1756-L61

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描述

1756-L61

一般来说,PLC是极其可靠的设备,出故障率很低。PLC的CPU等硬件损坏或软件运行出错的概率几乎为零;PLC输入点如不是强电入侵所致,几乎也不会损坏;PLC输出继电器的常开点,若不是外围负载短路或设计不合理,负载电流超出额定范围,触点的寿命也很长。输出模块分为晶体管、双向可控硅、接点型。晶体管型的开关速度最快(一般0.2ms),但负载能力最小,约0.2~0.3A、24VDC,适用于快速开关、信号联系的设备,一般与变频、直流装置等信号连接,应注意晶体管漏电流对负载的影响。可控硅型优点是无触点、具有交流负载特性,负载能力不大。
继电器输出具有交直流负载特点,负载能力大。常规控制中一般首先选用继电器触点型输出,缺点是开关速度慢,一般在10ms左右,不适于高频开关应用。

因此,我们查找电气故障点,重点要放在PLC的外围电气元件上,不要总是怀疑PLC硬件或程序有问题,这对快速维修好故障设备、快速恢复生产是十分重要的,因此笔者所谈的PLC控制回路的电气故障检修,重点不在PLC本身,而是PLC所控制回路中的外围电气元件。

PLC系统接地要求比较严格,最好有独立的专用接地系统,还要注意与PLC有关的其他设备也要可靠接地。多个电路接地点连接在一起时,会产生意想不到的电流,导致逻辑错误或损坏电路。
而产生不同的接地电势的原因,通常是由于接地点在物理区域上被分隔的太远,当相距很远的设备被通信电缆或传感器连接在一起的时候,电缆线和地之间的电流就会流经整个电路,即使在很短的距离内,大型设备的负载电流也可以在其与地电势之间产生变化,或者通过电磁作用直接产生不可预知的电流。在不正确的接地点的电源之间,电路中有可能产生毁灭性的电流,以至于破坏设备。PLC系统一般选用一点接地方式。为了提高抗共模干扰能力,对于模拟信号可以采用屏蔽浮地技术,即信号电缆的屏蔽层一点接地,信号回路浮空,与大地绝缘电阻应不小于50MΩ。

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主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA
  专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

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JAI CV-S2524 CCD COLOR CAMERA TWIN SERIES

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COMPUTER RECOGNITION SYSTEMS VME BOARD 8815CX528

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ATRICA AT40003 A-4000-00-AA SERIES DC POWER SUPPLY

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MOTOROLA / FORCE POWER CORE CPCI 690 256-700-32/PSB

IBM 08L9760 100/200GB LTO-1 Storage Tape

DIALOGIC MSI/240SC-R & 2X SI/80SC-R

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VIDEOSERVER MPU2 CARD 100-0080-00B VIDEO SERVER MPU 2

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SLEEVE (LINK) FOR VARIAN PUMP 7 INCH

TATTILE SMART READER F00465 ANALYZER 8MB S.R. M3

ALVARION DS11-RB-ESTI 812505 AN1095 2.4-2.7 GHz

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MOORE EQUATION STATION MDS/PRG/PRG/10-​30DC-MAO

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PHYSIK INSTRUMENTS HVPZT-AMPLIFIER E-507k013

SMC NP420-DM1

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YASKAWA SERVOPACK SGDA-A3CS SGDA-A3CSY203

AVAYA G700 CARD AM110 700439045 W/ 2GB 512mb

TADPOLE TP41V W/ TPRAM2 REV A VME MODUL

AirSpan Marconi WipLL BSR 3.7XGHZ 09100041 TDD

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AirSpan Marconi WipLL SPRL 900MHZ 09000100 NEW

GENERAL ELECTRIC SERIESONE IC610CHS114A RACK W/24VDC

AirSpan Marconi WipLL BSR 3.75xGHZ 09100084 TDD V-POL

PANASONIC MINAS MSD013A1XX AC SERVO DRIVER

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Nortel NTRX50CG 01 NNTM64501W95

