EPRO CON011/916-XXX前置器

 EPRO CON011/916-XXX前置器

   PLC接通電源并開始運(yùn)行后，立即開始進(jìn)行自診斷，自診斷時(shí)間的長短隨用戶程序的長短而變化。自診斷通過后，CPU就對用戶程序進(jìn)行掃描。掃描從0000H地址所存的*條用戶程序開始，順序進(jìn)行，直到用戶程序占有的后一個(gè)地址為止，形成一個(gè)掃描循環(huán)，周而復(fù)始。順序掃描的工作方式簡單直觀，它簡化了程序的設(shè)計(jì)，并為PLC的可靠運(yùn)行提供了保證。一方面所掃描到的指令被執(zhí)行后，其結(jié)果馬上就可以被將要掃描到的指令所利用。另一方面還可以通過CPU設(shè)置掃描時(shí)間監(jiān)視定時(shí)器來監(jiān)視每次掃描是否超過規(guī)定的時(shí)間，從而避免由于CPU內(nèi)部故障使程序執(zhí)行進(jìn)入死循環(huán)而造成的故障。

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