詳細(xì)內(nèi)容：ABL8RED24400 工作原理 編輯 當(dāng)PLC投入運(yùn)行后，其工作過(guò)程一般分為三個(gè)階段，即輸入采樣、用戶程序執(zhí)行和輸出刷新三個(gè)階段。完成上述三個(gè)階段稱作一個(gè)掃描周期。在整個(gè)運(yùn)行期間，PLC的CPU以一定的掃描速度重復(fù)執(zhí)行上述三個(gè)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(yīng)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(gè)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(yīng)單元的狀態(tài)和數(shù)據(jù)也不會(huì)改變。因此，如果輸入是脈沖信號(hào)，則該脈沖信號(hào)的寬度必須大于一個(gè)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(shí)，又總是先掃描梯形圖左邊的由各觸點(diǎn)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(diǎn)構(gòu)成的控制線路進(jìn)行邏輯運(yùn)算，然后根據(jù)邏輯運(yùn)算的結(jié)果，刷新該邏輯線圈在系統(tǒng)RAM存儲(chǔ)區(qū)中對(duì)應(yīng)位的狀態(tài)；或者刷新該輸出線圈在I/O映象區(qū)中對(duì)應(yīng)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(guò)程中，只有輸入點(diǎn)在I/O映象區(qū)內(nèi)的狀態(tài)和數(shù)據(jù)不會(huì)發(fā)生變化，而其他輸出點(diǎn)和軟設(shè)備在I/O映象區(qū)或系統(tǒng)RAM存儲(chǔ)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(huì)對(duì)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(gè)掃描周期才能對(duì)排在其上面的程序起作用。 輸出刷新 當(dāng)掃描用戶程序結(jié)束后，PLC就進(jìn)入輸出刷新階段。在此期間，CPU按照I/O映象區(qū)內(nèi)對(duì)應(yīng)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(dòng)相應(yīng)的外設(shè)。這時(shí)，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(yùn)行結(jié)果與繼電器控制裝置的硬邏輯并行運(yùn)行的結(jié)果有所區(qū)別。當(dāng)然，如果掃描周期所占用的時(shí)間對(duì)整個(gè)運(yùn)行來(lái)說(shuō)可以忽略，那么二者之間就沒(méi)有什么區(qū)別了。 保養(yǎng) 編輯 設(shè)備定期測(cè)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(dòng)的地方及時(shí)重新堅(jiān)固連接； （2） 對(duì)柜中給主機(jī)供電的電源每月重新測(cè)量工作電壓； 設(shè)備定期清掃 （1） 每六個(gè)月或季度對(duì)PLC進(jìn)行清掃，切斷給PLC供電的電源把電源機(jī)架、CPU主板及輸入/輸出板依次拆下，進(jìn)行吹掃、清掃后再依次原位安裝好，將全部連接恢復(fù)后送電并啟動(dòng)PLC主機(jī)。認(rèn)真清掃PLC箱內(nèi)衛(wèi)生； （2） 每三個(gè)月更換電源機(jī)架下方過(guò)濾網(wǎng)； 檢修前準(zhǔn)備 （1） 檢修前準(zhǔn)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(hù)裝置及認(rèn)真作防靜電準(zhǔn)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(jī)檢修，必須兩個(gè)人以上監(jiān)護(hù)操作； （2） 把CPU前面板上的方式選擇開(kāi)關(guān)從“運(yùn)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(hào)及連接位置后拆下，然后拆下電源機(jī)架與機(jī)柜相連的螺絲，電源機(jī)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(shí)以相反順序進(jìn)行； 檢修工藝及技術(shù)要求 （1） 測(cè)量電壓時(shí)，要用數(shù)字電壓表或精度為1%的萬(wàn)能表測(cè)量 （2）電源機(jī)架，CPU主板都只能在主電源切斷時(shí)取下； （3） 在RAM模塊從CPU取下或插入CPU之前，要斷開(kāi)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?xí)r取下模塊RAM內(nèi)容將丟失； （5） 輸入/輸出板取下前也應(yīng)先關(guān)掉總電源，但如果生產(chǎn)需要時(shí)I/0板也可在可編程控制器運(yùn)行時(shí)取下，但CPU板上的QVZ（超時(shí)）燈亮； （6） 撥插模板時(shí)，要格外小心，輕拿輕放，并運(yùn)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. Interface 705354 79A Reliance Electric 57C492 Battery Backup Unit PLC B/M 803623-R M/N 803623R RELIANCE ELECTRIC 57C-427 57C427 Reliance Electric 57C422B Reliance Electric 57C420 57420 32-Channel 5-24VDC Output Module J-3633 Reliance Electric 57C419 57419-1B 32-Channel Input Module 5-24 VDC J-3632-2 Reliance Electric 57C419 57419-1B 32-Channel 5-24VDC Input Module J-3632 RELIANCE ELECTRIC 57C419 5-24V DC INPUT MODULE 57419-1B S-67107-1A 57419 Reliance Electric 57C411 Resolver Input Module 0-57411-2J - Refurbished RELIANCE ELECTRIC 57C411 RESOLVER INPUT MODULE Reliance Electric 57C409-H 2-Channel Analog Input Module Reliance Electric 57C404C Network Communications Automax Network Module 0574043A Reliance Electric 57C404B 57C-404B Module 57404-2F 0-57404 - Refurbished Reliance Electric 57C404A 57C404 57404-2 Network Communications PLC AutoMax Reliance Electric 57C404 Communication Module Reliance Electric 57C403-G High Output Module, 16-Channel, 