描述

（2）PLC控制系統(tǒng)的輸出電路設(shè)計(jì)。依據(jù)生產(chǎn)工藝要求，各種指示燈、變頻器/數(shù)字直流調(diào)速器的啟動(dòng)停止應(yīng)采用晶體管輸出，它適應(yīng)于高頻動(dòng)作，并且響應(yīng)時(shí)間短;如果PLC系統(tǒng)輸出頻率為每分鐘6次以下，應(yīng)首選繼電器輸出，采用這種方法，輸出電路的設(shè)計(jì)簡(jiǎn)單，抗干擾和帶負(fù)載能力強(qiáng)。

如果PLC輸出帶電磁線圈等感性負(fù)載，負(fù)載斷電時(shí)會(huì)對(duì)PLC的輸出造成浪涌電流的沖擊，為此，對(duì)直流感性負(fù)載應(yīng)在其旁邊并接續(xù)流二極管，對(duì)交流感性負(fù)載應(yīng)并接浪涌吸收電路，可有效保護(hù)PLC。

當(dāng)PLC掃描頻率為10次／min以下時(shí)，既可以采用繼電器輸出方式，也可以采用PLC輸出驅(qū)動(dòng)中間繼電器或者固態(tài)繼電器（SSR），再驅(qū)動(dòng)負(fù)載。

對(duì)于兩個(gè)重要輸出量，不僅在PLC內(nèi)部互鎖，建議在PLC外部也進(jìn)行硬件上的互鎖，以加強(qiáng)PLC系統(tǒng)運(yùn)行的安全性、可靠性。

對(duì)于常見(jiàn)的AC220V交流開(kāi)關(guān)類負(fù)載，例如交流接觸器、電磁閥等，應(yīng)該通過(guò)DC24V微小型中間繼電器驅(qū)動(dòng)，避免PLC的DO接點(diǎn)直接驅(qū)動(dòng)，盡管PLC手冊(cè)標(biāo)稱具有AC220V交流開(kāi)關(guān)類負(fù)載驅(qū)動(dòng)能力。

（3）PLC控制系統(tǒng)的抗干擾設(shè)計(jì)。隨著工業(yè)自動(dòng)化技術(shù)的日新月異的發(fā)展，晶閘管可控整流和變頻調(diào)速裝置使用日益廣泛，這帶來(lái)了交流電網(wǎng)的污染，也給控制系統(tǒng)帶來(lái)了許多干擾問(wèn)題，防干擾是PLC控制系統(tǒng)設(shè)計(jì)時(shí)必須考慮的問(wèn)題。一般采用以下幾種方式:

隔離:由于電網(wǎng)中的高頻干擾主要是原副邊繞組之間的分布電容耦合而成，所以建議采用1:1超隔離變壓器，并將中性點(diǎn)經(jīng)電容接地。

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，福克斯波羅、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(lè)，ACSO，力士樂(lè)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

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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