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PLC可編程控制器的特點(diǎn)
1)、可靠性高,抗*力強(qiáng)。工業(yè)生產(chǎn)一般對(duì)控制設(shè)備的可靠性要求很高,并且要有很強(qiáng)的抗*力。PLC能在惡劣的環(huán)境中可靠的工作,平均*時(shí)間達(dá)到數(shù)萬小時(shí)以上,已被*為zui可靠的工業(yè)控制設(shè)備之一。
PLC本身具有較強(qiáng)的自診斷功能,保證硬件核心設(shè)備(CPU、存儲(chǔ)器、I/O總線等)在正常情況下執(zhí)行用戶程序,一旦出現(xiàn)故障則立即給出出錯(cuò)信號(hào),停止用戶程序的執(zhí)行,切斷所有輸出信號(hào),等待修復(fù)。PLC的主要模塊均采用大規(guī)模和超大規(guī)模集成電路,I/O系統(tǒng)設(shè)計(jì)有完善的通道保護(hù)與信號(hào)調(diào)理電路。在結(jié)構(gòu)上對(duì)耐熱、防潮、防塵、抗震等都有精確的考慮,在硬件上采用隔離,屏蔽、濾波、接地等抗干擾措施,在軟件上采用數(shù)字濾波等措施。與繼電器系統(tǒng)和通用計(jì)算機(jī)相比,PLC更能適應(yīng)工業(yè)現(xiàn)場(chǎng)環(huán)境要求。
2) 硬件配套齊全,使用方便,適應(yīng)性強(qiáng)
PLC是通過執(zhí)行程序?qū)崿F(xiàn)控制的。當(dāng)控制要求發(fā)生改變時(shí),只要修改程序即可,zui大限度地縮短了工藝更新所需要的時(shí)間。PLC的產(chǎn)品已標(biāo)準(zhǔn)化、系列化、模塊化,而且PLC及配套產(chǎn)品的模塊品種多,用戶可以靈活方便地進(jìn)行系統(tǒng)配置組合成各種不同規(guī)模、不同功能的控制系統(tǒng)。在PLC控制系統(tǒng)中,只需在PLC的端子上接入相應(yīng)的輸入/輸出信號(hào)線即可,不需要進(jìn)行大量且復(fù)雜的硬接線,并且PLC有較強(qiáng)的帶負(fù)載能力,可以直接驅(qū)動(dòng)一般的電磁閥和交流接觸器。
鄭娟萍
廈門仲鑫航自動(dòng)化設(shè)備有限公司
3)、編程直觀、易學(xué)易會(huì)
PLC提供了多種編程語言,其中梯形圖使用zui普遍。PLC是面向用戶的設(shè)備,PLC的設(shè)計(jì)者充分考慮到現(xiàn)場(chǎng)工程技術(shù)人員的技能和習(xí)慣,因此PLC程序的編制采用梯形圖的簡(jiǎn)單指令形式。梯形圖與繼電原理圖相似,這種編程語言形象直觀,易學(xué)易懂,不需要專門的計(jì)算機(jī)知識(shí)和語言,現(xiàn)場(chǎng)工程技術(shù)人員可在短時(shí)間內(nèi)學(xué)會(huì)使用。用戶在購(gòu)買PLC后,只需按說明書的提示,做少量的接線和進(jìn)行簡(jiǎn)易的用戶程序編制工作,就可靈活方便地將PLC應(yīng)用于生產(chǎn)實(shí)踐。
RELIANCE 06DH BRUSHES (BOX OF 6) ***NIB***
RELIANCE 3141-GS BRUSHES (BOX OF 6) ***NIB***
INGERSOLL-RAND F1529IH/85565471 AIR FILTER ***NIB***
RELIANCE 404844-DA BRUSHES (BOX OF 8) ***NIB***
RELIANCE 3141-GS BRUSHES (BOX OF 8) ***NIB***
INGERSOLL-RAND 22627020 AIR FILTER ***NIB***
INGERSOLL-RAND F108IGX/85567162 AIR FILTER ****NIB****
INGERSOLL-RAND F71IHX/85567139 AIR FILTER ***NIB***
INGERSOLL-RAND F71IGX/85567121 AIR FILTER ***NIB***
ALLEN BRADLEY 1775-S4A I/O SCANNER ***XLNT***
RELIANCE 251.88.07R TRANSFORMER ***XLNT***
ALLEN BRADLEY 1775-L2 MAIN PROCESSOR MODULE ***XLNT***
ALLEN BRADLEY 1771AD CHASSIS RACK ***XLNT***
CLAROSTAT VK100N200 RESISTOR 100W 200 OHM ****NIB****
