OP-24027｝｝OP-24027

名称:工程设备CAN总线控制系统设计
1引言
工程设备的数字化、信息化及施工管理一体化是当前工程设备的发展热潮，自20世纪90年代始，发达国家的制造业就已经开始进行相关技术的探索，*大量应用于*的工程设备设计中。同时，以微计算机为代表的智能控制器被大量采用，智能节点间的信息流量*增加。将车载电子设备按照一定的协议联网，并加以有效地信息综合，使之达到资源和功能的共享已成为发展趋势。
现场总线技术是指把单个分散的测量控制设备变成网络节点，以现场总线为纽带，把它们连接成可以相互沟通讯息、共同完成自控任务的网络系统与控制系统。CAN（Controller Area Network）总线，又称控制域局域网，属于总线式串行通信网络，zui早由BOSCH公司在80年代提出，由于可靠性高、实时性强、灵活方便，便于检测维护，因而被广泛应用。在工程设备领域，美国CAT公司生产的CAT980G装载机，日本小松的WA380-3和WA500-3，日本川崎的KLD80ZⅢ等均采用CAN总线技术，提高设备的整体控制技术水平。
根据CAN总线的技术特点，本文设计了一种基于CAN总线的工程设备控制系统，通过分布式智能控制来提高工程设备的控制技术和信息化水平。
2系统组成与功能特点
2.1系统组成
传统的工程装备控制系统采用集中式控制，除主控制器外一般都不具备可智能化的条件。基于CAN总线的控制系统采用分布式智能总线控制，将各功能模块做成智能终端，再通过CAN总线连接，并辅之以一定的通讯协议，这样不仅提高了整个系统的可靠性及智能化水平，同时降低了系统的复杂程度。
系统由主控制器、操纵盒、传感器、执行机构和虚拟仪表等组成，各部件采用CAN总线互联。主控制器负责系统的信息协调与处理；作业终端是作业手对作业过程进行干预的主要手段；传感器负责感知系统的状态；执行器负责完成经主控制器处理后的动作；虚拟仪表提供了一种可视化的人机界面，用文字或图形的方式告知作业手器材当前的状态；调试诊断仪负责定位系统故障源。各模块都是自成一体的智能终端，各模块可以有多个，只要给它们分配不同的标识符（ID号）即可，各模块通过4芯屏蔽电缆并联起来，4芯电缆中2根（电源正和电源负）用于给终端供电，另外2根（CANH和CANL）用于终端间通信。本系统组成如图1所示。
图1基于CAN总线的智能控制系统组成
总线的智能控制系统组成
2.2系统功能特点
与传统的集中式控制系统相比，本控制系统具有如下功能特点：
（1）防误操作功能。设计人员可以很容易地通过软件编程屏蔽掉本系统中可能出现的误操作，而只开放允许的操作，同时还可根据需要发出声光报警，告知作业手有操作错误；
（2）作业向导功能。操纵盒的智能化和系统数据的共享使得设计人员可以根据作业过程，通过软件编程点亮相应的指示灯，告知作业手许可的操作。实现器材操作的“傻瓜”化；
（3）系统自我诊断自我恢复。智能化终端可以方便地对自身的状态进行诊断，并向总线发送相关信息供其它智能节点处理用，使器材使用者不用掌握太多的专业知识就可以容易地判断问题所在；同时对于总线内部错误，总线系统可以通过自身软件进行自动恢复
（4）状态指示。通过虚拟仪表或操纵盒指示灯指示器显示系统当前状态。
（5）数据共享，信息全面，可靠性高。系统的所有数据都可在CAN总线上接收到，可以很容易地实现信息共享，减少了数据的重复处理，降低了对主控制器的要求；同时CAN总线具有线间干扰孝抗*力强的特点。系统采用模块化管理，各模块按其功能分散布置，简化了布线并缩短了线束的长度，从而降低了耦合电流的产生，减小了线间干扰。同时在软件上，CAN总线采用短帧传输，这样使总线数据报文在传输过程中有较强的抗*力；（6）扩充性强，产品升级快，性价比高。
（7）参数配置灵活。可以通过CAN总线进行参数配置，如开关量可以根据厂家需求设置其门限及控制极性(正负控)，模拟量可根据厂家提供的传感器性能曲线进行校正，相关位置量也可以方便地进行总线标定，缩短产品调试时间。
3总线通讯协议设计
CAN通信协议主要描述设备之间的基于基本CAN通信的应用程序信息传递方式。CAN通信层的定义与开放系统互连（OSI）参考模型*，但只定义了zui下面两层：物理层和数据链路层。由于没有规定应用层，因此CAN协议本身并不完整，需要一个应用层协议来定义CAN报文中的标识符（11/29位）、8字节数据的分配与使用。目前上使用较多的高层协议有CANopen、J1939和DeviceNet等，但是由于工程设备的控制节点一般不多，*可以根据自身特点，设计高效的应用层协议。下面给出几个实用的设计方法。
3.1报文ID的设计
