国产精品久久久久久久久,四季AV一区二区夜夜嗨,日韩精品无码中文字幕电影,www.五月婷婷.com

1761-L16AWA現(xiàn)貨 in stock! 歡迎來電咨詢~！！

作為火電廠安全經濟運行主導因素的熱控自動化設備DCS系統(tǒng)，近年來得到了普遍應用，為火電廠機組安全、穩(wěn)定的運行起到了積極的作用。但是，DCS系統(tǒng)的安全性和可靠性還有待提高，在運行過程中經常會出現(xiàn)這樣或那樣的故障，這些故障的出現(xiàn)，導致了發(fā)電機組的非計劃停運，給發(fā)電企業(yè)造成不應有的損失。
　　1、DCS系統(tǒng)常見的故障
　　隨著工業(yè)生產自動化的不斷興起、過程控制要求的日益復雜，一種綜合控制系統(tǒng)――DCS系統(tǒng)應用而生了。由于目前各火電廠對DCS系統(tǒng)的應用水平的限制，系統(tǒng)在運行過程中難免會出現(xiàn)故障。常見的DCS系統(tǒng)故障有：電源系統(tǒng)故障、硬件(模件)故障、系統(tǒng)軟件故障和通信網絡系統(tǒng)故障。
　　1.1電源系統(tǒng)故障
　　電源故障是DCS系統(tǒng)的致命故障，一旦電源出現(xiàn)故障，不僅整個系統(tǒng)會停止運行，而且還會導致機組的跳閘，造成非計劃停運。
　　1.1.1電源系統(tǒng)出現(xiàn)故障的主要原因
　　電源方面的問題比較多，一是備用電源不能自投，雖采用UPS和APS雙路互為備用的供電方式，但在轉換時也會出現(xiàn)瞬間失電，導致機組跳閘;二是保險配置不合理及DPU電源內部故障等造成電源中斷，導致系統(tǒng)運行的停止;三是穩(wěn)壓電源波動引起保護誤動及接插頭接觸不良導致穩(wěn)壓電源無輸出;四是有的系統(tǒng)整個機柜通過一路保險供所有輸入信號或一路電源外接負載很大，導致模件的損壞;五是系統(tǒng)電源未采用UPS供電，冗余備用就更無從談起。
　　1.1.2電源系統(tǒng)故障應采取的防范措施
　　要保證DCS系統(tǒng)的安全、穩(wěn)定，首先要具備合理的電源布置，其次要選用高質量的電源模塊，并要保證較高的冗余率。再次是注意觀察電源的輸出電壓，防止出現(xiàn)波動。第四是對電源實行壽命管理，該更換的時候必須更換，絕對不允許等到電源出現(xiàn)了故障的時候才更換。
　　1.2硬件(模件)故障
　　DCS系統(tǒng)的硬件(模件)卡件可分為處理器模件、I/O模件及通訊模件三大部分，這三大模件的功能各自不同，常見的故障部位為過程通道和人機接口。
　　1.2.1硬件(模件)出現(xiàn)故障的主要原因
　�、龠^程通道故障也就是I/O卡件故障。引起I/O卡件發(fā)生故障的第一方面的原因是卡件因長時間工作而出現(xiàn)老化和損壞，這種工作的發(fā)生，一般是隱藏性的，只有參數出現(xiàn)異常，系統(tǒng)才會報警;第二個方面是連接線松動導致部分I/O模件與主機的通信中斷，在這種情況下，系統(tǒng)會馬上做出反應，出現(xiàn)報警;第三個方面是外界強電信號竄入形成干擾而導致通道故障的發(fā)生。
　�、谥T如球標和控制操作出現(xiàn)失靈和實效以及操作員站出現(xiàn)死機、鍵盤和打印機出現(xiàn)工作不正常的現(xiàn)象都屬于人機接口故障。
　　球標操作失靈的原因有裝置因長時間工作發(fā)生老化或者被浮塵或油膩污染，致使觸點不能實現(xiàn)自行通斷，也或是電纜插頭接觸不良造成與主機的通信斷路。
　　控制操作實效的主要原因是因球標的操作信號不能改變過程通道的狀態(tài)，有三種可能：其一可能是過程通道硬件發(fā)生故障;其二可能是操作員站所用軟件的缺陷;其三是設備超負荷或者過多地打開窗口，導致不響應。
　　操作員站死機的原因基本與控制操作失效的原因相同。
　　鍵盤工作不正常的原因有：鍵盤組態(tài)出現(xiàn)錯誤、接觸不良、連接電纜松動或者在啟動主機時誤動了鍵盤，造成啟動缺失。
　　打印機出現(xiàn)工作不正常的原因：或者是配置不合理，或者是因對打印機實施屏蔽而造成的。

