MeridianNT7D19AA真空計(jì)
通訊口已經(jīng)設(shè)置完畢，下面就是如何根據(jù)要求將數(shù)據(jù)發(fā)送給變頻器。


對(duì)FX2系列的PLC與上拉機(jī)的通信實(shí)現(xiàn)，提出了一種價(jià)格低、體積小的接口方案，討論了其硬件和軟件的設(shè)計(jì)思想，該接口裝置與控制室和實(shí)驗(yàn)室環(huán)境下運(yùn)行可靠。


關(guān)鍵詞：上位機(jī)通信接口可編程控制器


PLC作為一種高能的控制裝置，在分布式系統(tǒng)中得到了越來(lái)越廣泛的應(yīng)用。在這種控制方式中，上位機(jī)系統(tǒng)是其中重要的組成部分。PLC可以多種方式如直接采用現(xiàn)有的組態(tài)軟件與上位監(jiān)迭機(jī)通信，但針對(duì)小規(guī)模的控制系統(tǒng)，找到一種高能價(jià)格比的通信方法，


1通信裝置的硬件描述


之間實(shí)現(xiàn)通道，可使二者互補(bǔ)功能上的不足，PLC用于控制方面既方便又可靠，而PC機(jī)在圖形顯示、數(shù)據(jù)處理、打印報(bào)表以及中文顯示等方面有很強(qiáng)的功能。因此，各PLC制造廠家紛紛開(kāi)發(fā)了適用于本公司的各種型號(hào)PLC與PC機(jī)通信的接口模塊。三菱公司開(kāi)發(fā)的FX-232AW接口模塊用于FX2系列PLC與計(jì)算機(jī)通信。還有與以太網(wǎng)連接的接口模塊AJ71E71、與MAP網(wǎng)連接的接口模塊AJ71M51-S1、與FAIS MAP網(wǎng)連接的接口模塊AJ71M51M1等。不同的通信方式，有著不同的成本價(jià)格和不同的適用范圍。在此介紹一種通過(guò)PC機(jī)的RS-232口與PLC進(jìn)行通信的實(shí)現(xiàn)方法。


FX2系列PLC的編程接口采用RS-422標(biāo)準(zhǔn)，而計(jì)算機(jī)的串行口采用RS-232標(biāo)準(zhǔn)。因此，作為實(shí)現(xiàn)PLC計(jì)算機(jī)通信的接口電路，必須將RS-422標(biāo)準(zhǔn)轉(zhuǎn)換成RS-232標(biāo)準(zhǔn)。

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