ABL8RED24400

詳細內(nèi)容：ABL8RED24400 工作原理 編輯 當PLC投入運行后，其工作過程一般分為三個階段，即輸入采樣、用戶程序執(zhí)行和輸出刷新三個階段。完成上述三個階段稱作一個掃描周期。在整個運行期間，PLC的CPU以一定的掃描速度重復執(zhí)行上述三個階段。 輸入采樣 在輸入采樣階段，PLC以掃描方式依次地讀入所有輸入狀態(tài)和數(shù)據(jù)，并將它們存入I/O映象區(qū)中的相應得單元內(nèi)。輸入采樣結(jié)束后，轉(zhuǎn)入用戶程序執(zhí)行和輸出刷新階段。在這兩個階段中，即使輸入狀態(tài)和數(shù)據(jù)發(fā)生變化，I/O映象區(qū)中的相應單元的狀態(tài)和數(shù)據(jù)也不會改變。因此，如果輸入是脈沖信號，則該脈沖信號的寬度必須大于一個掃描周期，才能保證在任何情況下，該輸入均能被讀入。 用戶程序執(zhí)行 在用戶程序執(zhí)行階段，PLC總是按由上而下的順序依次地掃描用戶程序(梯形圖)。在掃描每一條梯形圖時，又總是先掃描梯形圖左邊的由各觸點構(gòu)成的控制線路，并按先左后右、先上后下的順序?qū)τ捎|點構(gòu)成的控制線路進行邏輯運算，然后根據(jù)邏輯運算的結(jié)果，刷新該邏輯線圈在系統(tǒng)RAM存儲區(qū)中對應位的狀態(tài)；或者刷新該輸出線圈在I/O映象區(qū)中對應位的狀態(tài)；或者確定是否要執(zhí)行該梯形圖所規(guī)定的特殊功能指令。 即，在用戶程序執(zhí)行過程中，只有輸入點在I/O映象區(qū)內(nèi)的狀態(tài)和數(shù)據(jù)不會發(fā)生變化，而其他輸出點和軟設(shè)備在I/O映象區(qū)或系統(tǒng)RAM存儲區(qū)內(nèi)的狀態(tài)和數(shù)據(jù)都有可能發(fā)生變化，而且排在上面的梯形圖，其程序執(zhí)行結(jié)果會對排在下面的凡是用到這些線圈或數(shù)據(jù)的梯形圖起作用；相反，排在下面的梯形圖，其被刷新的邏輯線圈的狀態(tài)或數(shù)據(jù)只能到下一個掃描周期才能對排在其上面的程序起作用。 輸出刷新 當掃描用戶程序結(jié)束后，PLC就進入輸出刷新階段。在此期間，CPU按照I/O映象區(qū)內(nèi)對應的狀態(tài)和數(shù)據(jù)刷新所有的輸出鎖存電路，再經(jīng)輸出電路驅(qū)動相應的外設(shè)。這時，才是PLC的真正輸出。 同樣的若干條梯形圖，其排列次序不同，執(zhí)行的結(jié)果也不同。另外，采用掃描用戶程序的運行結(jié)果與繼電器控制裝置的硬邏輯并行運行的結(jié)果有所區(qū)別。當然，如果掃描周期所占用的時間對整個運行來說可以忽略，那么二者之間就沒有什么區(qū)別了。 保養(yǎng) 編輯 設(shè)備定期測試、調(diào)整 （1） 每半年或季度檢查PLC柜中接線端子的連接情況，若發(fā)現(xiàn)松動的地方及時重新堅固連接； （2） 對柜中給主機供電的電源每月重新測量工作電壓； 設(shè)備定期清掃 （1） 每六個月或季度對PLC進行清掃，切斷給PLC供電的電源把電源機架、CPU主板及輸入/輸出板依次拆下，進行吹掃、清掃后再依次原位安裝好，將全部連接恢復后送電并啟動PLC主機。認真清掃PLC箱內(nèi)衛(wèi)生； （2） 每三個月更換電源機架下方過濾網(wǎng)； 檢修前準備 （1） 檢修前準備好工具； （2） 為保障元件的功能不出故障及模板不損壞，必須用保護裝置及認真作防靜電準備工作； （3） 檢修前與調(diào)度和操作工聯(lián)系好，需掛檢修牌處掛好檢修牌； 設(shè)備拆裝順序及方法 （1） 停機檢修，必須兩個人以上監(jiān)護操作； （2） 把CPU前面板上的方式選擇開關(guān)從“運行”轉(zhuǎn)到“�！蔽恢�； （3） 關(guān)閉PLC供電的總電源，然后關(guān)閉其它給模坂供電的電源； （4） 把與電源架相連的電源線記清線號及連接位置后拆下，然后拆下電源機架與機柜相連的螺絲，電源機架就可拆下； （5） CPU主板及I/0板可在旋轉(zhuǎn)模板下方的螺絲后拆下； （6） 安裝時以相反順序進行； 檢修工藝及技術(shù)要求 （1） 測量電壓時，要用數(shù)字電壓表或精度為1%的萬能表測量 （2）電源機架，CPU主板都只能在主電源切斷時取下； （3） 在RAM模塊從CPU取下或插入CPU之前，要斷開PC的電源，這樣才能保證數(shù)據(jù)不混亂； （4） 在取下RAM模塊之前，檢查一下模塊電池是否正常工作，如果電池故障燈亮時取下模塊RAM內(nèi)容將丟失； （5） 輸入/輸出板取下前也應先關(guān)掉總電源，但如果生產(chǎn)需要時I/0板也可在可編程控制器運行時取下，但CPU板上的QVZ（超時）燈亮； （6） 撥插模板時，要格外小心，輕拿輕放，并運離產(chǎn)生靜電的物品； （7） 更換元件不得帶電操作； （8） 檢修后模板安裝一定要安插到位 RELIANCE ELECTRIC 600434-37V 60043437V RELIANCE ELECTRIC 600434-33V 60043433V Reliance Electric 6 Slot Rack 45C913 Reliance Electric 5mA - 50mA Inst. 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