ABB IEPAS02 SEAL DATE 11-29-10 POWER SUPPLY SEALED

Acterna JDSU EDT-135 E1 and Data Circuit Tester BN4562/34 EDT135 EDT 135

(3)GOULD BREAKER TYPE K-600S FRAME SIZE 600A /SOLID STATE TRIP ITE TYPE SS

70pcs/ Mitsubishi APD for Long Haul and OTDR FU-318SAP-V2M3

MULTILIN T60-G03-ACH-F8H-H6M-MXX-PXX-UXX-WXX NSFP T60G03ACHF8HH6MM

ALLEN BRADLEY 1336E-BX040-AN-EN-L9E USPP 1336EBX040ANENL9

BANNER ENGINEERING USDKTE4824C5YP2 NSFP USDKTE4824C5YP2

DYNAMATIC AF-502203-0480 USPP AF5022030480

INDRAMAT DDS03.1W/030-DS01-02FW USPP DDS031W030DS0102

YASKAWA ELECTRIC CACR-PR10BC3CSY10 NSPP CACRPR10BC3CSY10

WARNER ELECTRIC 5284-271-005 USPP 5284271005

HONEYWELL 4DP7APXIO11 USPP 4DP7APXIO11

Siemens 6ES5-243-1AA12 USPP 6ES52431AA12

SIEMENS 6ES5 376-0AA31 6ES53760AA31

SIEMENS DRIVE 6ES5-902-3SA12

Siemens 807 1070 001 8071070001 BL 2 6ES5 900-0AA12 SPCB145 BOARD

SIEMENS 6ES5-925-3KA12 6ES59253KA12

Siemens MP277-8 6AV6 643-0CB01-1AX1 Touchscreen Glass

RELIANCE ELECTRIC 0-51862-1 PLC USAB MODULE NIB

Texas Instruments 500-5864A

SQUARE D SYMAX 8030-CRM-510 INTERFACE MODULE SY/NET SERIES H2 REV. 5.00 1AMP

Unico 306-563 306563 I/O Parallel Interface Module

Siemens Connector 6ES7 392-1AJ00-0AA0 NIB

Modicon AS-W907-025

Schneider Modicon Romy as Sissi and Karlheinz Bohm as Franz Joseph of Austria

Schneider Modicon AEG/GOULD/MODICON/ AS-B565-000 INPUT MODULE 24VAC XLNT

Schneider Modicon AS-BDAU-208 NSFP ASBDAU208

Schneider Modicon AS-BDAP-210 ASBDAP210

Schneider Modicon /Schneider DEP216/AS-BDEP-216 Discrete Input

Schneider Modicon Control Module AS-B827-032 11091

Schneider MODICON TXBTF024411E TXB TF024411E

Schneider TSX 140DD135300 Input Module 24V 4X8 NIB

Radisys AMC7211-CFG02 Single MidSize Quad GE Ethernet

SIEMENS 6ES5-456-4UB11/6ES5456-4UB11 OUTPUT MODULE NIB

SIEMENS SINUMERIK OP012 6FC5203-0AF02-0AAL MembraKeypad

Mitsubishi Communication Module Serial AJ71C24S3

SIEMENS SIMODRIVE 6SN1118-0DH23-0AA1 6SN1-118-0DH23-0AA1

SIEMENS Sinumerik DMP Module Modul 6FC5111-0CA01-0AA0

SIEMENS 6FC3984-3TB I/O module

ALLENBRADLEY1201HA2PROGRAMMINGTERMINALSD3

Allen Bradley SLC 500 1746-OX8 -0X8 Output Module Sealed Box NIFSB

ABB Robot Wrist 3HAB4325-1 Refurbished by ABB

A06B-0143-B177#7075 FANUC SERVO MOTORS REMANUFACTURED

0-10GOhm 0.1% Decade resistance resistor P40103 an-g GR L&N ESI IET GR

MOTOMAN ROBOTICS RM6210 USPP RM6210

ALLEN BRADLEY 1746-BLM FNFP 1746BLM

ALLEN BRADLEY 1336-B005-EAD USPP 1336B005EAD

GENERAL ELECTRIC 36D877201EAG01 USPP 36D877201EAG01

SQUARE D MHL36600-42MV-1052 USPP MHL3660042MV1052

SIEMENS 6SE3122-4DG40 NSPP 6SE31224DG40

ASEA BROWN BOVERI QK-140-2R6500 USPP QK1402R6500

Siemens 6ES5 944-7UA21 6ES59447UA21

Siemens Simatic S5 6ES5 470-4UC12 6ES54704UC12 Analog

SIEMENS 6ES5-700-8MA21 NSFP 6ES57008MA21

Siemens 6ES5 470-4UC12/6ES54704UC12 Analog Output

Siemens 6AG1312-5BE03-2AB0 CPU312C

Siemens IM153-1 6ES7153-1AA02-0XB0 6ES7 153-1AA02-0XB0

Sans Digital HA-ARC-ARC1882X 2 Port Mini-SAS 6GB PCI Express x8 RAID Controller

Square D TBX CBS010

SIEMENS Interface Module 6ES5300-5CA11

SERIES C F/W B PKG 01/25/2012 QTY

Siemens 6SE7023-4TC84-1HF3

Siemens USB PPI+ PLC Cable PC PPI USB Optical Isolated

Schneider Modicon AS-P840-000 ASP840000 Power Supply

Schneider Modicon ASB882239 PERFECT CONDITION High Speed Counter Module AS-B882-239

