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描述

140AVI03000

   在使用过程中,要保证正常运行所必须注意的一系列问题,最后给出合理的建议。
    PLC是专门为工业生产服务的控制装置,通常不需要采取什么措施,就可以直接在工业环境中使用。但是,当生产环境过于恶劣,电磁干扰特别强烈,或安装使用不当,都不能保证PLC的正常运行,因此在使用中应注意以下问题。
    PLC要求环境温度在0~55℃,安装时不能放在发热量大的元件下面,四周通风散热的空间应足
    够大,基本单元和扩展单元之间要有30mm以上间隔;开关柜上、下部应有通风的百叶窗,防止太阳光直接照射;如果周围环境超过55℃,要安装电风扇强迫通风。为了保证PLC的绝缘性能,空气的相对湿度应小于85%(无凝露)。
   应使PLC远离强烈的震动源,防止振动频率为10~55Hz的频繁或连续振动。当使用环境不可避
    免震动时,必须采取减震措施,如采用减震胶等。
    避免有腐蚀和易燃的气体,例如氯化氢、硫化氢等。对于空气中有较多粉尘或腐蚀性气体的环境,可将PLC安装在封闭性较好的控制室或控制柜中,并安装空气净化装置。
    PLC供电电源为50Hz、220(1±10%)V的交流电,对于电源线来的干扰,PLC本身具有足够的抵制能力。对于可靠性要求很高的场合或电源干扰特别严重的环境,可以安装一台带屏蔽层的变比为1:1的隔离变压器,以减少设备与地之间的干扰。还可以在电源输入端串接LC滤波电路。如图1所示。
    FX系列PLC有直流24V输出接线端,该接线端可为输入传感器(如光电开关或接近开关)提供直流24V电源。当输入端使用外接直流电源时,应选用直流稳压电源。因为普通的整流滤波电源,由于纹波的影响,容易使PLC接收到错误信息。
    动力线、控制线以及PLC的电源线和I/O线应分别配线,隔离变压器与PLC和I/O之间应采用双胶线连接。
    PLC应远离强干扰源如电焊机、大功率硅整流装置和大型动力设备,不能与高压电器安装在同一个开关柜内。
    PLC的输入与输出最好分开走线,开关量与模拟量也要分开敷设。模拟量信号的传送应采用屏蔽线,屏蔽层应一端或两端接地,接地电阻应小于屏蔽层电阻的1/10。
    PLC基本单元与扩展单元以及功能模块的连接线缆应单独敷设,以防止外界信号的干扰。
    交流输出线和直流输出线不要用同一根电缆,输出线应尽量远离高压线和动力线,避免并行。
    输入接线一般不要超过30米。但如果环境干扰较小,电压降不大时,输入接线可适当长些。
    输入/输出线不能用同一根电缆,输入/输出线要分开。
    尽可能采用常开触点形式连接到输入端,使编制的梯形图与继电器原理图一致,便于阅读。
    输出连接
    输出端接线分为独立输出和公共输出。在不同组中,可采用不同类型和电压等级的输出电压。但在同一组中的输出只能用同一类型、同一电压等级的电源。
    由于PLC的输出元件被封装在印制电路板上,并且连接至端子板,若将连接输出元件的负载短路,将烧毁印制电路板,因此,应用熔丝保护输出元件。
    采用继电器输出时,所承受的电感性负载的大小,会影响到继电器的使用寿命,因此,使用电感性负载时选择继电器工作寿命要长。
