描述
4、PLC外部驅(qū)動(dòng)電路對(duì)于PLC輸出不能直接帶動(dòng)負(fù)載的情況下,必須在外部采用驅(qū)動(dòng)電路:可以用三極管驅(qū),也可以用固態(tài)繼電器或晶閘管電路驅(qū)動(dòng),同時(shí)應(yīng)采用保護(hù)電路和浪涌吸收電路,且每路有顯示二極管(LED)指示。印制板應(yīng)做成插拔式,易于維修。
PLC的輸入輸出布線也有一定的要求,請(qǐng)看各公司的使用說明書。
三、擴(kuò)展模塊的選用
對(duì)于小的系統(tǒng),如80點(diǎn)以內(nèi)的系統(tǒng).一般不需要擴(kuò)展;當(dāng)系統(tǒng)較大時(shí),就要擴(kuò)展。不同公司的產(chǎn)品,對(duì)系統(tǒng)總點(diǎn)數(shù)及擴(kuò)展模塊的數(shù)量都有限制,當(dāng)擴(kuò)展仍不能滿足要求時(shí),可采用網(wǎng)絡(luò)結(jié)構(gòu);同時(shí),有些廠家產(chǎn)品的個(gè)別指令不支持?jǐn)U展模塊,因此,在進(jìn)行軟件編制時(shí)要注意。當(dāng)采用溫度等模擬模塊時(shí),各廠家也有一些規(guī)定,請(qǐng)看相關(guān)的技術(shù)手冊(cè)。
各公司的擴(kuò)展模塊種類很多,如單輸入模塊、單輸出模塊、輸入輸出模塊、溫度模塊、高速輸入模塊等。PLC的這種模塊化設(shè)計(jì)為用戶的產(chǎn)品開發(fā)提供了方便。
四、PLC的網(wǎng)絡(luò)設(shè)計(jì)
當(dāng)用PLC進(jìn)行網(wǎng)絡(luò)設(shè)計(jì)時(shí),其難度比PLC單機(jī)控制大得多。首先你應(yīng)選用自己較熟悉的機(jī)型,對(duì)其基本指令和功能指令有較深入的了解,并且指令的執(zhí)行速度和用戶程序存儲(chǔ)容量也應(yīng)仔細(xì)了解。否則,不能適應(yīng)你的實(shí)時(shí)要求,造成系統(tǒng)崩潰。另外,對(duì)通信接口、通信協(xié)議、數(shù)據(jù)傳送速度等也要考慮。
最后,還要向PLC的商家尋求網(wǎng)絡(luò)設(shè)計(jì)和軟件技術(shù)支持及詳細(xì)的技術(shù)資料,至于選用幾層工作站,依你的系統(tǒng)大小而定。
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(jì)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(dòng)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。
ADVANCED ENERGY PDW 2200 AE 3156011 Lam 853-015516-002
796-00809 ANGLE VALVE REBUILD KIT
LAM PART # 770-008341-002 PNEUMATIC CYLINDER
LAM 6 SPIN CHUCK PART # 715-013718-006
LAM RESEARCH ESC ELECTRODE 8 839-440462-308
AMAT PORT SERVER CABLE PART # 0140-77615
NOVELLUS THERMOCOUPLE UNIT PART # 03-10411-00
USHIO 100W Merqury Short Lamp
LAM RESEARCH RING COUPLER PART # 715-140153-008
PEDESTAL VACUUM PRESSURE SWITCH PART # 0090-77032
LAM ESC POWER SUPPLY DISTR. PCB PART # 810-370141-001
LAM GATE HEAD IONIZED PART # 715-012233-003
JUMPER 4PIN CONN, GEN RACK EMO AMAT PART# 0150-20143
CONN ADPTR MTG QDS-UL(F)/QC(M) AMAT PART # 0020-04376
LIFT PIN, .090, SIMPLE CATH AMAT PART # 0021-10566
TEFLON RING BLOCKER AMAT PART # 0021-38799
AMAT PART # 0020-21944 8 QTZ PRECLEAN PLATE
AMAT PART # 0020-24435 INSULATOR QUARTZ 8
AMAT PART # 0200-35224 VIEWPORT WINDOW
AMAT PART # 0200-35013
AMAT PART # 0200-09086
AMAT PART # 0200-35160
AMAT PART # 0200-35782 QUARTZ SHADOW RING 200mm FLAT
