Woodward 9907-162
工作速度是指PLC的CPU執(zhí)行指令的速度及對(duì)急需處理的輸入信號(hào)的響應(yīng)速度。工作速度是PLC工作的基礎(chǔ)。速度高了,才可能通過(guò)運(yùn)行程序?qū)崿F(xiàn)控制,才可能不斷擴(kuò)大控制規(guī)模,才可能發(fā)揮PLC的多種多樣的作用。
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(shí)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(shí)間來(lái)衡量這個(gè)速度。這個(gè)時(shí)間當(dāng)然越短越好,已從微秒級(jí)縮短到零點(diǎn)微秒級(jí)。并隨著微處理器技術(shù)的進(jìn)步,這個(gè)時(shí)間還在縮短。 PLC之家
執(zhí)行時(shí)間短可加快PLC對(duì)一般輸入信號(hào)的響應(yīng)速度。從討論P(yáng)LC的工作原理知,從對(duì)PLC加入輸入信號(hào),到PLC產(chǎn)生輸出,理想的情況也要延遲一個(gè)PLC運(yùn)行程序的周期。因?yàn)镻LC監(jiān)測(cè)到輸入信號(hào),經(jīng)運(yùn)行程序后產(chǎn)生的輸出,才是對(duì)輸入信號(hào)的響應(yīng)。 不理想時(shí),還要多延長(zhǎng)一個(gè)周期。當(dāng)輸入信號(hào)送入PLC時(shí),PLC的輸入刷新正好結(jié)束,就是這種情況。這時(shí),要多等待一個(gè)周期,PLC的輸入映射區(qū)才能接受到這個(gè)新的輸入信號(hào)。對(duì)一般的輸入信號(hào),這個(gè)延遲雖可以接受,但對(duì)急需響應(yīng)的輸入信號(hào),就不能接受了。對(duì)急需處理的輸人信號(hào)延遲多長(zhǎng)時(shí)間PLC能予以響應(yīng),要另作要求。
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