QLVIMBCN產(chǎn)品描述:
監(jiān)控系統(tǒng)示意圖[/align] V80系列PLC采集現(xiàn)場每個(gè)換熱子站的溫度、壓力、流量,并根據(jù)采集數(shù)據(jù)進(jìn)行供熱流量的控制,以達(dá)到節(jié)能的目的。根據(jù)室外氣溫的變化,通過調(diào)節(jié)一級管網(wǎng)電動(dòng)閥門的開度來及時(shí)控制二級管網(wǎng)的回水溫度,通過調(diào)度給定的控制曲線,保證每個(gè)換熱站的運(yùn)行參數(shù)始終在給定的范圍內(nèi)。同時(shí),中央監(jiān)控室根據(jù)需要調(diào)度和遙控子站的電動(dòng)閥門,調(diào)整運(yùn)行參數(shù)。系統(tǒng)配置GPRS DTU,可以實(shí)現(xiàn)溫度的控制、補(bǔ)水泵變頻的遠(yuǎn)程控制。 上位機(jī)選用組態(tài)王組態(tài)軟件,與數(shù)據(jù)庫結(jié)合起來,對所有數(shù)據(jù)進(jìn)行存儲和分析,并可以配合優(yōu)化軟件進(jìn)行優(yōu)先控制。 PLC特點(diǎn) [align=center] 圖2 V80系統(tǒng)結(jié)構(gòu)示意圖[/align] 針對前面提到的各種問題,本文提出了一個(gè)更為優(yōu)勝的方案,其特點(diǎn)如下: 1 網(wǎng)絡(luò)通信功能 V80系列PLC可同時(shí)支持2個(gè)以上的通信口,可利用RS485通信口組建控制網(wǎng)絡(luò),把多臺V80小型PLC組進(jìn)同一個(gè)現(xiàn)場總線網(wǎng)絡(luò)內(nèi),主控PLC上連接一個(gè)GPRS DTU模塊,為監(jiān)控網(wǎng)絡(luò)提供透明的上網(wǎng)通道。 選用GPRS DTU代替無線RTU可以大大降低成本,在敷設(shè)了電話線的地方可選用Modem,使整個(gè)系統(tǒng)的造價(jià)達(dá)到最優(yōu)。 2 CPU模塊功能 M32DT模塊是16路數(shù)字量輸入和16路晶體管輸出的CPU模塊,本身帶有兩個(gè)通信口,一個(gè)RS232和一個(gè)RS485,內(nèi)部帶MODBUS主從通信協(xié)議和FREE通信協(xié)議,可以與各種HMI或者各種組態(tài)軟件通信,通信協(xié)議庫文件使各廠商自行開發(fā)上位機(jī)軟件提供了諸多便利。 M32DT內(nèi)帶FLASH存儲器,可將各種參數(shù)存儲在本地,還帶有掉電保持功能,從而保證使用的可靠性和便利性。高速運(yùn)算速度和完備數(shù)學(xué)運(yùn)算能力使其更適合通信和模擬量處理環(huán)境。 3 抗干擾能力強(qiáng) 整個(gè)系統(tǒng)的寬溫和寬電源供電設(shè)計(jì)使其可以在惡劣的環(huán)境中游刃有余,V80系列產(chǎn)品已通過CE認(rèn)證。 4 編程簡單方便 V80 系列PLC的編程語言支持IEC61131-3標(biāo)準(zhǔn),可以方便編程。同時(shí),支持在線編程,也就是在運(yùn)行態(tài)下可以進(jìn)行程序修改和調(diào)試,為監(jiān)控現(xiàn)場的在線升級和擴(kuò)展提供方便。 5 性價(jià)比高 V80系列PLC比同樣點(diǎn)數(shù)的數(shù)采模塊具有價(jià)格優(yōu)勢,而且其圖形化編程功能使其成為一個(gè)強(qiáng)有力的分布式監(jiān)控平臺。
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