在通信标识符，即ID号分配时，对于关重信息帧或要求快速响应的信息帧采用低号ID，如装备控制中需要实时反馈信号的各作业机构到位信号；对于传递仅用于监测而不参与实时控制信号的信息帧应采用高ID号，如油温、油压、车姿等状态信息。
另外，在验收滤波器中对验收代码寄存器（ACR）和验收屏蔽寄存器（AMR）正确设置可以屏蔽与该节点不相干的ID号信息，可以提高有效信息的响应速度。
3.2报文的循环发送与查询发送
对于参与控制的重要信息帧一般应采取定时循环发送方式，保证信息的实时刷新；而对于软硬件版本查询、参数标定等需要临时数据服务的则主要采用C/S（客户机/服务器）方式进行信息帧发送，即进行特定的信息帧定义，当服务器收到客户机的参数查询或标定请求后再处理并发送相应的回馈信息郑
3.3“心跳”检测
当数据源节点退出总线后（故障或人为退出），接收节点相应的接收数据缓冲区的数据必须进行复位，防止数据不*造成非期望事件发生。因此，一般要求源节点定时发送“心跳”信息，即设计一特定的信息帧或把特定信息帧中的某一位设计成代表该节点的“心跳”，节点启动工作后每隔一定时间发送“心跳”信息帧或定义的“心跳位”高低电平变化一次，这样如果在一定的时间内没有收到该节点“心跳”信息，则可以判断节点不在总线上，进而做出相应的事件处理。
图2数据标定流程图
数据标定流程图
3.4传输错误检验
为了提高数据通讯的可靠性，对于关键数据帧（如标定数据帧），采用和校验的方式防止数据传输错误，即数据源节点将zui后一个数据字节定义为校验字节，采用累加和等校验等方式，将运算结果的低8位（即低位字节）作为校验数据值。数据接收节点收到数据帧后，通过运算进行比较，结果无误后再进行相应的赋值处理。
3.5数据查询与参数标定
数据查询和标定采用重复发送控制信息直到得到特定反馈信息才结束的通信方式，流程如图2所示。
4 CAN总线作业终端设计
将作业终端设计成一个智能节点，采用CAN总线通信，则可以减少连接线缆芯数的数量，提高工作可靠性；同时数据传输内容丰富，可以传递状态信息，也可以传送报文信息，提高信息化程度；并可增加通信距离，提高工作的适应性。
（1）硬件设计
基于带CAN总线控制器的单片机 PIC18F458系统设计，通过CAN总线收发器 MCP2551与其它节点总线相连，外围有开关量输入电路、模拟量输入电路、数码管显示电路、开关量输出电路、CAN收发器和电源电路等，见图3。
图3 CAN总线作业终端硬件原理框图
总线作业终端硬件原理框图
5主控制器设计
主控制器为主要的操作信号采集的执行单元，它将系统的操纵信号进行防误操作处理后控制作业机构的执行元件。
主控制器采用EPEC系列高可靠性可编程控制器（PLC）设计，该系列控制器在国内外工程机械中应用较广泛，具有两个CAN通讯口，本身即可兼做多协议的网关。该型控制器具有以下优点：抗电磁干扰、抗振动、耐油、适应环境能力强、结构紧凑、密封性好、具有自我保护能力的特点，可以*在野外恶劣环境条件下工作，可以直接驱动多种执行器，如电液比例阀、伺服马达等，特别适用于移动设备的使用。当然，就CAN系统作业集成角度来看，STW，INTER CONTROL等控制器的性能也较好，各有其特色，可以根据控制需求进行选择。
6虚拟仪表设计
虚拟仪表主要用于终端显示，以提供各种作业信息。选用PC104主板作为嵌入式计算机系统的硬件，硬件配置表如表1所示，软件采用实时性好的VxWorks操作系统，利用VxWorks BSP包完成移植。
表1虚拟仪表硬件配置表
虚拟仪表硬件配置表
虚拟仪表可以完成工作状态显示、传感器数据标定、视频显示等，提供了良好的人机交互界面，并可以通过RS232接口接入导航定位信息，提高装备的信息化程度。
7 CAN总线调试诊断仪设计
调试诊断仪基于BIT技术，采用嵌入式系统架构，硬件以ARM控制器为核心。ARM系列处理器采用32位嵌入式RISC结构，内部集成多级流水线以提高处理器指令的执行速度，其强大功能与外围电路的配合，将信号采集、处理、故障诊断及网络通信等功能集于一体，特别适合作为智能仪器设备的开发平台。 HMS30C7202是基于ARM720T的32位处理器，包括了PC机的所有基本功能。具有高性能低功耗的特点，片内资源非常丰富，具有*的集成度，非常适用于嵌入式系统应用。调试诊断设备硬件由基于ARM芯片 HMS30C7202的核心模块加外围电路组成，见图4。为了充分发挥ARM芯片的效率，提高任务级的响应时间，采用实时内核C/OS-II来进行资源管理。C/OS-II是一个完整、可移植的抢占式实时多任务操作系统，具有执行效率高、占用空间孝实时性能优良和可扩展性强的特点。用户界面基于MiniGUI平台进行开发，*地提高了人机交互性能。
图4调试诊断仪硬件架构
调试诊断仪硬件架构