   PLC的输出负载可能产生干扰,因此要采取措施加以控制,如直流输出的续流管保护,交流输出的阻容吸收电路,晶体管及双向晶闸管输出的旁路电阻保护。
    为了确保整个系统能在安全状态下可靠工作,避免由于外部电源发生故障、PLC出现异常、误操作以及误输出造成的重大经济损失和人身伤亡事故,PLC外部应安装必要的保护电路。
   急停电路。对于能使用户造成伤害的危险负载,除了在控制程序中加以考虑之外,还应设计外部紧急停车电路,使得PLC发生故障时,能将引起伤害的负载电源可靠切断。
   保护电路。正反向运转等可逆操作的控制系统,要设置外部电器互锁保护;往复运行及升降移动的控制系统,要设置外部限位保护电路。
   可编程控制器有监视定时器等自检功能,检查出异常时,输出全部关闭。但当可编程控制器CPU故障时就不能控制输出,因此,对于能使用户造成伤害的危险负载,为确保设备在安全状态下运行,需设计外电路加以防护。
    电源过负荷的防护。如果PLC电源发生故障,中断时间少于10秒,PLC工作不受影响,若电源中断超过10秒或电源下降超过允许值,则PLC停止工作,所有的输出点均同时断开;当电源恢复时,若RUN输入接通,则操作自动进行。因此,对一些易过负载的输入设备应设置必要的限流保护电路。
    重大故障的报警及防护。对于易发生重大事故的场所,为了确保控制系统在重大事故发生时仍可靠的报警及防护,应将与重大故障有联系的信号通过外电路输出,以使控制系统在安全状况下运行。
    PLC的接地
    良好的接地是保证PLC可靠工作的重要条件,可以避免偶然发生的电压冲击危害。PLC的接地线与机器的接地端相接,接地线的截面积应不小于2mm2,接地电阻小于100Ω;如果要用扩展单元,其接地点应与基本单元的接地点接在一起。为了抑制加在电源及输入端、输出端的干扰,应给PLC接上专用地线,接地点应与动力设备(如电机)的接地点分开;若达不到这种要求,也必须做到与其它设备公共接地,禁止与其它设备串连接地。接地点应尽可能靠近PLC。
    冗余系统与热备用系统
    在石油、化工、冶金等行业的某些系统中,要求控制装置有极高的可靠性。如果控制系统发生故障,将会造成停产、原料大量浪费或设备损坏,给企业造成极大的经济损失。但是仅靠提高控制系统硬件的可靠性来满足上述要求是远远不够的,因为PLC本身可靠性的提高是有一定的限度。使用冗余系统或热备用系统就能够比较有效地解决上述问题。
    冗余控制系统
    在冗余控制系统中,整个PLC控制系统(或系统中最重要的部分,如CPU模块)由两套完全相同的系统组成如图2所示。两块CPU模块使用相同的用户程序并行工作,其中一块是主CPU,另一块是备用CPU;主CPU工作,而备用CPU的输出是被禁止的,当主CPU发生故障时,备用CPU自动投入运行。这一切换过程是由冗余处理单元RPU控制的,切换时间在1~3个扫描周期,I/O系统的切换也是由RPU完成的。
    热备用系统
    在热备用系统中,两台CPU用通讯接口连接在一起,均处于通电状态所示。当系统出现故障时,由主CPU通知备用CPU,使备用CPU投入运行。这一切换过程一般不太快,但它的结构有比冗余系统简单。