Schneider Modicon AS-B838-032 USPP ASB838032

Schneider Modicon SEALED AS-BDEP-210

Schneider Modicon B827 24VDC INPUT MODULE AS-B827-032 NO TERMINAL

Schneider Modicon AS-H827-103 11 SLOT RACK

SCHNEIDER MODICON TELEMECANIQUE TC2000 INDUSTRIAL PC OPERATOR INTERFACE 3515 KPM

SIEMENS 6ES5-421-8MA12 6ES54218MA12 INPUT MODULE 4 NOS WITH BASE

Robotron 503-1-0324-16 5031032416 I/O Module Rev E1

Siemens Contactor 3RT1033-3AK60 110V 50Hz 120V 60Hz

SIEMENS Sinumerik 9 Slot Rack 6FM2805-1WL00 WARRANTY

RELIANCE ELECTRIC COMMUNICATIONS MEMORY MODULE 57413 57-413 0-57413-E

SIEMENS CONTROLLER CARD 6SN1118-0DG21-0AA1

SIEMENS Simodrive 6SN1118-0DG23-0AA0 6SN11180DG230AA0

SIEMENS 6FC5110-0CB01-0AA0 6FC51100CB010AA0 version F

AllenBradley2711P-RP2A/F2711PRP2F

ALLEN BRADLEY VERSAVIEW 1500M OPERATOR INTERFACE TOUCH PANEL 6186-M15AL SER B

ABB GJR5251500R1161 07KP92B, , GJR5251500R1161,

Advanced Energy E'Wave DC Power Supply Generator

(M6-2) 1 MEDAR 49209 TIMER M6-2

MARPOSS 882I330930 NSPP 882I330930

ALLEN BRADLEY 1336-B025-EDF-FA2-L3 USPP 1336B025EDFFA2L3

GE FANUC IC3606SPCC1D USPP IC3606SPCC1D

FANUC A06B-6079-H208 USPP A06B6079H208

SIEMENS 6AV1-242-0AB00 USPP 6AV12420AB00

RELIANCE ELECTRIC 0-864660-74R USPP 086466074R

SIEMENS 6ES5-451-3AA11 USPP 6ES54513AA11

Siemens 6ES5 470-4UA12 6ES54704UA12

Siemens 6ES5-944-7UB21 NICE

SIEMENS 6ES5-436-4UA12/6ES5436-4UA12 INPUT MODULE NIB

Siemens 6ES5 710-0AA11 Sub Racks

Siemens S5 6ES5 941-7UA13 37352

SIEMENS C85139-E1721-A880

Siemens 6ES5100-8MA02 6ES5 100-8MA02 SIMATIC S5-100U CPU100 Controller

Square D 8020 SCP-423

OFFER WIN- Allen-Bradley 1492-IFM20D120 Ser.A Rev.A Interface Module

WS-C3560V2-24TS-SD FREE 1 YEAR CISCO 3560V2 SWITCH

Siemens 6ES7291-8GE20-0XA0 Memory Module

Siemens SIMATIC S7-400 6ES7 412-2XG00-0AB0 CPU 412-2

Reliance 803612-SE

Schneider Modicon ASW808002 Excellent Cable Assembly AS-W808-002

Schneider Modicon AS-B422-000 USPP ASB422000

Schneider Modicon AS-W191-015 NSFP ASW191015

Schneider Modicon AS-BDAP-218 ASBDAP218

Schneider Modicon AS-B824-016 24VDC Output Module EXCELLENT

MODICON AS-B262-001 ANALOG OUTPUT MODULE RECONDITIONED

SIEMENS INPUT MODULE 505-4316A NICE

Shuttle X50V3 15.6" Atom D2700 GMA3650 DDR3-1600 Gigabit All-In-One System

SIEMENS OPERATOR INTERFACE TOUCH PANEL SIMATIC TP27 6AV3 627 6AV3627-1QL01-0AX0

SIEMENS SINUMERIK 3/800 6FC3988-7AH20 TESTED WARRANTY

TELEMECANIQUE TBXLEP030 COMMUNICATION MODULE TBX7 FIP

SIEMENS 6SN1118-0DM23-0AA0 CONTROL MODULE W/FBACK QTY

SIEMENS Simo Simodrive Drive 3-531-4647A QTY

SIEMENS 6FC5-356-0BB11-0AE1 USPP 6FC53560BB110AE1

Advantech PCM-7310 Single Board Computer

Allen-Bradley 1746-OB16E SLC500 Electronically Protected DC Output Module

ABB BAILEY SYMPHONY CONTROLS DIGITAL IMASI23 ANALOG INPUT SLAVE MODULE 88110

ADEPT TECH 10330-10200 USPP 1033010200

(000 BACK) 1 NIB CHROMALOX 4632-40430 TEMPERATURE CONTROL PANEL (BACK)

