PLC 的掃描過程包含內(nèi)部處理、通信服務(wù)、輸入處理、程序執(zhí)行、輸出 處理 五個(gè)階段,這五個(gè)階段掃描一次所需的時(shí)間稱為掃描周期。
掃描周期與 CPU 運(yùn)行速度、 PLC 硬件配置和用戶程序長(zhǎng)短有關(guān)。
聯(lián)系人：王卿
電話：18150117686
座機(jī)：0592-5856213
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（1） 控制方法上:PLC 采用程序方式實(shí)現(xiàn)控制, 容易改變或增加控制要求, 且 PLC 的觸點(diǎn)無限;
（2）工作方式上:PLC 采用串行工作方式,提高系統(tǒng)的抗干擾能力;
（3）控制速度上:PLC 的觸點(diǎn)實(shí)際上是觸發(fā)器,指令執(zhí)行的時(shí)間在微秒級(jí);
（4） 定時(shí)和計(jì)數(shù)上:PLC 采用半導(dǎo)體集成電路作定時(shí)器, 時(shí)鐘脈沖由晶振提供,延時(shí) 精度高,范圍寬。PLC 具有繼電器系統(tǒng)不具備的計(jì)數(shù)功能;
（5）可靠性和可維護(hù)性上:PLC 采用微電子技術(shù),可靠性高,所具有的自檢功能能 及時(shí)查出
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