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NORTEL OPTERA METRO 3500 OPTA3500 NTN476AH NEW

CISCO N20-AQ0002= QLOGIC CONVERGED NETWORK ADAPTER

OVERLAND STORAGE DLT-LXLS8110RX DLT8000 AUTOLOADER LIBR

TURIN WHITE ROCK 1000BASE-SX X2 PLM WR-GBE02-S11-85​000

SYMBOL MC7094 HANDHELD COMPUTER BARCODE SCANNER

SYMBOL MC7094-PKCDJQHA​8WR HANDHELD SCANNER +EXTRAS

SYMBOL MC7094-PKCDJQHA​8WR HANDHELD BARCODE SCANNER +BAT

MOTOROLA 800MHZ FILTER 9164712A06 T431AB

OUTDOOR SECURITY CAMERA PRESSURIZED SYSTEM OPHIR +MORE!

ROSE ULTRAMATRIX 4XE EP4-1X16U 16-P KVM SWITCH NEW NIB!

HP R/T EXTENDED RUNTIME BATTERY MODULE 3KVA AF455A NEW!

DELL BATTERY BACKUP POWER SUPPLY UPS 3750W K804N

SONY VAIO VPC-EB1FGX/BI CORE I3 15.5″ 4GB 320GB W7 PRO!

HONEYWELL DOLPHIN 9550 9550L0P-231-C20 BARCODE TERMINAL

HP DW073-60040-ZB 200/400GB ULTRIUM LTO-2 460 Q1512C

NEC MULTISYNC 21.3″ LCD LCD2190UXP MONITOR 1000:1 NEW!

JUNIPER M160 STM-64/OC-192 SONET SMF-SR-2-B OC192 STM64

ADTRAN 1184560P2 TRANSCEIVER OC-48 2.67G SFP BRAND NEW!

SYMBOL PDA BARCODE SCANNER COMPUTER MC7090-PU0DCRFA​8WR

HP PROLIANT DL380 G5 SERVER +MB 2* PS 459585-005

BOSCH IP FLEXIDOME NETWORK POE CAMERA NWD-455V03-20P!​!!

SUNFIRE V480 RACK SERVER 4 * 1.2GHZ 32GB QUAD GIGABIT

DIALOGIC PBX INTEGRATION FAX+ BOARD VFX41JCTLSW 4PT PCI

HP COMPUTING COUNTER 5360A W/5365A INPUT MODULE +MANUAL

JUNIPER FPC-E ENHANCED FLEXIBLE PIC CONCENTRATOR

WATER TECH BLUE PEARL ROBOTIC SWIMMING POOL CLEANER NEW

APC SYMIM5 REMOTE POWER INTELLIGENCE MODULE SYMMETRY LX

SMC SMC8150L2 TIGERSWITCH 50 PORT 10/100/1000 SWITCH

NORTEL 44 PT GIGABIT LM-44GE SWITCH MOD SR0000018E5 NEW

CISCO GSR12000 THREE-PORT GE LINE CARD 3GE-GBIC-SC=

BLUEAIR 555EB HEPASILENT DIGITAL AIR PURIFIER 605 SQFT

TOTE VISION 10.4″ LCD HD MONITOR LCD-1048HD BRAND NEW!

SYMBOL HANDHELD BARCODE SCANNER MC9060-K KH0H9EEA7WW

SYMBOL MC7090 PDA RUGGED LASER BARCODE SCANNER

MS MICROSOFT PROJECT STANDARD 2010 NEW NIB FREE SHIP!!

NOVAR CONTROLS SAVVY 15 ENERGY INFOSYSTEM PANEL

ERICSSON ROJ 208 439/1 ROJ208439/1 PRINTED BOARD NEW!!

CISCO CATALYST WS-C2960-24TT-L 24 PORT SWITCH NEW NIB!

WATCHGUARD DV-1 OVERHEAD MOUNT MONITOR/RECORDE​R SYSTEM

CANOGA PERKINS 9145-5 NETWORK INTERFACE DEVICE NEW NIB!

H3C UNIFIED SECURITY PLATFORM SECPATH U200-CS FIREWALL

NETAPP DS14 MK2 SHELF CABINET 14*147GB 10K DS14MK2 ESH2

CISCO AIRONET AIR-AP1242AG-A-​K9 WIRELESS 1242AG NEW NIB

LENOVO IDEAPAD Y550 4186 CORE 2 DUO 2GHZ 4GB 320GB NEW

CISCO 1841 V05 INTEGRATED SERVICES ROUTER +WIC-1DSU-56K

HP PROLIANT DL380 G5 BAREBONES SERVER MB +PS 459585-005

DICKSON KT625 6″ KT6 MULTIPURPOSE / TEMP CHART RECORDER

MOTOROLA GENERAL DYNAMICS C4 BATTERY PACK RPN4000A

FORD F-250/350/450/5​50 04-09 CREW CAMO SEAT COVERS NEW

NETAPP BROCADE X1880-R6 LWL SFP 4GBPS 10KM R6 BRAND NEW

LENOVO IDEAPAD S12 2959 29595GU N270 1.6GHZ 3GB 320GB!!