INA PR14182 NSFP PR14182

TELEDYNE M300E NSFP M300E

DYNAMATIC 15-867-13 NSFP 1586713

CUTLER HAMMER 7585T-8-OPC USPP 7585T8OPC

PERCEPTRON 911-0052 USPP 9110052

MODICON AS-516P-008 USPP AS516P008

HONEYWELL 30734558-501 NSFP 30734558501

Siemens 6ES5 308-3UC21 6ES53083UC21

Siemens 6ES5-526-3LA11 USPP 6ES55263LA11

SIEMENS 6ES5-373-0AA61 NSFP 6ES53730AA61

Siemens 6ES5 262-8MA12 Controller W/ 6ES5 700-8MA11

Siemens 6ES54357LA11 6ES5 435-7LA11 J9-HO VER01

SIEMENS 6GK7-343-1CX00-0XE0 6GK73431CX000XE0

Siemens TP27 6AV3 627-1QL00-0AX0

Siemens 6ES5924-3SA11

Lauterbach LA-7708 Trace32 JTAG In-Circuit Power Debugger Interface Module

YASKAWA CIMR-PCU40P7 MINI DRIVE 1HP 3PH 0-460V 0-400HZ.

SIEMENS 6ES7 223-1BH21-0XA0 6ES7223-1BH21-0XA0 FreeShip

Siemens OP37 6AV3 637-7AB16-1AM0 Membrane Keypad

Reliance 0-48652

Schneider Modicon AS-B807-032 120VAC Input ASB807032

Schneider Modicon AS-884A-201 PROCESSOR MODULE AS884A201

Schneider Modicon AS-P180-010 USPP ASP180010

Schneider Modicon AS-B243

Schneider Modicon AS-5540-003 Bus Duct

Modicon TSX Quantum 24-230 VAC Output Module 140DAO84000

SIEMENS SIMATIC S7 SM321 DIGITAL INPUT MODULE PLC 6ES7 321 6ES7321-1BH02-0AA0

TELEMECANIQUE XBTGT2110 Touchscreen Glass

Siemens Simatic Relay Output Module 505-4916A 16 pts

Siemens 9510 9510DC-1156-GZZA NIB Power Meter Display ION Ethernet Access

SIEMENS SINUMERIK I/O MODULE 6FC5611-0CA01-0AA0

SIEMENS 6SN1123-1AA00-0EA0 6SN1 123-1AA00-0EA0 SIMODRIVE 611 160A Ver D

SIEMENS SIMODRIVE 6SN1123-1AA00-0LA1

SIEMENS HMI 6FC5253-6BX10-2AFC PCU 50 566mHZ6FC5210- 00F20-0AA0840D BS003

Advantech PCM-7130 Rev.A1 NIB

ALLEN-BRADLEY 2711-K5A20 PANELVIEW 550 2711K5A20 CLEAN TESTED GOOD COND.