RELIANCE 0-58710-5/0587105/O-58710-5 TERMINAL PC BOARD ***XLNT***
RELIANCE 0-58707-5/058707-5/0587075/O-58707-5 TERMINAL PC BOARD ***XLNT***
RELIANCE 0-58706-4/0587064/O-58706-4 MAXPAK III DV/DT BOARD ***XLNT***
ALLEN BRADLEY 1395-110996 ARMATURE PULSE BOARD **XLNT**
BALMAC 140T-1 VIBRATION TRANSMITTER SENSOR ***NNB***
EMERSON 2200-4065 SIGNAL FOLLOWER/ISOLATER ***XLNT***
BOMAC 12M03-104 REGULATOR BOARD ***NNB***
GOULD SHAWMUT A70P600 AMPTRAP FUSE 70A 600V ***XLNT***
PEER T3261061 OFFSET LINK 5/8" PITCH (BOX OF 15) ***NIB***
BANNER B8-1M1M1MC3 PHOTOELECTRIC AMPLIFIER 15VDC ***XLNT***
P&H 75040D12 230/460 IN 115 OUT 1.5KVA TRANSFORMER ***XLNT***
AUTOTRON E8AC-LITE SENSOR ***NIB***
KLOCKNER MOELLER Z00-0 MOTOR OVERLOAD RELAY ***NIB***
RELIANCE 0-57410/057410/O-57410/57C410 ANALOG OUTPUT MODULE 35A ***RFB***
SQUARE D 3020-CM150X1 CIRCUIT MONITOR ***NIB***
RELIANCE 0-57413-3E/0574133E/O-57413-3E/57C413B MEMORY MODULE ***XLNT***
CMC MO-02195 GATE FIRING BOARD ***XLNT***
REXROTH VT 2013 S15/2 PROP AMPLIFIER CIRCUIT CARD ***XLNT***
POWERTEC 141-106 CAPACITOR BOARD ***XLNT***
ALLEN BRADLEY 7300-UPK/634490A-90 ARITHMATIC LOGIC ***RFB***
TCP HMI40200A2P OPERATOR INTERFACE ***XLNT***
RELIANCE 0-51865-21/051865-21/05186521/O-51865-21 CURRENT LOOP DRIVER CLDY *NIB*
DODGE 140-D-M-2-A-I-6.2-A1/M85720XGB GEAR REDUCER ***NNB***
SICK ELECTRONIC WSU26-131 PHOTOELECTRIC SENSOR ***NIB***
ALLEN BRADLEY 7300-VDZ/634977-90-3 RESOLVER FEEDBAC ***RFB***
TEXAS INSTRUMENTS 5TI-1013 SEQUENCER MODULE ***XLNT***
GBT ELECTRONICS 21.07.AOO.44 TRANSFORMER 3PH 1.6KVA ***XLNT***
TEXAS INSTRUMENTS 5TI-1034-2 SEQUENCER MODULE ***XLNT***
OPTO 22 PB4H RELAY MOUNTING BOARD ***XLNT***
MITSUBISHI QM400HA-H TRANSISTOR BLOCK ***NNB***
TEXAS INSTRUMENTS 305-PRG PROGRAMMER MODULE ***XLNT***
PAYNE 18E-2-20 POWER CONTROL 3PH SOLID STATE ***XLNT***
TEXAS INSTRUMENTS 5TI-5500 EXPANDER MODULE 120V ***XLNT***
PROFACE/PRO-FACE GP43J-EG11 GRAPHIC PANEL ***XLNT***
NORTHERN TECHNOLOGIES HMI-CAB-C83 CABLE ***XLNT***
ABB S283 K10A CIRCUIT BREAKER 10A (LOT OF 2) ***XLNT***
SQUARE D 2546F TRANSFORMER SINGLE PHASE ***XLNT***