ALVARION 4M-CPE-ODU-PRO-​2.5 725940 4M CPE ODU PRO 2.5

OLYMPUS Neo Splan 50x/0.70 ∞/- f=180 objective lens

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Schott KL1500LCD KL 1500 LCD

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FLUKE 187 TRUE RMS MULTIMETER

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POLESTAR N-10 MRI REMOTE CONTROL 506A0180-01

POLESTAR MRI REMOTE CONTROL 506A0246-01

RADWARE LINKPROOF 8FE 64MB SWITCH Ver. 3.73.03

UNIT UFC-1660 5 SCCM PN: 1660-106346

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TATTILE SMART READER F00755 ANALYZER 8MB S.R. M3 V.II

LEESON 985.603D NEW M1115025.00

Pulnix ASML CCD TV Camera TM-710i

MATROX GENESIS PRO GPRO/F/64

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MATROX GENESIS PRO GPRO/P/64/P/64

ALVARION RAINBOW AU ODU BAND G VER 3 ANTENNA

DIGITAL DECSERVER 900TM 76-200-0001 W/ DECHUB ONE

NIKON 4S019-235 C/D_I/F

MAXON DC MOTOR RE 75 + MAXON TACHO 250WATT NEW 279054

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SUN NETRA 120 DC 650MHz 1GB 73GBX2 HDD 3321469-3 NIB

Applied Materials Digital I/O Board 0100-20003

JAVELIN ELECTRONICS CHROMACHIP II JE3462RGB/E 12 VOLTS

SBC ADVANTECH PCA-6186 REV A1 PCA6186 PCA 6186 P 4 1.5g

DTT R2000 – ACCESS DATANG SU-RA-3.5A1 + SU-NI-1D-3.5A1

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MITSUBISHI INVERTER FR-PU03E FR-A024-0.4K

LAMBDA POWER SUPPLY ULTRAFLEX SERIES 400 WATT UAZ1JP

SBC 686LCD/MG100 P-I 133Mhz w/ 256 Ram 686LCD/MG

UNISYS 7009 8561-003 MODULE 802.3.CA

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ERICSSON / Tellabs MARTIS SXU-C MODULE ROA 117 3001/2

TERAYON CU DIGITAL BOARD 7000057 FOR TERALINK

MOTOROLA BOARD 01-W3739F

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20-00FBA-09 1GB 133MHZ 200 PIN ALPHASERVER MEMORY DIMM

DEC VT525 A6 DIGITAL COLOR TERMINAL BASE TESTED VT 525

NATIONAL INSTRUMENTS BUS EXPANDER / ISOLATOR GPIB-120A

ALVARION BreezeACCESS REP-NI-HP-2.4 824932 Cell Extende

AMERICAN DYNAMICS AD1404A VIDEO SWITCHER NEW

JAI CV-M30 High Speed CCD COLOR CAMERA

GAST VACUUM COMPRESSOR 1032-101-G618X NEW IN BOX

SUN MOTHERBOARD 375-0088 Ultra AXe 300MHz 512MB

Mitsubishi/Freq​rol FR-Z123-0.75K Inverter Drive 5A Out

Yaskawa Servopack Servo Drive SGDA-04AS 30 day warranty

COSMICAR / PENTAX TV ZOOM LENS 8-48mm 1:1.0 NEW

JAI CV-M10RS PROGRESSIVE SCAN

VMIVME-0427-140 VMEbus Module Board

MIO-PS120 W/ MIO-IDC-32-100 W/ MIO-ODC-32-200 W/ BASE 5

ASML/SVG PC Board P/N:865-8022-00​4

TDK POWER SUPPLY RKE48-32R

KEYENCE PZ-51 PHOTO SENSOR 2-824108-A NEW

OPTIBASE BPC 1846A VIDEO CARD PCI

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ATRICA AT20036 DC POWER SUPPLY FOR A-2140 301C0003-01

ATRICA AT20039 AC POWER SUPPLY FOR A-2140 AT20039-00-AA

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JAVELIN ELECTRONICS CHROMACHIP JE3362 CAMERA 12 VOLTS

Yamatake DMC50 DMC50CS DMC50CS400D0M00​1

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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


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。