予少以进士游京师2,因得尽交当世之贤豪。然犹以谓国家臣一四海3,休兵革,养息天下以无事者四十年4,而智谋雄伟非常之士,无所用其能者,往往伏而不出;山林屠贩5,必有老死而世莫见者,欲从而求之不可得。
其后得吾亡友石曼卿。曼卿为人,廓然有大志6,时人不能用其材,曼卿亦不屈以求合;无所放其意,则往往从布衣野老7,酣嬉淋漓8,颠倒而不厌。予疑所谓优而不见者,庶几狎而得之9,故尝喜从曼卿游,欲因以阴求天下奇士10。
浮屠秘演者11,与曼卿交最久,亦能遗外世俗,以气节自高12。二人欢然无所间13。曼卿隐于酒,秘演隐于浮屠,皆奇男子也,然喜为诗歌以自误。当其极饮大醉,歌吟笑呼,以适天下之乐,何其壮也!一时贤士,皆愿从其游,予亦时至其室。十年之间,秘演北渡河14,东之济、郓15,无所合,困而归。曼卿已死,秘演亦老病。嗟夫!二人者,予乃见其盛衰,则予亦将老矣。
夫曼卿诗辞清绝16,尤称秘演之作,以为雅健有诗人之意。秘演状貌雄杰,其胸中浩然17,既习于佛无所闻;独其诗可行于世,而懒不自惜,已老,肤其橐18,尚得三、四百篇,皆可喜者。曼卿死,秘演漠然无所向。闻东南多山水,其巅崖崛峍19,江涛汹涌,甚可壮也,遂欲往游焉,足以知其老而志在也。于其将行,为叙其诗,因道其盛时以悲其衰。庆历二年十二月二十八日庐陵欧阳修序。
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1746-NI4
欧姆龙
Revolution Pi是基于树莓派(Raspberry Pi)开发的工业计算机,在定制的印刷电路板上集成了相关的接口,集开放性、模块化和经济性于一身。可以作为工业物联网的网关,解决自动化产线上的数据采集、传输与应用的问题,实现不同现场间的数据交换,是智能生产中不可或缺的环节,仿佛是为工业4.0而生的产品,自带“主角光环“
“小身材”里的“大智慧” 继电器尺寸的工业计算机
Revolution Pi的显著特点之一是结构紧凑,产品宽度仅为22.5mm,采用了BCM2837处理器,4核芯片,处理速度可达1.2 GHz,运行环境温度范围为-40℃~+55℃,工作电压范围10.7VDC~28.8VDC,从技术参数上看,是一款非常优秀的工业计算机,能够完全适应严苛的工业环境的要求。
角色转换无压力 从工业计算机到普通PLC
Revolution Pi支持多种软件,集成的背板母线可以轻松地扩展I/O模块以及多种通讯接口模块,使用CoDeSys工具进行编程并下载,可以使得Revolution Pi瞬间转变为一台中型的PLC,在实现本地I/O控制的同时,实现分散式I/O控制。Revolution Pi支持多种第三方通讯协议(例如Profinet, Ethernet/IP, EtherCAT, Modbus/TCP等)并可以作为通讯的Master,与第三方远程I/O站点模块也可完美兼容,集开放性、便利性和经济性于一体。
Revolution Pi不但拥有强大的计算能力,也可以处理简单的运动控制功能和图形化可视功能,也就是说通过CoDeSys工具,可以使得Revolution Pi同时涵盖标准控制、运动控制以及图形化可视功能。由于她本质上是一台工业计算机,因此相比传统的PLC,性能上要更胜一筹,除了能完成相关的控制功能外还能实现控制数据的本地存储以及外部/云端的访问。
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