描述
1756-RM2
PLC历史简述:
60年代以前,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。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,并提出了著名的十项招标指标,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。
产品承诺:
保 证 全新原装进口,
保 证 安全准时发货,
保 证售后服务质量,
优势价格,大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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SYMBOL MOTOROLA ML-2499-FHPA9-01R ANT:2.4 GHZ,FIXED DP,
SYMBOL MOTOROLA 90500116-R SPARE MOUNTING BRACKET W/HRD
SYMBOL MOTOROLA AN720-L51NF00WUS ANT: RFID,RUGGED,US FR
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SYMBOL MOTOROLA LS4208-SBZU0100SR KIT:LS4208 BLK, USB A
SYMBOL MOTOROLA LS4208-SWZU0100SR KIT:LS4208 WHT, USB A
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SYMBOL MOTOROLA LS1203-7HDU0100SR KIT:LS1203:TWL BLK,HD
SYMBOL MOTOROLA LS2208-SR20371R LS2208: ISBT-128 CONCAT
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SYMBOL MOTOROLA ML-2452-LAK1-01R LIGHTNING ARRSTR: DUAL
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SYMBOL MOTOROLA LS2208-1AZU0300SR USB KIT:POWER PLUS CB
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Lot of 4 Motorola Symbol WS5100RS Wireless Switch
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SYMBOL MOTOROLA ML-2499-7PNA2-01R ANT:2.4GHZ,7DBI,INDOO
SYMBOL MOTOROLA CR0078-SC1009BWR CRADLE, BLUETOOTH, CHA
SYMBOL MOTOROLA LS2208-1AZKT100SR KBW KIT: STAND,ADAPTE
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Motorola/symbol 2a Ls9208-sr10171nswr Ls9208
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SYMBOL MOTOROLA STB4278-C0001WR CRD:CHGR,MULTIFACE/BT C
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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
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