NIB BALDOR 34-6549-3946G3
NIB BALDOR 34-6549-3946G3
NIB BALDOR 34-6549-3946G3BALDOR 34-6549-3946G3
在FX2N系列PLC中只有兩條步進(jìn)指令:STL(步進(jìn)開始指令)和RET(步進(jìn)結(jié)束指令)。
STL和RET指令必須和狀態(tài)繼電器S配合使用才具有步進(jìn)功能。STL也稱為步進(jìn)觸點(diǎn)指令(占1步),STL的梯形圖符號(hào)用表示,稱為STL觸點(diǎn),它沒有動(dòng)斷觸點(diǎn)。STL S20 和STL S21都是STL觸點(diǎn)。在梯形圖中,STL觸點(diǎn)與母線相連,使用STL指令后,母線移至觸點(diǎn)右側(cè),其后需用LD、LDI、OUT等指令,直至出現(xiàn)下一條STL指令或出現(xiàn)RET指令。STL指令使新狀態(tài)繼電器置位,而前一狀態(tài)繼電器自動(dòng)復(fù)位,其觸點(diǎn)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(yán)格對(duì)應(yīng)關(guān)系。步進(jìn)結(jié)束指令RET也稱為步進(jìn)返回指令,梯形圖符號(hào)用表示。在一系列STL指令之后必須使用RET指令,以表示步進(jìn)指令功能結(jié)束,母線恢復(fù)至原位。
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