描述
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,最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,避免最大时间太长等。
继承性(变动成本低)
要使程序具有继承性,那就是要便于修改和移植。PLC的特点之一就是方便,可灵活地适用于各种情况,其办法就是靠修改或重新设计程序,重新设计程序用于PLC工艺用途已经更改的情况,不仅程序重编,而且I/O也要重新分配,即便如此,很多独立功能的子程序依然可以适用于不同的工艺控制;对于相同或类似的工艺控制,多数情况下不需要重编程序,作一些修改就可以了。这就要求程序具有继承性,具有方便快捷的通用性接口,便于参数修改和程序的移植。
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