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使PLC程序尽可能简短,也是应追求的目标。简短的程序可以节省用户存储区;多数情况下也可节省执行时间,提高对输入的响应速度,还可提高程序的可读性。程序是否简短,一般可用程序所用的指令条数衡量,用的条数少,程序自然就简短。要想程序简短,从大的方面讲,要优化程序结构,用流程控制指令简化程序,从小的方面讲还要用功能强的指令取代功能单一的指令,以及注意指令的安排顺序等。
5.省时性(运行成本低)
程序简短可以节省程序运行时间,但简短与省时并不完全是一回事,因为运行程序时间虽与程序所拥有指令条数有关,而且还与所使用的是什么指令有关,PLC指令不同,执行的时间也不同,而且,有的指令在逻辑条件ON时执行与在OFF时执行其时间也不同,另外,由于使用了流程控制指令,在程序中不是所有指令都要执行等。所以运行程序的时间计算是较复杂的,但要求其平均时间少,大时间也不太长是必要的,这样可提高PLC的响应速度。省时的关键是用好流程控制指令,按情况确定一些必须执行的指令,作必备部分,其余的可依程序进行,有选择地执行,或作些分时工作的设计,避免大时间太长等。
Tocho- Ultra Sonic Cleaner, UP-605-100PC, NEW
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CCI Systems Electrical Dist. Box 208V, 50A, 3-Phase
CCI Systems Electrical Dist. Box 208V, 50A, 3-Phase
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TEGAL Electrical Dist. Junction Box 208V, 50A, 3-Phase
CCI Electrical Dist. Junction Box 208V, 50A, 3-Phase
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CCI Electrical Dist. Junction Box 208V, 50A, 3-Phase
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GL Automation Wafer Flat Aligner Model AWA6F6SP *NIB*
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Filter Pump Industries Model PM-1/2 RPM 1/2 HP - USED
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