嗟乎!师道之不传也久矣!欲人之无惑也难矣!古之圣人,其出人也远矣,犹且从师而问焉;今之众人,其下圣人也亦远矣,而耻学于师。是故圣益圣,愚益愚。圣人之所以为圣,愚人之所以为愚,其皆出于此乎?爱其子,择师而教之;于其身也,则耻师焉,惑矣。彼童子之师,授之书而习其句读者,非吾所谓传其道解其惑者也。句读之不知,惑之不解,或师焉,或不焉,小学而大遗,吾未见其明也。巫医乐师百工之人,不耻相师。士大夫之族,曰师曰云者,则群聚而笑之。问之,则曰:“彼与彼年相若也,道相似也,位卑则足羞,官盛则近谀。”呜呼!师道之不复,可知矣。巫医乐师百工之人,君子不齿,今其智乃反不能及,其可怪也欤!
圣人无常师。孔子师郯子、苌弘、师襄、老聃。郯子之徒,其贤不及孔子。孔子曰:三人行,则必有我师。是故不必不如师,师不必贤于,闻道有先后,术业有专攻,如是而已。
李氏子蟠,年十七,好古文,六艺经传皆通习之,不拘于时,学于余。余嘉其能行古道,作《师说》以贻之。
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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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