8 * LUXOR LX-20S COLOR CCD DOME SECURITY CAMERA KIT NEW

JANDY AQUALINK RS 16 RS16 POWER CENTER CPU R0466811 NEW

THE OFFICIAL MICHAEL JACKSON OPUS BOOK LIMITED RARE NEW

CISCO INTEGRATED SERVICE ROUTER 881-SEC-K9 CISCO881 NEW

TOSHIBA SATELLITE PRO L450 15.6″ CORE 2 2.1GHZ 2GB NEW!

CISCO SYSTEMS NETWORK SERVICES ENGINE 7300-NSE-100

ALCATEL 1PB 101 INTL PROT 3AL07736DB 03 SNPQBP71AA

ETASIS EFRP-2463 2463G 460W SERVER POWER SUPPLY NEW!

FIBRE CHANNEL CONTROL UNIT L1U P/N: 69Y2732 NEW REFURB!

DELL QLOGIC DUAL PORT ADAPTER QME8142-DEL-SP 10GBPS HBA

F5 NETWORKS FIREPASS 1200 SECURITY APPLIANCE FP1200

CYBERPOWER SYSTEMS PR1500 6-OUTLET 1500VA/1000W UPS

CLIPSAL 4 CHANNEL DIMMER L5504D2A W 3* DLT RANGE SWITCH

PANASONIC PANADAC 361 CONTROL SYSTEM PANA ROBO P361L!!!

SUPERMICRO BAREBONES 2U RACKMOUNT SERVER 6025B-8/T

AVAYA 700432511 20 CHANNELS MP20 DSP DAUGHTERBOARD

HP PROLIANT QUAD CORE SYSTEM BOARD DL360 G5 435949-001

HYPERCOM OPTIMUM T4230 WIRELESS CREDIT CARD MACHINE

KOLLMORGEN SERVOSTAR CD SYNQNET DRIVE CR10551

APC POWER SMART UPS 750VA RACK TOWER MX750 SMX750 NEW

HP ELECTROINK 9 CANS +CALIB INDIGO PRESS 3000 4000 5000

POWERBRIGHT PW3500-12 3500W 7000W POWER INVERTER NEW!!!

ASUS EEE PC 1008P-KR-PU17-B​R 10.1″ NETBOOK N450 2GB NEW

HP/COMPAQ DELTA 1085W SWITCHING POWER SUPPLY DPS-1085AB

HP PROLIANT SERVER DL380 G4 2 * 3.2GHZ 6GB 2* 72GB 15K!

VORTEX EMERSON 130A 25V RECTIFIER 486531902 V130B25

BLACKBERRY STORM2 9550 UNLOCKED GSM ATT TMOBILE +16GB

NORTEL EXPANSION CABINET OPTION 11 NTAK11BDE5 NEW!!!

FALCO H.264 STAND ALONE 16CH DVR LX-16PRO 250GB DVDRW

QLOGIC PX2510401-22 PCI-X 4GB FC HOST BUS ADAPTER

EMC EMC2 STANDBY POWER SUPPLY 078-000-054 ASTEC AA23540

ASUS MOBILE ONE RM LAPTOP CORE 2 2.4GHZ 2GB 120GB DVDRW

F5 NETWORKS BIG IP GIGABIT SWITCH D51FN 5000 BIP04

SUN SUNFIRE V240 2*1.5GHZ ULTRASPARK IIIi 2GB 2*73GB!!!