本公司主营产品：
DCS集散式控制系统、PLC可编程控制器、数控系统、
(CPU处理器、模块、卡件、控制器、伺服驱动、工作站、驱动器、
马达、 内存卡、 电源，机器人备件等)各类工控产品

◆ 企业名称：厦门兴润星贸易有限公司

◆ 企业性质： 有限责任公司

◆ 主营业务：DCS,PLC

◆ 经营模式： 贸易

◆ 贸易地区： 全国

◆ :阳

◆ 商务：

◆

◆ :

◆ （备注“0028”收）

◆ ：

◆ 旺旺：xmxrx0028

◆ 邮政编码：361000
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MINN KOTA SALTWATER ENGINE MOUNTED RT55EM 12V 55LB 1370615
MINN KOTA SALTWATER ENGINE MOUNTED RT55EM 12V 55LB 1370615
MINN KOTA SALTWATER ENGINE MOUNTED RT160EM 24V 160LB
Minn Kota RT80EM Engine Mount Saltwater Trolling Motor 24v-80lb
Minn Kota RT80/EM Engine Mount Saltwater TROLLING MOTOR 80 Pound 24v 1370625
Minn Kota RT80/EM Engine Mount Saltwater Trolling Motor 24V-80lb 1370625
Minn Kota RT80/EM Engine Mount
Minn Kota RT55EM ENGINE MOUNT Saltwater TROLLING MOTOR
Minn Kota RT55/EM Engine Mount Saltwater Trolling Motor 12V-55lb 1370615
Minn Kota RT55/EM Engine Mount Saltwater Trolling Motor 12V-55lb 1370615
Minn Kota RT160/EM Engine Mount
Minn Kota MK80EM Freshwater Engine Mount Trolling Motor 24v-80lb
Minn Kota MK80EM Freshwater Engine Mount Trolling Motor
MINN KOTA MK55EM ENGINE MOUNTED 55LB THRUST 12V 1370610
MINN KOTA MK55EM ENGINE MOUNTED 55LB THRUST 12V 1370610
Minn Kota MK55/EM Engine Mount Freshwater Trolling Motor 12V-55lb 1370610
Minn Kota MK55/EM Engine Mount
Minn Kota MK101EM Freshwater Engine Mount Trolling Mtr
Minn Kota MK101EM Freshwater Engine Mount Trolling Motor 36v-101lb
Minn Kota MK101EM Freshwater Engine Mnt Trolling Motor WORLDWIDE SHIP 1370630
Minn Kota Mk101em Engine Mounted 101lb Thrust 36v 1370630
Minn Kota MK101/EM Engine Mount
Minn Kota FW MK80/EM Engine Mount Trolling Motor
Ming
MINCO CT15021 TEMPERATURE CONTROLLER 100-240VAC SSRALA
MILLER FLUID POWER APL4093101 USPP APL4093101
Millennia Media AD-596
Millennia AD-596 Analog-Digital Converter
MID S5 Google Android 2.2 7’ Touchscreen Tablet PC
MICROSTAR MSXB-017-03 I/0 BOARD MSXB01703 NIB 
Microsoft BASIC Professional Development System
Microseven EXView CCD18X High Speed Dome Wireless H.264 PTZ IP Camera Mac Ready
Microseven EXView CCD18X High Speed Dome Wireless H.264 PTZ IP Camera Mac Ready
Microseven EXView CCD 26X High Speed Dome Wireless H.264 PTZ IP Camera Mac Ready
MicroNet RAIDBank5 RB5-15000 DAS Hard Drive Array 5 x HDD Installed 15 TB In
Microfast Controls SMF-M1480-010 SMFM1480010 I/O Module Rack 
Microelettrica Scientifica mc30 Three-Phase Overcurrent and Earth Fault Relay 
Microbot TeachMover Robot Kits  Parts and Boards 
Micro Industries MVME605 I/O Module  No Box
Metasonix KV-100 AssBlaster Multi-Effects-​
MEMUSB-1024FT 1GB USB FLASH TOKEN
MEMOTEC 30033001-007 USPP 30033001007
MEM-NPE-G2-2GB for Cisco NPE-G2 Fast Ship w/wrnty
MEM-NPE-400-25​6MB 256MB MEMORY FOR CISCO NPE-400 7200 SERIES
MEM-CF-512MB 512MB FLASH MEMORY FOR CISCO 1900 2900 3900 ISR
MEM-CF-256MB 256MB COMPACT FLASH FOR CISCO 1900 2900 3900 ISR
MEM-CF-256MB 256MB COMPACT FLASH FOR CISCO 1900 2900 3900 ISR
MEM-CF-1GB 1GB COMPACT FLASH FOR CISCO 1900 2900 3900 ISR
MEM3800-512D 512MB DRAM MEMORY FOR CISCO 3825/3845
MEM3800-256D 256MB DRAM MEMORY FOR CISCO 3825/3845
MEM3800-128CF 128MB FLASH MEMORY FOR THE CISCO 3825/3845
MEM2800-64U256​CF 64 TO 256 MB CF UPGRADE FOR CISCO 2800 SERIES
MEM2600XM-32FS 32MB FLASH SIMM FOR CISCO 2600XM SERIES
MEM2600XM-16FS 16MB FLASH SIMM FOR CISCO 2600XM
MEM2600-32D 32 MB DRAM FOR CISCO 2600 SERIES
MEM-256M-AS54 256MB MAIN SDRAM FOR CISCO AS5400
MEM1700-64D 64MB DRAM DIMM FOR CISCO 1700 SERIES
MELSEC Mitsubishi A68AD Analogue Input Module 8 Channel Excellent Cond
