2090-CFBM7DF-CEAF05 2090-CFBM7DF-CEAF05 2090-CFBM7DF-CEAF05 2090-CFBM7DF-CEAF05 2090-CFBM7DF-CEAF05 2090-CFBM7DF-CEAF05
PLC的維護與檢查如何做？
雖然PLC的故障率很低，由PLC構(gòu)成的控制系統(tǒng)可以長期穩(wěn)定和可靠的工作，但對它進行維護和檢查是必不可少的。一般每半年應對PLC系統(tǒng)進行一次周期性檢查。檢修內(nèi)容包括：
（1）供電電源。 查看PLC的供電電壓是否在標準范圍內(nèi)。交流電源工作電壓的范圍為85～264V，直流電源電壓應為24V。
（2）環(huán)境條件。 查看控制柜內(nèi)的溫度是否在0～55℃范圍內(nèi)，相對濕度在35%-85%范圍內(nèi)，以及無粉塵、鐵屑等積塵。
（3）安裝條件。 連接電纜的連接器是否完全插入旋緊，螺釘是否松動，各單元是否可靠固定、有無松動。
（4）I/O端電壓。 均應在工作要求的電壓范圍內(nèi)。
電廠化學水處理系統(tǒng)作為電廠重要的輔助車間和輔助系統(tǒng)，特別是大型火電廠利和供熱電廠的化水處理車間處理量大，工藝復雜，水質(zhì)要求高，其運營的好壞直接關系到電廠的安全運行及可靠性。本文以筆者負責完成的通遼盛發(fā)熱電廠化學水處理程控系統(tǒng)項目，分析化學水處理程控系統(tǒng)的自動控制。
2 化學水處理系統(tǒng)工藝流程
通遼盛發(fā)熱電廠作為新建熱電廠新建4臺機組（4×135MW，分兩期完成），化學水處理系統(tǒng)由三部分組成:軟化水處理系統(tǒng)、反滲透系統(tǒng)和除鹽水系統(tǒng),系統(tǒng)工藝流程簡圖
系統(tǒng)主工藝流程為：工業(yè)水→曝氣塔→曝氣水箱→升壓水泵→疊加式過濾器→陽離子交換器→除二氧化碳器→軟化水箱→堿計量泵加堿→軟化水泵升壓（軟化水，可作為廠內(nèi)生活用水）→加熱器→反滲透裝置→反滲透水箱→反滲透水泵升壓→一級混合離子交換器→二級混合離子交換器→除鹽水箱→除鹽水泵升壓→主廠房。
3 控制系統(tǒng)硬件組成
3．1 PLC控制系統(tǒng)
根據(jù)裝置工作要求，選用性價高的AB公司的Controllogix系列可編程控制器構(gòu)建冗余的控制系統(tǒng)。PLC中CPU采用兩套1756－L55 ControlLogix5555 Controller，設置1個主站（CPU模件），5個分站(IO模件)，主站CPU與分站I/O通過ControlNet網(wǎng)絡通訊, 開關量輸入、輸出模件選用32點，模擬量輸入模件選用16點，模擬量輸出選用8點。
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（一）Allen Bradley ROCKWELL-羅克韋爾 AB
（二）Reliance瑞恩、SLC500/1747/1746、MicroLogix/1761/1763/1762/1766/1764、CompactLogix/1769/1768、Logix5000/1756/1789/1794/1760/1788、PLC-5/1771/1785
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（五）ABB工業(yè)機器人備件DSQC系列、Bailey INFI 90
（六）型號 終端塊61031 546149546150 546152 546181 549802 54043
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（九）MOTOROLA（摩托羅拉）MVME 162、MVME 167、MVME1772、MVME177系列AMC-S302 AMC-S320 AMC-S402 AMC-S502 AMC-S602 ……等
（十）SIEMENS (西門子）Siemens MOORE Siemens Simatic C1Siemens S5SiemensSiemens S7Siemens TIC74040.A24.C187.185 Siemens S5-S3 Siemens
C74040……等
（十一）HONEYWELL(霍尼韋爾）TDC系列8240852230731808-001 4DP7APX0A211G82407021-00151303979-100 QCS系列UNITEC POWER SUPPLYUAPUCMPIDPPIPAIP S9000 系列
（十二）GE FANUC (發(fā)那科）模塊、卡件、驅(qū)動器等各類備件。
（十三）OVATION-艾默生伺服控制器、伺服馬達、伺服驅(qū)動器。
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（十五）Bosch Rexroth（博世力士樂）Indramat，I/O模塊,PLC控制器,驅(qū)動模塊等。
（十六）Westinghouse（西屋） OVATION系統(tǒng)、WDPF系統(tǒng)、WEStation系統(tǒng)備件。
（十七）XYCOM I/O 、VME板和處理器等。
（十八）OMRON（歐姆龍）YOKOGAWA (橫河）YASKAWA(安川）TOSHIBA（東芝）HITACHI(日立）
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