GE SECURITY 1000 DUAL TECH PROXIMITY MAGSTRIPE READER

NORTEL GLOBAL 4*16 TRUNK MEDIA-BAY MODULE NT5B42AAAFE5

ALCATEL-LUCENT COMMON POWER CONF-B CPC-B KS24510L2A NEW

QUANTUM DLT-V4 BHBAM-EY 320GB INTERNAL SATA TAPE DRIVE

8 MOTOROLA WEARABLE RING SCANNERS + CHARGING STATION!

HP PROLIANT DL360 G4 378705-001 2*3.6GHZ 2GB 2*73GB 15K

LUCENT FLEXENT CDMA BASEBAND RADIO CBR 850 44WR28 4:4

EMERSON 1450W POWER SUPPLY HRS1450-9000B 1450 WATT

SYMBOL MC9062 RUGGED WIRELESS COMPUTER SCANNER TERMINAL

POWERTRONICS PQR D50 POWER MONITOR QUALITY RECORDER!!!

JUST CAVALLI ITTIERRE LONG DRESS BLACK SZ 40/6 NEW NWT

JUST CAVALLI ITTIERRE LONG DRESS LIME SIZE 40/6 NEW NWT

JUST CAVALLI ITTIERRE LONG DRESS LIME SIZE 42/8 NEW NWT

JUST CAVALLI ITTIERRE LONG DRESS LIME SIZE 38/4 NEW NWT

HUNTER PALOMAR 60″ AMBER BRONZE CEILING FAN 23765 NEW!!

ZYWAN CELLULAR ROUTING MODEM ZYWAN-GPRS1001 BRAND NEW

DOLCE & GABBANA WHITE JACKET WOMENS SZ 46 MSRP$2750 NWT

EXTREME NETWORKS F32FI 52021 SWITCH MODULE BRAND NEW!!!

HP 300GB 6G SAS 10K 2.5″ HARD DRIVE 518194-002 NEW!!!

HP ASSY EXPANSION PWR CHASSIS A5861-62027 NEW REFURB!!!

LUCENT FLEXENT CDMA RF TRANSMITTER AMPLIFIER KS24638-L1

SEVCON MILLIPAK MOTOR CONTROLLER PART# 633C23502

XP POWER AC/DC 600W SMD600PS24 24V/25A POWER SUPPLY NEW

BOSTON ACOUSTICS SOUNDWARE XS 5.1 SPEAKER SYSTEM

LAUREL J-730A HIGH EFF FRICTION CURRENCY BILL COUNTER!!

SUN/FUJITSU COPPER LINK I/O CARD 501-7041 M4000-M9000!!

EMC2 DISK FC ADAPTER MODULE 202-104-950C BRAND NEW NIB!

IBM 3583 POWER DISTRIBUTION BOARD PART # 19P3255

WYSE WINTERM V90LE 902144-51L THIN CLIENT 1.2G NEW NIB!

CONNECT TECH BLUESTORM BBG001 PCIE 4PT RS-232/422/485!​!

HP PROLAINT DL320 G5 SYSTEM MAIN BOARD 419408-001

QTY 5* SYMBOL 3805 LASER TERMINALS W/CRADLES +FAX MODEM

MOTION COMPUTING LE1600 CELERON M 1GHZ 768MB RAM SSD!!!

JUNIPER 320W AC POWER SUPPLY EX-PWR-320-AC BRAND NEW!

SUPERMICRO 6012P-6 INTEL XEON 2*2.4GHZ 4GB 3*18GB HDD!!

APC SUA1500 1500VA 120V SMART UPS BATTERY BACKUP

LG W2286L 22″ FLATRON LED HDMI LCD WIDESCREEN MONITOR

SCHNEIDER TELEMECANIQUE AC DRIVE ALTIVAR 61 ATV61HD15N4

EMC CLARIION 005047570 DISK ARRAY ENCLOSURE 11*146GB FC

SUN MICROSYSTEMS 540-6336 V440 MOTHERBOARD W/CPU CAGE!!

HAIER COMMERCIAL COOL CPN12XC9 PORTABLE AIR CONDITIONER

PACOM 1058-001 1058R-NA-UL FIELD CONTROLLER PCB NEW NIB

BENNING TEBECHOP RECTIFIER 12000 MODULE POWER SYSTEM!!!

