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1746-IV16
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多臺(tái)PLC 與工控PC 并行聯(lián)網(wǎng) 工控PC 能夠深入地配合PLC 廠商提供的各種軟件，從而實(shí)現(xiàn)更多強(qiáng)大的功能，比如系統(tǒng)配置、人機(jī)界面、組態(tài)開發(fā)等，在PLC 領(lǐng)域的作用也越來越不可或缺。通常，工控PC與單臺(tái)PLC 通過1 個(gè)串口連接通訊，實(shí)現(xiàn)各種擴(kuò)展功能；但串口的通訊距離、節(jié)點(diǎn)數(shù)量都受到了串口本身的性能限制。比如，RS-232 標(biāo)準(zhǔn)只可以實(shí)現(xiàn)“點(diǎn)－點(diǎn)”通訊，RS-485/422標(biāo)準(zhǔn)能夠?qū)崿F(xiàn)32 個(gè)節(jié)點(diǎn)以內(nèi)的通訊，但通訊距離、抗干擾能力都比較弱，并不能夠滿足實(shí)際工業(yè)現(xiàn)場(chǎng)多臺(tái)PLC 聯(lián)網(wǎng)應(yīng)用的需求。 工控PC 內(nèi)置PC-CAN 接口卡，可以建立起1 條或者多條現(xiàn)場(chǎng)總線CAN-bus 網(wǎng)絡(luò)，并通過連接在CAN-bus 網(wǎng)絡(luò)中的網(wǎng)關(guān)RS-232/RS-485 轉(zhuǎn)CAN-bus 轉(zhuǎn)換器，借助于CAN-bus 網(wǎng)絡(luò)配套的“虛擬串口”軟件，建立多達(dá)2047 個(gè)標(biāo)準(zhǔn)的串行通訊端口，從而連接多達(dá)2047條串行網(wǎng)絡(luò)。也就是說，可以在同1 條普通雙絞線上連接多達(dá)2047 臺(tái)PLC 設(shè)備，工控PC訪問連接在這條CAN-bus 網(wǎng)絡(luò)上的PLC 設(shè)備，也與操作標(biāo)準(zhǔn)串口完全一致。這種方式可以充分發(fā)揮工控PC 的作用，通訊效率也比較高。 通過工控PC 組建多臺(tái)PLC 網(wǎng)絡(luò)的系統(tǒng)結(jié)構(gòu)如圖 2 所示。按這一種方式的建立PLC 網(wǎng) 絡(luò)的通訊效率較高，應(yīng)用靈活，是一般PLC 網(wǎng)絡(luò)建設(shè)的主流方向。 [align=center]
圖 2 多臺(tái)PLC 與工控PC 并行聯(lián)網(wǎng)[/align]
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