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运算速度高速化
由于目前PLC的CPU模块竞相采用32位RISC芯片，运算速度大为提高。一般基本指令的执行速度均达到数十个纳秒（ns），如三菱电机的Q02HCPU其输入指令的执行时间为34ns，富士电机MICREX-SX系列SPH300达20ns，横河电机的FA-M3系列的F3SP59-7S其输入指令的执行时间为17.5ns。仅看一种指令的执行时间并不能完整地说明问题。日本电机工业会（日本电机工业的行业协会）JEMA一直倡导用PCmix值（即PLC的处理时间性能表示指标，用1微秒执行的基本指令和数据处理指令的平均次数来表示）来衡量PLC的运算速度。所谓1微秒执行的基本指令和数据处理指令的平均次数，是按PLC应用程序所使用的指令的频繁程度的统计平均值计算的。一般是基本指令占54%(其中输入指令占17%，输出指令13%，逻辑运算指令21%，定时器输出3%)，数据处理指令占39%（其中传送指令占25%，四则函数运算指令，比较指令6%），其它指令7%。仍以三菱电机的小Q系列为例，其中的Q25HCPU的PCmix值是10.3，比A2UHCPU-S1快5倍（为2.0），比A2SHCPU快20倍多(PCmix值为0.5)。随着PLC的功能扩展，运算指令、文字处理指令、通信指令等用的越来越多，各种指令的使用频率也会发生一定的变化，PCmix值的计算也会有所变化。这里顺便提一下，之所以要多次举三菱电机为例，是因为它的PLC的市场份额占日本的50%以上，为日本的最大PLC供应厂商，因而具有相当的典型性。同时，通过软件技术提升PLC专用操作系统的水平，实现了事件中断的高速响应（200微秒）功能，高速计数功能，0.5毫秒（三菱电机的小Q系列PLC）、甚至0.2毫秒（横河电机的的FA-M3系列PLC）的恒定扫描时间功能
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