SDCS-PIN-22 |
聯(lián)系人:許小燕 (小姐) | 手機(jī):15359408275 |
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郵箱:2851677685@qq.com | 地址:廈門市思明區(qū)湖濱南路388號(hào)國(guó)貿(mào)大廈32D單元 |
SDCS-PIN-22SDCS-PIN-22SDCS-PIN-22PLC 的掃描過(guò)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 QQ:2851195464
(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(wú)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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