Mellanox InfiniHost III Lx Infiniband MHGS18-XTC
MEDAR I/O MODULE 5305-B
MEASUREX 51304483-100 USPP 51304483100
Measurex 05331100 VFC 40 500k Honeywell 
Measurex 05331100 VFC 40 500k Honeywell 
Measurex 05331100 VFC 40 500k Honeywell 
Measurex 05329500  05329600 diagnostic break point 
Measurex 05319100 high density contact output buffer
Measurex 05312900 floppy interface Honeywell
Measurex 05312600 Send Receive Buffer SRB Honeywell
Measurex 05291202 Contact I/O Honeywell
Measurex 05291200 Contact I/O Honeywell
Measurex 05291000 Honeywell replaced  05367601
ME-3400G-2CS-A CISCO Multi-layer Ethernet Access Switch
ME-3400G-2CS-A CISCO Multi-layer Ethernet Access Switch
McIntosh MHT-100 A/V System Controller 
MC7090 Wireless Enterprise Digital Assistant MC7090-PK0DJRF​A7WR MC7090-PK0DJRF
MC7090 Wireless Enterprise Digital Assistant MC7090-PK0DJRF​A7WR 
MBD-X7DVL-L-O Motherboard Standard Retail Pack 
MAXXESS BLP 201 READER BOARD  QUAD OUTPUT MODULE WITH ENCLOSURE
MAXXESS BARLOCK 200 READER BOARD  QUAD OUTPUT MODULE WITH MOUNTING BRACKET
Marposs E4N LVDT Amplifier Module 2 Input E4NLVDT 
MARINE GPS NAVIGATION SYSTEM CAV-2000
MARINE GPS NAVIGATION SYSTEM CAV-1000
MARINE ELECTRO PROCESS MCB-16DIO/10.P​1 USPP MCB16DIO10P1
Marconi FORE Net Mod PN: NM-/622SMLRE 1YR 
Marconi FORE Net Mod PN: NM-/622SMIRLC 1YR 
MAN ROLAND 16.86926-0008 NSPP 16869260008
MAN ROLAND 16.86926-0008 NSFP 16869260008
Make offers ships to We buy OFF LEASE EQUIPMENT
Lynx TWO-C Soundcard  Free International 
Lynx Two-C 6 In 2 Out 192KHz AD/DA PCI Sound Card
Lynx Two-B 2 In 6 Out 192KHz AD/DA PCI Sound Card
Lynx Two-A 4 Analog I/O 192KHz AD/DA PCI Sound Card
Lynx Two-A 4 Analog I/O 192KHz AD/DA PCI Audio Interface
Lynx LynxTWO-C 192 kHz Multichannel Audio Reference
Lynx LynxTWO-B 192 kHz Multichannel Audio Reference
Lynx LynxTWO-A Multi-Channel Reference PCI Card 
Lynx LynxTWO-A 192 kHz Multichannel Audio Reference
Lynx LS-AES 8-Channel Expansion Soundcard Brand 
Lynx Aurora 8 D/A  A/D ConverterHD Card2 Lynx CablesWarra​nty
Lynx Aurora 16-VT HD with installed LT-HD interface
Lynx Aurora 16 D/A  A/D ConverterUSB Card4 Lynx CablesWarra​nty
Lynx Aurora 16 D/A  A/D ConverterHD Card4 Lynx CablesWarra​nty
LYNGSO MARINE IOM402 USPP IOM402
LUMBERG 0970-PSL-115 NSFP 0970PSL115
Lucent ica 89-0360-A DS-1 I/O Front module BA9IAA0AA
Lucent PSAX NS20N360KD 1250/2300 6-PORT ENHANCED
Lucent Excel VSE-BSU CPU I/O 16-span ESX-T1C T-One MIO 
LSI/3Ware 9750-4I 4-Port 6G/s PCI Express SAS RETAILBOX
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI Logic SAS/SATA ESM RoHS I/O Module M101651 Engenio 24199-00 24198-00 
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card 
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card 
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card 
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00280 MegaRAID 4-port 9260CV-4i SAS RAID Controller
LSI Logic LSI00280 MegaRAID 4-port 9260CV-4i SAS RAID Controller
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI 3ware SAS 9750-24i4e PCIe 2.0 8X 6Gbps per channel
LSI 3ware SAS 9750-24i4e PCIe 2.0 8X 6Gbps per channel
LS INDUSTRIAL SYSTEMS G4Q-TR4A USPP G4QTR4A
Loughborough Sound Images LSI DBV44 VME MVME
78 OPTO 22 IAC5 I/O MODULE IAC5 OPTO 22 IAC5
5 HP Compaq 6000 Pro SFF Desktop PC/Dual Core 2.8GHz/8G DDR3/Windows7 Pro
5 HP Compaq 6000 Pro SFF Desktop PC/Core 2 Duo E7200 2.53GHz/8G/Win​dows 7
5 Allen Bradley 1746-OW16 /C 1746-0W16 Relay Output 
3 allen bradley 1785-ka3 1785-enet 1771-asb c
2 HP Compaq 6000 Pro SFF Desktop PC/Dual Core 2.8GHz/8G DDR3/Windows7 Pro
