在标准扫描中,每次扫描将随每-次扫描所耗时间量的变化而尽快执行,对此的–种变法就是恒定扫描时间模式,其中每次扫描将消耗同样的时间量。对于恒定扫描定时器:一个5-200ms的数值可供选择(缺省值为100ms)。由于PLC扫描不同部分所需时间不同,当PLC处于一般扫描模式时,恒定扫描定时应设置成比按状态行所显示的扫描时间至少高出10ms。这样就将防止无关的重叠扫描错误的出现。
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