ABB 6008BZ10000C VIDEO MODULE PCB

Acterna ANT-20

6962ED2580A2 Starter CUTLER HAMMER

8520CPUX ALLEN BRADLEY ELECTRONIC CIRCUIT BOARD REMANUFACTURED

SIEMENS 6SE3-221-3DC40 USPP 6SE32213DC40

AVTRON AFS110-4CN0-C USPP AFS1104CN0C

ASEA BROWN BOVERI MSB63800L NSFP MSB63800L

MODICON 140-CPU-534-14 USPP 140CPU53414

INDRAMAT MDD071C-N-030-N2S-095PB0 NSFP MDD071CN030N2S01

ASEA BROWN BOVERI ACH401601632+A0BE0000 USPP ACH401601632A0BE

TITAN CORPORATION MMI-150 USPP MMI150

Siemens 6ES5-441-7LA13/6ES5441-7LA13 OUTPUT MODULE NIB

SIEMENS 6ES5 521-8MA21 6ES5521-8MA21

SIEMENS S5 6ES5 310-3AB13 6ES53013AB13

Siemens S5 6ES5 544-3UA11 6ES5544 6ES55443UA11

Siemens 6ES7 953-8LG20-0AA0 6ES79538LG200AA0 128K MMC in Box ping

Siemens S5 PLC Lithium Battery 6ES5 980-0AA21 NIB

PMA DC 150-CAN inbligent DDC control PLC 16 digital I/O 9407 700 50341

HONEYWELL EXPERIAN TC-CCR013 DUAL REDUNDANT NET INTERFACE MODULE

Wago 750-631 Interface Module 750631

Siemens 6DS1325-8AA 6DS13258AA in Box, Seal opened,

Siemens LOGO! 230RC 6ED1052-1FB00-0BA6 in box

Omron 3G2A5-PS221E

Schneider Modicon AS-M84A-102 ASM84A102 CPU Processor NIB

Schneider Modicon MEMORY BOARD AS-506P-F12 REV C21 /REPAIRED

Schneider Modicon AS-H819-107 NSPP ASH819107

Schneider Modicon GOULD/ MODULE - AS-B814-001

Schneider Modicon AS-BDEO-216 INPUT MODULE ASBDEO216

Schneider Modicon REMOTE I/O ADAPTOR POWER SUPPLY AS-P890-0005201

Telemecanique Inverter Operator Panel ATV71

Schneider Telemecanique Overload Relay LRD16KN

SIEMENS/TI/CTI 505-2599/2599 32PT AC OUTPUT MODULE XLNT

Siemens 6AV6 542-0CA10-0AX0 6AV65420CA100AX0 Panel

SIEMENS Sinumerik 6FC5147-0AA07-0AA0. Cooling Fan 840C