2 HP Compaq 6000 Pro SFF Desktop PC/Core 2 Duo E7200 2.53GHz/8G/Win​dows 7
2 ALLEN BRADLEY 1794-IB16 /A FLEXLOGIC INPUT MODULE
10 Allen Bradley 1734-OB4E /C 1734-0B4E 24VDC Output Modules
 for Cisco WS-SUP720-3B 720 Supervisor Engine Grade A 
 Allen Bradley SLC 500 Analog Combination I/O 1746-NIO4V Ser A 
 10x ASUS P4SDX SIS655 P4 Motherboard 478 DDR333
Longline GLC-LH-SM for CISCO GE SFPLC CONNECTOR LX/LH TRANSCEIVER
Logic Control LM3016E 
LNC 2009 Mfg date 1794-IF4I Allen Bradley Flex I/O Analog Input 1794IF4I N250
LNC 2009 mfg date 1794-IF4I Allen Bradley Flex I/O 1794IF4I N814
LNC 11/2011 mfg 1746-NI8 frn 2 Allen Bradley SLC 500 Analog 1746NI8 N912
Like No Box.
Lifetime Manufacturer  ships same 
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
LG INDUSTRIAL SYSTEMS GDL-TR4C1 NSFP GDLTR4C1
LG INDUSTRIAL SYSTEMS GDL-TR2C1 NSFP GDLTR2C1
LG INDUSTRIAL SYSTEMS GDL-D24C NSFP GDLD24C
LEXICON digital effects processor MX-300 BRAND 
Lenovo ThinkStation S20 Workstation XEON W3503 2.4GHz
Lenovo ThinkStation E31 2555 Xeon E3-1225V2 3.2 GHz Brand 
Lenovo ThinkStation D20 4105 Workstation PC In Xeon 3.06GHz 4GB 500GB HDD 
Lenovo ThinkStation D20 4105 Workstation PC In Xeon 3.06GHz 4GB 500GB HDD 
Lenovo ThinkStation 782457U WorkstationXe​on 3.3GHz4G500G​BQuadro 2000W7Pro
Lenovo ThinkStation 782457F WorkstationXe​on 3.3GHz4G500G​BQuadro 2000W7Pro
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black 
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black 
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkPad X230 Laptop i5-3320M 4GB RAM 500G HDD W7P DVDRW 232036U
Lenovo ThinkPad X230 Laptop i5-3320M 4GB RAM 500G HDD W7P 12.5" W7P 232036F
Lenovo ThinkPad X230 Laptop i5-3320M 4GB RAM 500G HDD W7P 12.5" 343522U
Lenovo ThinkPad X230 Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 12.5" 232032U
Lenovo ThinkPad X230 34352TU 12.5" LED Tablet PC Core i7 i7-3520M 2.9GHz Bla
Lenovo ThinkPad X230 343522U 12.5" LED Tablet PC Core i5 i5-3320M 2.6GHz Bla
Lenovo ThinkPad X220T i5-2520M 4GB 320G W7P 12.5"
Lenovo ThinkPad X220 Tablet 4296 Core i7 2.8GHz 128GB SSD 42963UU 12in
Lenovo ThinkPad X220 Laptop In i5-2450M 4GB RAM 320G W7P 12.5" W7P 42875TU
Lenovo ThinkPad X220 Laptop i7-2640M 4GB RAM 128G SSD 12.5" W7P 428767U
Lenovo ThinkPad X220 Laptop i7-2640M 4GB 128G SSD 12.5" W7P 428757U
Lenovo ThinkPad X220 Laptop i5-2520M 4GB 320G 42872WU
Lenovo ThinkPad X220 Laptop i5-2450M 4GB RAM 320G HDD W7P 12.5" 42875TF
Lenovo ThinkPad X220 Core i7-2640M/4GB/1​28GB SSD/12.5"/Webc​am/Win7 428757U
Lenovo ThinkPad X220 Core i7-2640M/4GB/1​28GB SSD/12.5"/Webc​am/Win7 428757U
Lenovo ThinkPad X220 42962WU 12.5" LED Tablet PC Core i5 i5-2520M 2.5GHz BLK
Lenovo ThinkPad X220 42962WU 12.5" LED Tablet PC Core i5 i5-2520M 2.5GHz Bla
Lenovo ThinkPad X220 4290 429034U 2.5GHz Core i5 2520M 320GB Laptop
Lenovo ThinkPad X220 428767U 12.5" LED Notebook Core i7 i7-2640M 2.80GHz Bla
Lenovo ThinkPad X220 428743U 12.5" LED Notebook Core i5 i5-2430M 2.4GHz Blac
Lenovo ThinkPad X220 428742U 12.5" LED Notebook Finger Print Reader Bluetooth
Lenovo ThinkPad X220 42872WU 12.5" LED Notebook 320GB HDD Bluetooth Webcam 9.2Hr
Lenovo ThinkPad X220 4287 In Core i7 2640M 2.8GHz 128GB SSD Laptop
Lenovo ThinkPad X201 3113ED9 12.1" LED Tablet PC 
Lenovo ThinkPad W520 Laptop i7-2860QM 8GB RAM 500G HDD W7P DVDRW 15.6" 42763LU
Lenovo ThinkPad W520 Laptop i7-2760QM 8GB RAM 500GB HD W7P 15.6" DVDRW 42763JU
Lenovo ThinkPad W520 Laptop i7-2760QM 8GB RAM 500G HDD 15.6" DVDRW 42763JF
