描述
為了提高PLC控制系統(tǒng)工作的可靠性，可以專門設(shè)置一個定時器，作為監(jiān)控程序部分，對系統(tǒng)的運(yùn)行狀態(tài)進(jìn)行檢測。若程序運(yùn)行能正常結(jié)束，則該定時器就立即被清零；若程序運(yùn)行發(fā)生故障，如出現(xiàn)死循環(huán)等，該定時器在設(shè)定的時間到就無法清零，此時PLC發(fā)出報警信號。在設(shè)計應(yīng)用程序時，使用這種方法來實現(xiàn)對系統(tǒng)各部分運(yùn)行狀態(tài)的監(jiān)控。如果用PLC來控制某一對象時，編制程序時可定義一個定時器來對這一對象的運(yùn)行狀態(tài)進(jìn)行監(jiān)視：該定時器的設(shè)定時間即為這一對象工作所需的最大時間；當(dāng)啟動該對象運(yùn)行時，同時也啟動該定時器。若該對象的運(yùn)行程序在規(guī)定的時間結(jié)束工作，發(fā)出一個工作完成信號，使該定時器清零，說明這一對象的運(yùn)行程序正常；否則，屬運(yùn)行不正常，發(fā)出報警信號或停機(jī)信號。監(jiān)控程序的梯形圖如圖7所示。圖7中定時器T1為檢測元件，X001為控制對象動作信號，X002為動作完成信號，M2為報警或停機(jī)信號。假設(shè)被控對象的運(yùn)行程序完成一次循環(huán)需要50s，則定時器K值可取510（T1為100ms定時器）。當(dāng)X001=1時，被控對象運(yùn)行開始，T1開始計時；如在規(guī)定的時間內(nèi)被控對象的運(yùn)行程序能正常結(jié)束，則X002動作，M1復(fù)位，定時器T1被清零，等待下一次循環(huán)的開始；若在規(guī)定時間沒有發(fā)出被控對象運(yùn)行完成的動作信號，則判斷為故障，T1的觸點(diǎn)閉合，接通M2發(fā)出報警信號或停機(jī)信號。
歐美品牌停產(chǎn)的，常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域：
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列
本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。
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