MITSUBISHI DX-7000 DIGITAL CIRCUIT MULTIPLICATION DCME

CISCO CATALYST WS-C6K-13SLT-FA​N2 RACK MOUNT FAN TRAY!

IBM 42D0417 DS4200 4GB FC 300GB 15K RPM HARD DRIVE NEW!

CISCO AIR-LAP1242G-A-​K9 802.11G MODULAR ACCESS POINT!!

ATRICA DC POWER SUPPLY A-8000 AT80003 NEW

OMNITRON SYSTEMS ICONVERTER 10/100 DUAL FIBER 8383-1

QLOGIC SANBOX 5200 FIBRE FC STACKABLE SWITCH SB5200-20A

CISCO OPTICAL NET BACKPLANE 800-26100-03 15310-EIA-HD-A

CORELDRAW GRAPHICS SUITE X5 NEW NIB SEALED FULL RETAIL!

HP EF224A FLAT PANEL 24″ MONITOR 1920 x 1200 RES 2* DVI

ALCATEL 1-PORT 1000BASE-LX SFP OPTICS MODULE 3HE00028AA

GENUINE BROWN COWHIDE COW HIDE SKIN LEATHER RUG THROW

HP 300GB 6G 10K SAS 2.5″ DP DRIVE 507129-004 518194-002

NORTEL NTGS4993E5 T1/E1 TCCM CROSS CONNECT MODULE

HP POWER SUPPLY 32V FRU CC792-67059

HP 300GB 10K SAS 2.5″ HARD DRIVE 518006-002 493083-001

ENTERASYS C2RPS-PSM SECURESTACK C2 REDUNDANT BRAND NEW!

SAMSONITE HTL 1 GUSSET BROWN LEATHER BRIEFCASE 041 NWT!

IBM SEAGATE SAS 500GB 2.5″ 7.2K HARD DRIVE 9FY246-039

TRANSITION NETWORKS CBFTF1013-105 10/100BASE CONVERTER

HP 365695-009 300GB U320 10K SCSI HARD DRIVE W/TRAY

HP 431943-004 300GB SCSI 15K HOT SWAP 3.5″ HARD DRIVE

OTC LOW JACK STAND W 12 TON CAPACITY NEW !

DT4000 TRUCKPC HEAVY DUTY ONBOARD COMPUTER EMBEDDED XP

HP 300GB 15K SAS 3.5IN 481272-001 W/FC ADAPTER NEW NIB!

HONEYWELL H200 SELECT ELECTRIC CENTRAL VACUUM SYSTEM

GARMIN FORERUNNER 405 GPS ANT HEART RATE MONITOR WATCH!

SUPERMICRO SUPERSERVER 6015V-MT 1.6GHZ 2GB RAM 2*500GB

BLACKBERRY STORM 9530 UNLOCKED GSM ATT TMOBILE +8GB NEW

SYMBOL LS3408-ER 3408 RUGGED HANDHELD BARCODE SCANNER!!

WINNOV 16 CHANNEL VIDEO ONLY CAPTURE BOARD PCB-0016VO-W

HP PROLIANT DL380 DUAL 2.4GHZ XEON 4GB 4*72GB 10K

HP/COMPAQ 500W POWER SUPPLY 30-56245-01 ALPHASERVER

MECHANICAL INTEGRITY INC TWO-AXIS CONTROLLER +SKB CASE

7* MOTOROLA ADAPTUS FINGER SCANNERS F3137A W/BATTERY

TRANSACT ITHACA 8000 STICKY LABEL & RECEIPT PRINTER NEW

SUN PMC233 TELECOM BLADE SERVER CCPI CP2300 GC2PBDABAA

TOSHIBA 20 BUTTON 4 LINE SPEAKER PHONE DP5132-SD V2 NEW

IBM 530W POWER SUPPLY TDPS-530BB 42C2192 42C2140 DS3000

SECURITRON BOXED POWER SUPPLY BPS-24-3 3 AMP 220VAC

KWIK TEK AIRHEAD VIPER 3 RIDER SKI COCKPIT BOATING TUBE

DEWALT DW715 12″ SINGLE BEVEL COMPOUND MITER SAW NEW

SUN FIRE SUNFIRE 280R SERVER 2*ULTRASPARC USIII 900 4GB

XP AC/DC POWER SUPPLY MP 800W 800 WATT F8B6D4A3G3 NEW!!