GE FANUC COMMUNICATION CONTROL MDL MODULE IC693CMM311E

SIEMENS WARRANTY SIMODRIVE 611 Digital Control

SIEMENS SINUMERIC 840D 6FC5247-0AA00-0AA2

SIEMENS ACROMAG/SIEMENS/MOORE 15669-36-5/15669-1-14 PROM BOARD XLNT

Allen-Bradley CAT. No 1771-OBD/B 10-60 VDC Output Module

A-B QUALITY PLC-5/V30B,PLC CPU BOARD

AC Motor Speed Control VFD - 25 HP - 480 Volt - Three Phase Input

A06B-0752-B131#3000 Motor Fanuc

750kVA Pad Mount Transber with 200A 15KV Loop Feed Bushings

RELIANCE ELECTRIC SA3000DC17.5 USPP SA3000DC175

ALLEN BRADLEY 5370-CVIM2 USPP 5370CVIM2

ALLEN BRADLEY 20DD8P0A0EYNANNNN USPP 20DD8P0A0EYNANNN

INDRAMAT MAC-112B-2-GD-3-C/130-B-0/S001 USPP MAC112B2GD3C130B

YASKAWA ELECTRIC DDSCR-GL60H3 NSFP DDSCRGL60H3

WESTINGHOUSE 716B034A29 USPP 716B034A29

INDUSTRIAL DEVICES SMARTSTEP-240 USPP SMARTSTEP240

Siemens 6ES5-246-4UB11 NSFP 6ES52464UB11

SIEMENS 6ES5 377-0AA32 6ES53770AA32

SIEMENS Memory Submodule 6ES5376-1AA21 SURPLUS NIB W/PAPERWORK

Siemens BOARD 6ES5-410-0AA12 6ES5 410 0AA12 6ES54100AA12 E8843-0-A3653-C4-B

Siemens 6ES7 151-1AA02-0AB0 6ES7151-1AA02-0AB0 FreeShip

Siemens OP Program Cable 6XV 440-2KH32 6XV4402KH32

Reliance 57401 57401-1B Digital I/O Module NIB

Texas Instruments 505-4816

Sunpak Flash OT-1D TTL Interface Module Olympus NICE UN

UBR7200-NPE-G1 CISCO UBR NPEG1 ENGINE W/ 512MB D/64MB F 3 GE/FE/E

Siemens CP243-1 6GK7 243-1EX01-0XE0 6GK72431EX010XE0

Modicon DI-1131-000

Schneider Modicon /Schneider DTA-201 AS-HDTA-201 Secondary Subrack

Schneider Modicon ASB238 ASB238001 Output Module AS-B238-001

Schneider Modicon AS-BDEP-211 NSFP ASBDEP211

Schneider Modicon AS-BDAP-218 Discreet Output Relay ASBDAP218