Lenovo ThinkPad W520 42763LU 15.6" LED Notebook Core i7 i7-2860QM 2.50GHz PN 
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763JU 15.6" LED Notebook Core i7 i7-2760QM 2.4GHz PN 4
Lenovo ThinkPad W520 42763JU 15.6" LED Notebook 500GB HDD 8GB RAM 10.8Hr Bat 
Lenovo ThinkPad W520 42763JF 15.6" LED Notebook 500GB HDD 8GB RAM 10.8Hr Bat 
Lenovo ThinkPad W500 WORKSTATION  ISV CERTIFICATIONS 
Lenovo ThinkPad T530 Laptop i7-3520M 4GB RAM 500G HDD W7P 15.6" NVS 5400M DVDRW
Lenovo ThinkPad T530 Laptop i5-3320M 4GB RAM 500G HDD W7P DVDRW 239242U
Lenovo ThinkPad T530 Laptop i5-3320M 4GB RAM 500G HDD W7P DVDRW 15.6" 239245U NV
Lenovo ThinkPad T530 239245U 15.6" LED Notebook Core i5 i5-3320M 2.6GHz Blac
Lenovo ThinkPad T530 239242U 15.6" LED Notebook Core i5 i5-3320M 2.6GHz Blac
Lenovo ThinkPad T530 239242U 15.6" i5-3320M 2.6GHz 4GB 500GB Windows 7 
Lenovo ThinkPad T530 239242U 15.6" i5-3320M 2.6GHz 4GB 500GB Windows 7
Lenovo ThinkPad T530 239242U 15.6" i5-3320M 2.6GHz 4GB 500GB Windows 7
Lenovo ThinkPad T520 Laptop i5-2540M 4GB RAM 128G SSD W7P 15.6" DVDRW 424053U
Lenovo ThinkPad T520 Laptop i5-2450M 4GB RAM 320G HDD 15.6" DVDRW W7P 42395CU
Lenovo ThinkPad T520 Laptop i5-2450M 4GB 320G W7P DVDRW W7P 15.6" 42395CF
Lenovo ThinkPad T520 42406MU 15.6" LED Notebook 500GB HDD 4GB RAM 14Hr Bat 
Lenovo ThinkPad T520 42404AF 15.6" LED Notebook Core i5 Bluetooth DisplayPort
Lenovo ThinkPad T520 42404AF 15.6" LED Notebook Core i5 Bluetooth DisplayPort
Lenovo ThinkPad T520 42395CF 15.6" LED Notebook 320GB HDD Bluetooth Webcam 7.7Hr
Lenovo ThinkPad T520 423946U 15.6" LED Notebook Core i5 i5-2520M 2.5GHz Blac
Lenovo ThinkPad T520 423946U 15.6" LED Notebook 320GB HDD Bluetooth Webcam 7.7Hr
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946F 15.6" LED Notebook 4GB RAM 7.7Hr Bat Bluetooth 
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UU
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UU
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UF
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UF
Lenovo ThinkPad T430s 23535UU 14" LED Notebook Core i5 i5-3210M 2.5GHz Black
Lenovo ThinkPad T430 Laptop i7-3520M 4GB RAM 500G HDD DVDRW W7P 14" 23445PU
Lenovo ThinkPad T430 Laptop i5-3320M 4GB RAM 500G HDD W7P 14" DVDRW 23445GU
Lenovo ThinkPad T430 Laptop i5-3320M 4GB RAM 500G HDD W7P 14" DVDRW 23442HF
Lenovo ThinkPad T430 23445GU 14" LED Notebook Core i5 i5-3320M 2.6GHz Black 
Lenovo ThinkPad T430 2344-2HU 14" LED Notebook Core i5 i5-3320M 2.6GHz Black
Lenovo ThinkPad T420S Laptop i5-2540M 128GB SSD 417153F
Lenovo ThinkPad T420s 417152F 14" LED Notebook 320GB HDD Webcam Bluetooth 5.5Hr 
Lenovo ThinkPad T420s 4171 Core i7 2.8GHz 41717FU 14in W7pro 160GB SSD
Lenovo ThinkPad T420 Laptop i5-2520M 4GB RAM 320G HD W7P DVDRW 14" 4177Q5F
Lenovo ThinkPad T420 Laptop i5-2520M 4GB 320G W7P DVDRW 14" 4177Q5U
Lenovo ThinkPad T420 Laptop i5-2450M 4GB RAM 320G HD DVDRW W7P 14" 4177RVU
Lenovo ThinkPad T420 4236X08 14" LED Notebook Core i3 i3-2350M 2.3GHz Black 
Lenovo ThinkPad T420 4236X08 14" i3-2350M 2.3GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4236X08 14" i3-2350M 2.3GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4236X08 14" i3-2350M 2.3GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4178C9F 14" LED Notebook 500GB HDD Bluetooth Webcam 9Hr Bat
Lenovo ThinkPad T420 41786UU 14" LED Notebook Core i5 i5-2520M 2.50GHz Black
Lenovo ThinkPad T420 41786UU 14" LED Notebook Core i5 i5-2520M 2.50GHz Black
Lenovo ThinkPad T420 41786UF 14" LED Notebook 500GB HDD 9HR Bat Webcam Bluetooth
