發(fā)個(gè)樣例程序,體會(huì )下區別。還有在子程序中需要注意哪些事項
請叫我老鐵
人生就像蒲公英,看似自由,卻身不由己。
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1樓  發(fā)表于: 2021-06-04 17:05
描述:子程序單按鈕啟?刂
圖片:
描述:跳轉單按鈕控制
圖片:
子程序調用執行,不調用不執行,可嵌套調用,嵌套最多5層,編寫(xiě)子程序時(shí)先使用FEND結束主程序,子程序完成要寫(xiě)返回指令SRET。  
跳轉指令,在滿(mǎn)足跳轉條件之后的各個(gè)掃描周期中, PLC將不再掃描執行跳轉指令與跳轉標簽Pn間的程序,即跳到以指針Pn為入口的程序段中執行。直到跳轉的條件不再滿(mǎn)足,跳轉停止進(jìn)行,跳轉順序從上往下,不可反向,跳轉標簽Pn和子程序標簽Pn不能用重,在子程序和跳轉指令中使用定時(shí)器注意T192---T199和其他定時(shí)器有區別。

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