115VAC Reliance Electric 57C402 Output Module Reliance Electric 57C380 Passive Tap RELIANCE ELECTRIC 57C370 16 DIGIT CONNECTOR * IN A BOX* RELIANCE ELECTRIC 57552-4 Reliance Electric 57412 Field Regulator Module Reliance Electric 57411-2 Resolver Input Module Reliance Electric 57409 Isolated Control Reliance Electric 57407-4J DCS Processor - Parts Only Reliance Electric 57407-4J CPU Module Reliance Electric 57407-4J 0574074J DCS Processor 57407-4 - RELIANCE ELECTRIC 57407-4J * * RELIANCE ELECTRIC 57405-E 57405 DRIVE ANALOG I/O MODULE Reliance Electric 57405-E 0- Analog I/O Drive Module O- - RELIANCE ELECTRIC 57403-E B/M DISTRIBUTION CONTROL SYSTEM Reliance Electric 57403 High Output Module RELIANCE ELECTRIC 57403 115 V AC HIGH OUTPUT 0-57403-E MODULE RELIANCE ELECTRIC 56313-1 INTERFACE PROCESS CONTROL Reliance Electric 5614 Reeves Vari-Speed Motor Pulley Mount Base Adjustable RELIANCE ELECTRIC 5533216 FUSE FERRAZ PROTISTOR F300178 STOCK*K590 RELIANCE ELECTRIC 5-24VDC DC OUTPUT MODULE 57420 RELIANCE ELECTRIC 5-24VDC 32 CHANNEL INPUT 57419-1 RELIANCE ELECTRIC 5-24V DC OUTPUT MODULE PLC 57420 57-420 S-67106A RELIANCE ELECTRIC 5-24V DC INPUT MODULE PLC 57419-1 57-419-1 S-67107-1A RELIANCE ELECTRIC 51381-13 0-51381-13 FLEXPAK CONTROL BOARD REMANNED AND TESTED RELIANCE ELECTRIC 50K POTENTIOMETER NIB 402374-B 102170 Reliance Electric 4RC034 Controller To Terminal Board Sequencing Cable 3ft RELIANCE ELECTRIC 4-CHANNEL 4CH ANALOG OUTPUT MODULE 57C410A 57C-410A 0-57410-1C RELIANCE ELECTRIC 49458-J 49458J RELIANCE ELECTRIC 49458-H 49458H RELIANCE ELECTRIC 48267-B 48267B RELIANCE ELECTRIC 45C98 ENHANCED MEMORY MODULE *NICE* RELIANCE ELECTRIC 45C98 AUTOMATE ENHANCED MEMORY MODULE RELIANCE ELECTRIC 45C-966 45C966 Reliance Electric 45C964 RELIANCE ELECTRIC 45C71 COAX BNC 75OHM LOAD * IN A BOX* RELIANCE ELECTRIC 45C-70 45C70 RELIANCE ELECTRIC 45C-66A 45C66A RELIANCE ELECTRIC 45C-66 45C66 RELIANCE ELECTRIC 45C-65 45C65 Reliance Electric 45C63 Output Module, AutoMate Dual 24VDC, 2A RELIANCE ELECTRIC 45C63 DUAL 24V DC2A OUTPUT * * Reliance Electric 45C63 Automate Dual 24DC Output Module Reliance Electric 45C50 Dual Input Module Reliance Electric 45C46 Input Module RELIANCE ELECTRIC 45C-44 45C44 Reliance Electric 45C44 AutoMate Dual 24V AC/DC Input Module Circuit Rev1 * * RELIANCE ELECTRIC 45C-42 45C42 RELIANCE ELECTRIC 45C42 DUAL INPUT MODULE ELECTRONIC * IN A BOX* Reliance Electric 45C41 Reliance Electric 45C40 Input Module RELIANCE ELECTRIC 45C40 DUAL INPUT MODULE 115VAC/DC * IN A BOX* Reliance Electric 45C40 Dual Input Module RELIANCE ELECTRIC 45C40 DUAL 115 VAC/DC INPUT--SA Reliance Electric 45C40 Automate Input Module AC/DC RELIANCE ELECTRIC 45C-3-EACH 45C3EACH RELIANCE ELECTRIC 45C1A PROGRAMMABLE CONTROLLER 802802-7RD * * RELIANCE ELECTRIC 45C1A AUTOMATE CONTROLLER Reliance Electric 45C166A Output Module, AutoMate Dual 3A RELIANCE ELECTRIC 45C166 * OUT OF BOX* RELIANCE ELECTRIC 45C-108 45C108 RELIANCE ELECTRIC 447-9069 (76624-V) RELAY * OUT OF A BOX* RELIANCE ELECTRIC 447-9047 (76624-W) POLE RELAY * OUT OF A BOX* RELIANCE ELECTRIC 447-9045 (46624-T) RELAY * OUT OF A BOX* RELIANCE ELECTRIC 447-9044 (46624-S) RELAY * OUT OF A BOX* RELIANCE ELECTRIC 447 447 Reliance Electric 425.06.03 Resistor 425.06.03 * in Box* Reliance Electric 424360-EY Motor .5HP, 1725RPM, 3PH, 230/460V Gearbox 445214-FY RELIANCE ELECTRIC 422962-51AL 42296251AL RELIANCE ELECTRIC 422016-RA 422016RA RELIANCE ELECTRIC 419953-1A COUPLING IN BOX!! 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