Lenovo ThinkPad T420 4178 In Core i5 2520M 2.5GHz 160GB SSD Laptop
Lenovo ThinkPad T420 4177X07 14" LED Notebook Core i3 i3-2310M 2.1GHz Black 
Lenovo ThinkPad T420 4177X07 14" i3-2310M 2.1GHz 4GB 320GB Windows 7
Lenovo ThinkPad T420 4177X07 14" i3-2310M 2.1GHz 4GB 320GB Windows 7
Lenovo ThinkPad T420 4177X05 14" LED Notebook Core i3 i3-2310M 2.1GHz Black 
Lenovo ThinkPad T420 4177X01 14" LED Notebook Core i3 i3-2310M 2.10GHz Black
Lenovo ThinkPad T420 4177X01 14" i3-2310M 2.10GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4177X01 14" i3-2310M 2.10GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4177X01 14" i3-2310M 2.10GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4177RVU 14" LED Notebook i5-2450M 2.50GHz Bluetooth Webcam
Lenovo ThinkPad T420 4177RVF 14" LED Notebook 320GB HDD Webcam 9HR Bat Bluetooth
Lenovo ThinkPad T420 4177RVF 14" LED Notebook 320GB HDD Webcam 9HR Bat Bluetooth
Lenovo ThinkPad T420 4177Q5U 14" LED Notebook Black Core i5 Webcam DisplayPort
Lenovo ThinkPad T420 4177Q5U 14" LED Notebook 320GB HDD 9HR Bat DisplayPort 
Lenovo ThinkPad T420 4177 In Core i5 2430M 2.4GHz 4GB 320GB 14in
Lenovo ThinkPad T410 2522KJU 14.1" LED Notebook Core i5 i5-540M 2.53GHz Blac
Lenovo ThinkPad L520 Laptop i5-2520M 4GB 320G 786035U
Lenovo ThinkPad L520 Laptop i5-2520M 4GB 320G 786035F
Lenovo ThinkPad L412 058542U 14" LED Notebook Core i5 i5-520M 2.4GHz Black 
Lenovo ThinkCentre M91P 7052 Desktop In i7 Quad Core 3.4GHz 4GB DDR3 1TB 
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo M91p 7052C9U Desktop PCi7-26004GB​1TBHD2000W7​Pro
Lenovo M91p 7052C9F Bilingual Desktop PCi7-26004GB​1TBHD2000W7​Pro
Lenovo M91p 7052C2U Desktop PCi5-24004GB​250GBHD2000​W7Pro
Lenovo M91p 7052B9U Desktop PCi7-26004GB​500GBHD6450​W7Pro
Lenovo M91p 7052B9U Desktop PCi7-26004GB​500GBHD6450​W7Pro
Lenovo M91p 7052B2U Desktop PCi7-26004GB​500GBW7Pro
Lenovo M91p 7052B2F Bilingual Desktop PCi7-26004GB​500GBW7Pro
Lenovo M91p 4480C2F Bilingual Desktop PCi7-26004GB​1TBW7Pro
Lenovo M91p 4480B9U Desktop PCi5-24004GB​250GB W7Pro
Lenovo M91p 4480B3U Desktop w/i7-2600 4GB 500GB W7Pro
Lenovo M91p 4480B3FBiling​ual Desktop w/i7-2600 4GB 500GB W7Pro
Lenovo M81 7518E1U Desktop PCi5-24004GB​500GBW7Pro
Lenovo M81 7518D7U Desktop PCi3-21204GB​250GBW7Pro
Lenovo M81 7518D4U Desktop PCi3-21304GB​320GBW7Pro
Lenovo M81 7518D4F Bilingual Desktop PCi3-21304GB​320GBW7Pro
Lenovo M81 7517C1U Desktop PCi5-24004GB​500GBHD2000​W7Pro
Lenovo M81 7517C1F Bilingual Desktop PCi5-24004GB​500GBHD2000​W7Pro
Lenovo M81 7517B1U Desktop PCi3-21304GB​320GBHD2000​W7Pro
Lenovo M81 7517B1F Bilingual Desktop PCi3-21304GB​320GBHD2000​W7Pro
Lenovo 833214U 6 TB 2U Rack-mountable Secure Managed Client Network Storage
LEEDS  NORTHRUP 074429 NSPP 074429
Lavry 4496-12 2 Channel ADC  2 Channel DAC Converter
LATEST Revision R3.0 SuperMicro PDSME Bulk Pack MB FULL MFR 
LATEST Rev R2.01a​SuperMicro H8DME-2 Bulk Pack MB FULL MFR 
LATEST Rev R2.01 SuperMicro H8DAR-T Bulk Pack MB FULL MFR 
LATEST Rev R1.1 SuperMicro X6DHR-IG2 Bulk Pack MB FULL MFR 
LATEST Rev R1.02 SuperMicro H8QMI-2 Bulk Pack MB FULL MFR 
LATEST Rev R1.01 SuperMicro X7DWU Motherboard FULL MFR 
LASER PARALLEL/USB HP P3005X WITH NETWORK DUPLEXER AND ADDITIONAL 500 Q7816A 
Landis A121836 I/O Module Base A120276  No Box
LANDIS  GYR 549-210 NSFP 549210
LANDIS  GYR 549-209 USPP 549209
L5201-2-02 SSD Analog I/O Module Diff Link L5201202 In Excellent Condition
Krauss Maffei TE500 Control Board TE-500 5089390 
Krauss Maffei SR501 Control Board SR-501 5089435 
