IC200UEX211-B
在SIEMENS S7-200的编程软件STEP-7中,有专门的比较指令:IN1与IN2比较,比较的数据类型可以是B、I(W)、D、R,即字节、字整数、双字整数和实数;还可以有其他的比较式:>、<、≥、≤、<>等等。当满足比较等式,则该触点闭合。
与LMODSOFT指令对照:在LMODSOFT中,没有直接的数的比较指令,但SUB指令可以通过其执行减法功能后的三个输出端的状态实现整数的比较功能。
若与LMODSOFT 中的SUB指令对应,则在STEP-7中应有三个比较指令: >、=、< 来分别对应SUB 指令的三个输出;若还要对应≥、≤、或<>,则根据SUB指令三个输出端的不同组合,均可找到对应的比较指令。
比如:①(30007)>(40030)
②(30007)=(40030)
③ (30007)<(40030)
①+②(30007)≥
②+③(30007)≤(40030)
①+③(30007)<>(40030)
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