140CPU11303
140CPU11303140CPU11303
PLC的指令是很多的。不同的PLC。指令的條數(shù)也不同。少的幾十條,多的幾百條。指令不同,執(zhí)行的時間也不同。但各種PLC總有一些基本指令,而且各種的PLC都有這些基本指令,故常以執(zhí)行一條基本指令的時間來衡量這個速度。這個時間當(dāng)然越短越好,已從微秒級縮短到零點微秒級。并隨著微處理器技術(shù)的進步,這個時間還在縮短。 PLC之家
【公 司】: 廈門泰尼電氣有限公司
【主 營】: AB、GE、施耐德等各類PLC產(chǎn)品
【價 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門
【座 機】: 0592-6809819
【來 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
執(zhí)行時間短可加快PLC對一般輸入信號的響應(yīng)速度。從討論PLC的工作原理知,從對PLC加入輸入信號,到PLC產(chǎn)生輸出,最理想的情況也要延遲一個PLC運行程序的周期。因為PLC監(jiān)測到輸入信號,經(jīng)運行程序后產(chǎn)生的輸出,才是對輸入信號的響應(yīng)。 不理想時,還要多延長一個周期。當(dāng)輸入信號送入PLC時,PLC的輸入刷新正好結(jié)束,就是這種情況。這時,要多等待一個周期,PLC的輸入映射區(qū)才能接受到這個新的輸入信號。對一般的輸入信號,這個延遲雖可以接受,但對急需響應(yīng)的輸入信號,就不能接受了。對急需處理的輸人信號延遲多長時間PLC能予以響應(yīng),要另作要求。
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