Krauss Maffei DT100 AE1 LS Control Board DT-100 
KRAUSS MAFFEI CORP. 5088020 IO 502 CARD
Krauss Maffei 5080188 CPU Board MC2/MC3 
Koyo Direct Logic PLC Rack w/ CPU  Touchscreen 3498
Koyo Direct Logic 6 D0-06DD1 I/O Module DC Micro PLC 
KOYO Automation Direct Logic DL205 with D2-240 F2-04AD-2 D2-16ND3-2 and D2-08TRS
Koyo Automation Direct Logic 205 D2-250 F2-02DA-2 D2-16NA D2-12TA D2-06B TESTED
Korg M3 73 73-key Workstation/Sa​mpler Keyboard
Korg M3 61 61-key Workstation/Sa​mpler Keyboard
Korg Electribe ESX1SD with Built-in SD Card  
KONTRON CTM80-2 REAR I/O T6701AC FOR DT64/CP6010/CP​6000
KONGSBERG RAI-16 USPP RAI16
KONGSBERG RAI-16 USPP RAI16
KONGSBERG NN-791/HER-100​261H USPP NN791HER100261​H
KONGSBERG 6200263 USPP 6200263
Knight Rider 7 Inch Android 2.3 Car DVD with 3G Internet.
Kloehn Syringe V6 VersaPump Pump 26044
KLOEHN CO. LTD V8 Multi-Channel Syringe Pump 250ml standard syringe
KLOCKNER MOELLER EM4-101-AA2 USPP EM4101AA2
KLOCKNER MOELLER EM4-101-AA1 USPP EM4101AA1
Kingston/StorC​ase Data Silo DS500 9-Bay/Hard Drive Ultra-SCSI RAID Storage Tower
Kikusui KSG4310 FM/AM Stereo Signal Generator
Keyence PLC Controller KV-16R and 2 I/O Modules KV-8ER Nice Shape
KEYENCE CORP KL32CT USPP KL32CT
KET KAT-SP COUNTER CONTROL ASSEMBLY W PUSH TO LIGHTSW
KEP SCPTHMS16P3C5D​1A 6 DIGIT LED COUNTER W PRESET 110VA
Kensington 4000A 5-Axis Controller Compley Optioned
Keithley MSSR-32 BD PC6432 Rev A Circuit Board Module
Just add your E7-4800 processor IN Like condition
Juniper SSG-5-SH Juniper Secure Services Gateways 
Juniper SSG-550-001 Secure Services Gateway 550
Juniper SSG-20-SH-W Juniper Secure Services Gateway 20 1 Year Wtny
Juniper SRX5K-4XGE-XFP 4x10 Gigabit XFP Ethernet I/O  COUIAUFBAD
Juniper SRX5800 Firewall SRX5800BASE-DC 150Gbps Security Gateway Free Ship
Juniper SRP-5G 5-Gbps switch fab Mod ERX-5ECC-SRP ERX 
Juniper OC3-4SM_I/O 4Port SM IOA for OC3/OC12-ATM ERX-OCXA256M-M​OD OC3/OC12-POS
Juniper OC12-SM_I/O ERX 1-Port OC12STM4 SM I/O 90 Hardware  Free Ship
Juniper NS-ISG-TX2 2prt 10/100/1000TX Ethernet ISG-2000 90  Hardware 
Juniper NS-ISG-SX2 ISG I/O Module two Port Mini GBIC-SX Free Overnight Ship
Juniper NS-ISG-SX2 ISG I/O Module two Port Mini GBIC-SX 
Juniper NS-ISG-LX4 4-Port I/O Module ISG-2000 ISG-1000 90   Free Ship
Juniper NS-ISG-FE8 8 Port 100bT for ISG-1000 ISG-2000 90  Hardware 
Juniper NS-ISG-2000 NS-ISG-SX2 NS-ISG-FE8 90   
Juniper NS-ISG-2000 Firewall NS-ISG-TX4 NS-ISG-1XG AC 90   Free Ship
Juniper NS-ISG-1XG ISG1000 and ISG2000 I/O Module 1-port 10GB 1 YEAR 
Juniper NS-500-SK1 FirewallVPN Netscreen 500 Adv  90  
Juniper NS-500-HG1-SX NS-500 Single Port SX Module 90   Free Ship
Juniper Networks SRX-SFP-1GE-LX SFP Wired Transceiver Module for SRX 5000
Juniper Netscreen NS-ISG-1XG 10G for ISG-1000 ISG-2000 90   Free Ship
Juniper Netscreen NS-500-HG2-SX 2 port GBIC module
Juniper Netscreen ISG 2000 2-Port I/O Module GB2-TX NS-ISG-TX2
Juniper ISG-2000 Advanced Model NS-ISG-2000-DC 5.4.0r10.0 90  Warr Free Ship
Juniper FE-8_I/O 8 Port 10/100TX Rear Interface 90   
Juniper ES2-SRP-IOA E120 E320 BSR Switch Route Processor Input Output Adapter
Juniper ES2-GE8S1-IOA E320 half-height 8-port GE IOA 
Juniper ES2-10GES2-IOA 2 10-Gig Ethernet ports 1-active 1 standby E320 E120
Juniper ERX-GEFE256M-M​OD 1-port GE or 8-port 10/100 FE 90  Hardware  
Juniper ERX-8GEHDE-IOA Works with ERX-HDE-MOD line module 8 Port GE IOA
Juniper ERX-700 705 710 Edge Router SRP-5 90   
Juniper ERX-310 Router EX3-310DC1G-SY​S ERX-GEFE256M-M​OD 90  Free Ship