COMDEL CLX-2500 RF GENERATOR
COMDEL CLX2500 RF GENERATOR PART # FP1335R4
COMDEL CX1250S RF POWER SUPPLY
COMDEL CPS1001S 13.56mhz RF GENERATOR P/N 0190-70099
COMDEL CPS-500AS RF POWER SOURCE AMAT P/N 0190-13320
ADVANCED ENERGY PDX 500 RF GENERATOR
LAM RESEARCH BAFFLE PLATE LOWER PART # 715-011913-083
CENTURA SLIT VALVE DOOR PART # 0021-09922
THREE WAY VALVE AMAT PART # 3870-02221
PARKER THREE WAY VALVE MODEL # 955Y3NC
MKS ISOLATION VALVE MODEL # L2-40-AK-225-VN?VNH
AMAT PART # 0200-35556 COLLAR 200mm SNNF TOP
AMAT PART # 0200-20060 INSULATING QUARTZ 6 SMF PC11
AMAT PART # 0200-35539 200mm BLADE ROBOT QTZ w/RADIUS
AMAT PART # 0200-32985 GAS RING 12 HOLES
AMAT PART # 0200-35145 ADAPTER WINDOW 2mm RP CHAMBER
AMAT PART # 0200-10455
AMAT PART # 0200-76019 10N SHIELD LIFT
AMAT PART #0200-20074 DOOR PRECLEAN CHAMBER QUARTZ
EDWARDS QDP40 DRY VACUUM PUMP BRAND NEW ( NEVER USED )
AMAT PART #0020-29343 DARK SPACE SHIELD CLAMP
DPS II RF Source Matching Network (0190-15168)
Firmware has been updated
VEXTA STEPPING MOTOR MODEL PX243-01B
AMAT 8 SHUTTER DISK PART 3 0020-05384
AMAT ENDURA COVER RING PART # 0020-24804
LOWER MAGNETIC BRACKET AMAT PART # 0021-36605
CERAMIC LIFT PIN/SHORT PART # 0200-10162
BRACKET COIL FRONT PART #0021-36606
FRAME ALIGNMENT PIN PART # 0020-27812
VACUUM SWITCH PART # 853-017631-001
SLOW VACUUM VALVE MODEL # FPR-91-9.52
THERMCO PCB ASSEMBLY PART # 110568-005 Z-80 PROCESSOR
NOVELLUS NICKEL SPINDLE SHAFT
NOVELLUS ANALOG INPUT PCB SLOT 6 PART # 19-00126-00
AMAT PART 0020-19002
853-014637-012 MODEL OEM 6AM-1-B RF Generator
ADVANCED ENERGY RFG-1250 HALO
CATCHY .COM DOMAIN NAMES allfortools.com?+all4tools.com
2 NICE Nortel CARD CAGE CPCI CORE NET AC/DC NT4N40ACE5
AT&T DDM-2000 OC-3 OC3 SHELF/CHASIS LOADED WITH CARDS
QTY 28 NEW 3COM 1681-0 ISOLAN TP TRANSCEIVER 3C16810
60x 50/125 15′ FIBER OPTIC CABLES W/ODD CONNECT. SC-SC?
SQUARE D ATV58FHD28N4 ALTIVAR 58 AC DRIVE 25HP 18.5KV
13204′ NEW CORNING FIBER OPTIC FURCATION/FAN-O?UT TUBING
NEW SHENICK DIVERSIFEYE 8400 IP TESTER 8 SLOT CHASIS
BRUNSWICK MARINE P/A QUICKSILVER SEAWATER FILTER 860603
NEW ROFIN LASER SOFTSTART UNIT SLABLASER 1500-6000 WATT
NEW LOT OF 105 VARIOUS MARS MOTOR RUN CAPACITORS
AMAT APPLIED MATERIALS 0021-25014 DISK SHUTTER BESC PIN