在60年代，汽车生产流水线的自动控制系统基本上都是由继电器控制装置构成的。当时汽车的每一次改型都直接导致继电器控制装置的重新设计和安装。随着生产的发展，汽车型号更新的周期愈来愈短，这样，继电器控制装置就需要经常地重新设计和安装，十分费时，费工，费料，甚至阻碍了更新周期的缩短。为了改变这一现状，美国通用汽车公司在1969年公开招标，要求用新的控制装置取代继电器控制装置，并提出了十项招标指标，即：
(1）编程方便，现场可修改程序；
(2）维修方便，采用模块化结构；
(3）可靠性高于继电器控制装置；
(4）体积小于继电器控制装置；
(5）数据可直接送入管理计算机；
(6）成本可与继电器控制装置竞争；
(7）输入可以是交流115V；
(8）输出为交流115V，2A以上，能直接驱动电磁阀，接触器等；
(9）在扩展时，原系统只要很小变更；
(10）用户程序存储器容量至少能扩展到4K。
如果您发现其他供货商为相同产品提供更为低廉的价格，
我们也愿意参照其价格向您提供进一步的折扣。只要您诚心购买，
如果还有其他任何问题，请随时与我们联系。
我们的使命是帮助你：
降低维护成本!
我们有大量库存的控制系统部件。 我们还有许多新的硬件和停产备件，以帮助支持你现有的控制系统。
您或许会在我们的资料中找到您需要的备品备件，在任何时间，我们都欢迎您对我们产品提出宝贵的建议。
福州卓凯电子科技有限公司
联系人：林工
24小时咨询热线：
TEL：
QQ：879520885
传真：
公司地址：福州市闽侯西江滨大道77号正荣润园一号楼1205室
产品价格以电话或者QQ询价为准，发布价格及图片不做参考
DELL 0NH278 POWEREDGE 2950 G1 SYSTEM BOARD 4GB RAM 2* INTEL XEON 3000DP/4M/667
DELL 17" LCD MONITOR P/N E177FPT W/ OPTIPLEX 755 WIN 7 E2160 1.80GHZ 2GB RAM Q35
DELL 7000805-0000 SERVER MOTHERBOARD/MAINBOARD REFURB!!
DELL CONSTELLATION ES.2 3TB 3.5" INTERNAL HARD DRIVE ST33000650SS 9SM260-150
DELL CONSTELLATION ES.2 3TB 7200RPM SAS HARD DRIVE HDD 9SM260-150 ST33000650SS
DELL E190SB 19" TFT ACTIVE MATRIX FLAT PANEL LCD MONITOR
DELL E2214HB 21.5" MONITOR 1920X1080 REVA02
DELL EQUALLOGIC PS6000 LED ID SWITCH CONSOLE MODULE XYRATEX 68045-01
DELL GIGABIT ETHERNET ADAPTER QUAD PORT 00D1998 FRU47C8210
DELL HC3 SCALE R630 SERVER 16GB 2* 6-CORE E5-2620 V3 8* 1.8TB 10K RF9T8
DELL INSPIRON 24 3000 E2-7110 ALL-IN-ONE PC 3455 23.8 4GB 500GB HDD WIN 10 CY44X
Dell Laptop Briefcase, Black Leather, Fits Up to 16", With Shoulder Strap
Dell Laptop Briefcase, Black Nylon, 18"
DELL MELLANOX CONNECT X-3 56GB MEZZANINE CARD FOR M630 8PTD1 REV D1 CX380A
DELL NAS CLOUD ARRAY SYSTEM BOARD DA0S29MB8E0 REV E
DELL OPTIPLEX 760 W/ 17" MONITOR & STAND CORE 2 DUO E7500 @ 2.9GHZ 1708FPT
DELL OPTIPLEX 960 DESKPTOP W/ DELL 19" MONITOR AND DELL MULTIMEDIA SPEAKER AX510
Dell Padded Laptop Briefcase, Black Nylon, Fits Up to 15.6"
DELL POWERCONNECT 2808 8-PORT SWITCH C752K
DELL POWERCONNECT 3448 48 PORT FAST ETHERNET SWITCH