DELL POWEREDGE 2850 2* 2.8GHZ SL7PD 6GB DDR2 4* 147GB

CARD TECHNOLOGY ADVANTAGE SERIES I PRINTER

QUARKXPRESS 7 QUARK XPRESS MAC/WIN UPGRADE BRAND NEW!!

HP 431943-004 300GB SAS 15K 3.5″ SINGLE PORT HARD DRIVE

PELICAN 1610 WHEELED CASE W/PHOTO FOAM & LID ORGANIZER!

AUDIOCARE RM SYSTEM 2.8GHZ DIALOGIC MAGJACK SI-20050

JUST CAVALLI ITTIERRE SHORT DRESS BLACK SIZE 44 NEW NWT

BILLABONG SG5 403 THE SOLUTION FULL WETSUIT MENS XL NEW

BLACKBERRY CURVE MOBILE PHONE 8530 VERIZON NEW!

ICT PFC POWER SUPPLY PPN6026B ICT24012-18A 13.8V 250W

HP 384854-B21 146GB SERVER HARD DRIVE 15K SAS 3GBPS

ZEBRA ELTRON BARCODE THERMAL LABEL PRINTER TLP 2844 NR!

CYBERPOWER BATTERY BACK UPS OR2200 OR2200LCDRM2U 2000VA

ENGENIO LSI SEAGATE 300GB SAS 15K HD ST3300657SS NEW

HONEYWELL PVL4022AS SPYDER PROGRAMMABLE VAV CONTROLLER

ADEMCO HONEYWELL VISTA-128BP ALARM CONTROL PANEL NEW

CAT CATERPILLAR MENS WATCH YELLOW STEEL YM 143 11 124

FOUNDRY NETWORKS RX-ACPWR-F-SYS POWER SUPPLY

CYFRE ANTENNA/AMP KIT DBSW819 +TRANSITION POE CONVERTER

SUN MICROSYSTEMS 146GB 15K U320 540-6494 HARD DRIVE

CUSTOM 1U SERVER 2* DC OPTERON 2.66GHZ 4GB 4* 250GB

DEVAR SMART CHART II STARTER KIT DATA LOGGER SCII-8K +

HONEYWELL ADEMCO HSB37NB HIDDEN BAR/STRIP WINDOW CAMERA

JUST CAVALLI ITTIERRE SHORT DRESS BLACK SIZE 40 NEW NWT

KITCHENAID KFPW760OB 700W 12 CUP FOOD PROCESSOR NEW NIB

QUORUM DAVENPORT 52″ CEILING FAN 65524-8 WHITE NEW NIB!

HORIZON HALF DOOR BEZEL 501426-B NEW REFURB

HONEYWELL EMM-3U UNIVERSAL MINIZONE ZONE PANEL

SYMBOL FIXED MOUNT COMPUTER AIDC TERMINAL FMT3000

RESTORATION HARDWARE OIL RUBBED WALNUT CEILING FAN NEW!

FLUKE NETWORKS ACCESSVIEW WITH BUS EXPANSION UNIT

CSI WIRELESS GPS MGL-3 LOOP ANTENNA P/N: 804-3003-05A

ANDERSON INSTRUMENTS CIRCULAR CHART RECORDER MACHINE

SUN 850 WATT SUN FIRE X4600 POWER SUPPLY 300-1971 NEW!!

DELL POWEREDGE 1750 XEON 2.8GHZ 1GB RAM 3*73GB U320 HDD

TANDBERG DATA DLT VS80 AUTOLOADER TDA1231-01 EXCELLENT

IBM FIBRE CHANNEL QUAD 2GBIT 2105 PCI ADAPTER 18P3456!!