FISCHER-BACKUS 90-00518-01 PATCH CABLE ***XLNT***
NORGREN F73G-2AN-QD3 LUBRICATOR 250PSIG ***XLNT***
ALLEN BRADLEY S201525 DIODE BRIDGE 7.5HP ***NIB***
NORGREN L73M-2AP-QDN LUBRICATOR 250 PSIG ***XLNT***
SIMPSON 16157 GAUGE 0-100A ***NIB***
SIEMENS/TI 500-5007 INPUT MODULE 3.5-15VDC ***NNB***
PARKER RGDHLTS251 GLAND DRAIN ***NIB***
RELIANCE 61C542A/61C-542-A/O-57459-1/0-57459-1 16CH ANALOG INPUT MODULE **NNB**
OPTO 22 AC7 CONVERTER MODULE ****NNB***
SIEMENS 6ES5-421-8MA12/6ES54-21-8MA12/6ES5421-8MA12/6ES54218MA12 INTERFACE*XLNT*
MELCHER LM1501-7R/M1000 AC-DC/DC-DC CONVERTER ***XLNT***
RELIANCE 802269-58R TRANSFORMER ***NNB***
COOPER/CROUSE-HINDS LB65 CONDUIT BODY 2" ***NIB***
CUTLER HAMMER OPTA2/OPTA-2 I/O CARD ***XLNT***
PARKER SC 1" CONDUIT BEAM CLAMP (LOT OF 2) ***NNB***
UNDERWRITERS LABORITORIES E-93148 STEEL CONDUIT ***NNB***
NEER 4" SCREW COUPLING TC-520 (LOT OF 2) ALUMINUM ***NEW***
3-1/2" SCREW COUPLING TC-519 (LOT OF 10) ALUMINUM ***NEW***
HALEX 134-8 SCREW COUPLING 3" (LOT OF 9) ***NNB***
2-1/2" SCREW COUPLING TK-227-SC (LOT OF 31) ***NEW***
GIDDINGS & LEWIS 502-03840-02R1 SERVO ENCODER ***XLNT***
WATEC UP3R30P 4330-01-350-9102 FLUID FILTER ELEMENT (BAG OF 10) ***NIB***
AMFLO 430083 BLOWGUN AIR CONTROL NOZZLE ***NIB***
BANNER RSBLVAG MAXI-BEAM PHOTOELECTRIC SCANNER ***XLNT***
GE CR224C310F OVERLOAD RELAY 600VAC ***XLNT***
PROGRESS LIGHTING P6691-83 RECESSED LIGHTING FIXTURE ***NIB***
RELIANCE 64670-30D TRANSFORMER ***XLNT***
PARKER 71-016945-03 CABLE ASSEMBLY GEMINI DRIVE ***XLNT***
STEARNS 108706600EWF-REV B BRAKE ASSEMBLY ***NIB***
MODICON/EMECANIQUE 170NEF11021/170 NEF 110 21/170 ADM 350 10 TSX MOMENTUM*RFB
RELIANCE 0-54350-3/0543503/O-54350-3 FIELD LOSS PC BOARD ***XLNT***
KAUFEL/LACONIA 82-823/LMI-2172 TRANSFORMER ***XLNT***
SPANG LC7G5-A-26000 POWER CONTROL UNIT 50KVA ***NNB***
GE 9T51B0029 TRANSFORMER 0.750KVA ***XLNT***
CMC/CLEVELAND MO-02194/D41-9129 CONTROL BOARD ***XLNT***
P&H 75Z61-D1 TRANSFORMER 0.25KVA 50/60HZ ***XLNT***
P&H 75Z542D1 TRANSFORMER 0.300KVA 50/60HZ 1PH ***XLNT***
AMICON Ry21 REGULATOR BOARD/CARD ***XLNT***
ABB MDD25-12N1 CONTACT BLOCK ***XLNT***