IC693CPU331CE
遠(yuǎn)程監(jiān)控只具備數(shù)據(jù)采集功能，在需要實(shí)時(shí)控制和數(shù)據(jù)處理時(shí)，會(huì)顯得力不從心。PLC 作為工業(yè)控制的核心部件，其在網(wǎng)絡(luò)、通信等方面的能力越來越強(qiáng)，具備遠(yuǎn)程監(jiān)控要求的數(shù)據(jù)采集、實(shí)時(shí)控制和數(shù)據(jù)處理功能。隨著國產(chǎn) PLC 市場占有量的提升，PLC 的價(jià)格也比以前更具優(yōu)勢(shì)，使用 PLC 做 DAS系統(tǒng)或者用 PLC 平臺(tái)開發(fā)數(shù)據(jù)采集系統(tǒng)將是大勢(shì)所趨或者說相當(dāng)有吸引力的選擇。德維森公司的 V80 小型 PLC 在供熱、交通監(jiān)控、樓宇監(jiān)控等行業(yè)有許多的成功應(yīng)用. 下面以其在東北某供熱網(wǎng)監(jiān)控為例說明 PLC 在數(shù)據(jù)采集和遠(yuǎn)程監(jiān)控行業(yè)中的應(yīng)用。 遠(yuǎn)程監(jiān)控系統(tǒng) 供熱網(wǎng)遠(yuǎn)程監(jiān)控系統(tǒng)的示意圖如下： [align=center]
圖1 供熱網(wǎng)遠(yuǎn)程監(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(jí)管網(wǎng)電動(dòng)閥門的開度來及時(shí)控制二級(jí)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(duì)所有數(shù)據(jù)進(jìn)行存儲(chǔ)和分析，并可以配合優(yōu)化軟件進(jìn)行優(yōu)先控制。
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