LOT OF 115 NM9-6MF DB9M-F SERIAL EXTENSION CABLES NEW!!

EATON POWERWARE 100-240V IPC34XX ENCLSOURE PDU

LINEAGE POWER QS RECTIFIER QS852A R5 1:0D 20A/48V NEW!

MICROSEMI POWERDSINE 3506 POWER OVER ETHERNET POE

HP PROLIANT DL380 G4 SERVER 3.2GHZ 6GB RAM

HP PROLIANT SERVER DL380 G4 370596-001 3.2GHZ 6GB RAM

HEAT LAMP + BALLAST 60-12/24 HPS MH 600W LU600W MH600W

CISCO / STRATACOM POWER INPUT MODULE BPX-15 BRAND NEW!!

HUNTER PERMALIFE 756 AIR PURIFIER 30756 NEW

TOSHIBA P000423080 MOTHERBOARD FBMSY1 R10 R15 LAPTOP

110 PUNCH DOWN BLOCK TELECOM PATCH PANEL 1800 PINS NEW

MOLEX PRO PANEL CLX 100-00410-KIT SRG 0366610054 NEW!!!

ATEN ALTUSEN PN0108 POWER CONTROL UNIT POE ETHERNET

SYMBOL MICRO KIOSK SELF SERVICE LCD COMPUTER TERMINAL!!

HP PROLIANT DL380 G2 2*P3 1.33GHZ 6GB RAM 4* 36GB 2*PSU

CHEVY AVALANCHE 2002 LEATHER SEAT COVERS 60:40 PEWTER!!

FORD TAURUS 4D 03-04 LEATHER SEAT COVERS CAMEL TAN NEW!

FORD TAURUS 4D 03-04 LEATHER SEAT COVERS GRAPHITE NEW!!

FORD TAURUS 4D 03-04 LEATHER SEAT COVERS PEWTER NEW!!

HONDA CIVIC 4D SE/LX/EX 01-02 LEATHER SEAT COVERS GRAY

HONDA CIVIC 4D SE/LX 01-02 LEATHER SEAT COVERS GRAPHITE

HONDA CIVIC 4D SE/LX/EX 98-00 LEATHER SEAT COVERS GRAY

NISSAN ALTIMA S/SE 4D 02-04 LEATHER SEAT COVER GRAPHITE

TOYOTA CAMRY SE/CE/LE/XLE 02-04 LEATHER SEAT COVERS NEW

IBM 22R1720 QUAD P4 BERING 2GBIT FC BOARD W 4*2GB GBIC

FORD F-150 SUPER CREW 02-03 XLT LEATHER SEAT COVERS NEW

TOYOTA CAMRY SE/CE/LE/XLE 02-04 LEATHER SEAT COVERS NEW

HP PROCURVE 24-PT SWITCH J9080A J9080-69001 1700-24 NIB

HP PROLIANT 337054-001 DL360 2*3.06GHZ XEON 4GB 2*72GB!

IBM 8670-61X ESERVER XSERIE 2*2.8GHz 2GB 4*36GB 2*72GB!

HP SMART ARRAY P212 RAID CONTROLLER 462594-001 NEW NIB!

SUN X4100 SERVER MOTHERBOARD MAINBOARD 501-7261!!!!!

SUN MICROSYSTEMS CPU/MEMORY UNIBOARD 540-6079 w/ 4×900!

SUN MICROSYSTEMS 540-7355 2.5 146GB 10K SAS HARD DRIVE!

ROBERTS 10-950 75LB HEAVY DUTY LINOLEUM ROLLER NEW!!!

XSTORE NIKSUN ES-316R-A7 STORAGE ARRAY 2TB 8*250GB HDD

TRIPP LITE UPS SNMP REMOTE WEB ADAPTER SNMPWEBCARDTAA

COMTROL ROCKETPORT INTERFACE 8 RS 232/422 DB25F 99370-4


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。