IC756WRE099E-23,IC756WRE099E-23,IC756WRE099E-23
三菱FX2N PLC步進指令簡介,
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在FX2N系列PLC中只有兩條步進指令：STL（步進開始指令）和RET（步進結束指令）。
STL和RET指令必須和狀態繼電器S配合使用才具有步進功能。STL也稱為步進觸點指令（占1步），STL的梯形圖符號用 表示，稱為STL觸點，它沒有動斷觸點。STL S20 和STL S21都是STL觸點。在梯形圖中，STL觸點與母線相連，使用STL指令后，母線移至觸點右側，其后需用LD、LDI、OUT等指令，直至出現下一條STL指令或出現RET指令。STL指令使新狀態繼電器置位，而前一狀態繼電器自動復位，其觸點斷開。圖10-1表明了順序功能圖、梯形圖、語句表三者之間的嚴格對應關系。步進結束指令RET也稱為步進返回指令，梯形圖符號用 表示。在一系列STL指令之后必須使用RET指令，以表示步進指令功能結束，母線恢復至原位。
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