27025020000C
FX系列PLC有基本邏輯指令20或27條、步進(jìn)指令2條、功能指令100多條（不同系列有所不同）。本節(jié)以FX2N為例，介紹其基本邏輯指令和步進(jìn)指令及其應(yīng)用。
FX2N的共有27條基本邏輯指令，其中包含了有些子系列PLC的20條基本邏輯指令。
堆棧指令（MPS/MRD/MPP）
堆棧指令是FX系列中新增的基本指令，用于多重輸出電路，為編程帶來(lái)便利。在FX系列PLC中有11個(gè)存儲(chǔ)單元，它們專門用來(lái)存儲(chǔ)程序運(yùn)算的中間結(jié)果，被稱為棧存儲(chǔ)器。
（1）MPS（進(jìn)棧指令） 將運(yùn)算結(jié)果送入棧存儲(chǔ)器的第一段，同時(shí)將先前送入的數(shù)據(jù)依次移到棧的下一段。
（2）MRD（讀棧指令） 將棧存儲(chǔ)器的第一段數(shù)據(jù)（最后進(jìn)棧的數(shù)據(jù)）讀出且該數(shù)據(jù)繼續(xù)保存在棧存儲(chǔ)器的第一段，棧內(nèi)的數(shù)據(jù)不發(fā)生移動(dòng)。
（3）MPP（出棧指令） 將棧存儲(chǔ)器的第一段數(shù)據(jù)（最后進(jìn)棧的數(shù)據(jù)）讀出且該數(shù)據(jù)從棧中消失，同時(shí)將棧中其它數(shù)據(jù)依次上移。
堆棧指令的使用如圖1所示，其中圖1a為一層棧，進(jìn)棧后的信息可無(wú)限使用，最后一次使用MPP指令彈出信號(hào)；圖1b為二層棧，它用了二個(gè)棧單元。
a) 一層棧 b) 二層棧
堆棧指令的使用說(shuō)明：
1）堆棧指令沒(méi)有目標(biāo)元件；
2）MPS和MPP必須配對(duì)使用；
3）由于棧存儲(chǔ)單元只有11個(gè)，所以棧的層次最多11層。
公司名稱：廈門潤(rùn)星貿(mào)易有限公司
聯(lián)系人：吳偉杰
QQ:2563095702
E-mail:2563095702@qq.com
電話：0592-6895320
手機(jī)：18030263579
傳真：0592-6034581
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