DELL POWERCONNECT 6248 48-PORT GIGABIT ETHERNET LAYER 3 SWITCH AS-IS SALE
DELL POWEREDGE 1950 SERVER W/ XEON E5405 QUAD CORE QC 2GHZ CPU 4GB DDR2 5300
DELL POWEREDGE 2950 2*QUAD CORE QC 2.33GHZ 2*73GB 15K / AS IS
DELL POWEREDGE 2950 6*73GB 15K HARD DRIVES 16GB DDR 5300 RAM 2* E5345 2.33GHZ
DELL POWEREDGE 2950 RACKMOUNT SERVER WITH 2 * XEON E5450 3.00GHZ 16GB RAM
DELL POWEREDGE FS12-TY XEON L5630 2.13GHZ 8GB DUAL PSU 7GF4X
DELL POWEREDGE M610 MOTHERBOARD 0N582M REV A05A
DELL POWEREDGE OEM R720 SERVER E5-2640 SIX CORE 2.5GHZ 128GB DDR3 2*300GB H310
DELL POWEREDGE R310 SERVER XEON X3440 QC 2.53GHZ 8GB 2*1TB 2*500GB
DELL POWEREDGE R415 SERVER OPTERON 4334 6-CORE 8GB 2*1TB 2*500GB +INTENSITY PRO
DELL POWEREDGE R610 1U RACK SERVER 2.27GHZ QC CPU 12GB DDR3 RAM 2* 73GB 10K SAS
DELL POWEREDGE R610 SERVER 2* XEON E5530 QC 2.40GHZ 12* 8GB DDR3 6* 146GB HDD
DELL POWEREDGE R610 SERVER QC XEON E5540 2.53GHZ 8GB DDR3 RAM DVD-ROM
DELL POWEREDGE R610 SERVER W/ 2 * INTEL XEON X5660 2.80GHZ CPU 24GB DDR3 ECC
DELL POWEREDGE R730XD SERVER 12* 4TB HARD DRIVES 48TB XEON 6 CORE E5-2609V3 32GB
DELL POWEREDGE R810 128GB RAM 4*E7540 6-CORE XEON 6* 600GB 2.5" 10K SAS DUAL PSU
DELL POWEREDGE R810 SERVER 2U 2* 2.00GHZ 10 CORE PROCESSORS 64GB DDR3 1067MHZ
DELL POWEREDGE R900 SERVER 4 * E7320 2.13GHZ 5 * 73GB 15K SAS 96GB RAM
DELL POWEREDGE R905 RACK SERVER 2 * AMD OPTERON 2.0GHZ 8GB RAM 3* 146GB 15K
DELL POWEREDGE T110 II COMPACT TOWER SERVER 8GB DDR3 XEON SR0PH 3.10GHZ CPU
DELL POWEREDGE T710 SERVER W/ 2* 6 CORE 2.40GHZ E5645 3* 2TB SAS 16GB RAM
DELL POWERVAULT MD 14-BAY STORAGE ARRAY W/ 2* AMP01-SIM CONTROLLERS / ENCLOSURE
DELL POWERVAULT MD STORAGE ARRAY W/ 13 * 146GB 15K SAS DRIVES DUAL CONTROLLERS
DELL POWERVAULT NX400 SERVER WITH DVD DRIVE + 4* 1TB 7.2K SAS HDDS 8GB RAM E5-24
DELL POWERVAULT TL2000 AUTOMATED TAPE LIBRARY W/LTO ULTRIUM 3 DRIVE
DELL POWERVAULT TL2000 LTO LIBRARY 2U W/OUT TAPE DRIVE + 0NN037 NN037 RAILS
DELL SLIM LINE POWER SUPPLY FOR OPTIPLEX 790 03WN11 H240AS-00
