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canopen协议

更新时间:2019-08-25 11:08:27 大小:3M 上传用户:sun2152查看TA发布的资源 标签:canopen 下载积分:1分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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Fieldbus networks from the OSI network model point-of-view usually only have the layers 1(Physi-

cal Layer),2(Datalink Layer) and 7(ApplicationLayer) implemented. The intermediate layers are not needed because a fieldbus network usually con-sists of a single network segment only(no need for Transport and Network Layer, layer 3 and 4) and has no notion of ' sessions'(layer 5) or a need for different internal data' presentation'(layer 6).

The CAN(Controller Area Network) fieldbus de-fines only the layers I and 2(ISO11898); in prac-tice these are completely handled by the CAN hardware, significantly reducing the implementa-tion effort for developers of the fieldbus node firmware.


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