详细介绍
EPRO CON011/916-XXX前置器
EPRO CON011/916-XXX前置器
PLC接通电源并开始运行后,立即开始进行自诊断,自诊断时间的长短随用户程序的长短而变化。自诊断通过后,CPU就对用户程序进行扫描。扫描从0000H地址所存的*条用户程序开始,顺序进行,直到用户程序占有的后一个地址为止,形成一个扫描循环,周而复始。顺序扫描的工作方式简单直观,它简化了程序的设计,并为PLC的可靠运行提供了保证。一方面所扫描到的指令被执行后,其结果马上就可以被将要扫描到的指令所利用。另一方面还可以通过CPU设置扫描时间监视定时器来监视每次扫描是否超过规定的时间,从而避免由于CPU内部故障使程序执行进入死循环而造成的故障。
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