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如何選擇和開(kāi)發(fā)DeviceNet系統

作者: 時(shí)間:2016-12-16 來(lái)源:網(wǎng)絡(luò ) 收藏
DeviceNet構建于CAN總線(xiàn)的基礎之上,使用CAN總線(xiàn)11位標識區,只使用標準幀。11位標識區中,5位用于表示報文類(lèi)型(32種報文),另外6位表示總線(xiàn)地址(64個(gè)地址)。
DeviceNet是一個(gè)簡(jiǎn)單的網(wǎng)絡(luò )化解決方案,降低了成本及安裝設備和配線(xiàn)的時(shí)間,并提供良好的互換性,使得多家供貨商的產(chǎn)品可以像組件一樣可以互換。DeviceNet是一個(gè)開(kāi)放的網(wǎng)絡(luò )標準。其規范和協(xié)議都是開(kāi)放的。供貨商不必購買(mǎi)硬件,軟件,或許可權限,就可以把設備接入一個(gè)DeviceNet系統。其規范文本可以從Open DeviceNet Vendor Association Inc.( ODVA)獲得。
DeviceNet在達成眾多復雜設備之間的互操作性的同時(shí),也允許簡(jiǎn)單設備之間的互換性。DeviceNet通訊連接基于廣播的通訊協(xié)議,即CAN協(xié)議。1996年,CAN芯片的出貨量超過(guò)10million片。主要的一些CAN芯片的供貨商有Intel, Motorola, Phillips and Hitachi.
DeviceNet的出現有兩個(gè)目的:
傳送與現場(chǎng)級設備相關(guān)的控制信息.
傳送其它與系統控制間接相關(guān)的信息,比如配置信息(Configuration).

DeviceNet的特點(diǎn)
下表列出了DeviceNet主要的物理媒介層特性:
總線(xiàn)類(lèi)型CSMA/BA, master-to-slave, explicit and solicited messaging. Unsolicited messaging, multiple masters, and peer-to-peer was introduced in early 1996 by the Systems SIG group of the ODVA for approval, conformance review and implementation in 1996 and 1997.
節點(diǎn)總數64
總線(xiàn)拓撲帶分支線(xiàn)的線(xiàn)性網(wǎng)絡(luò )
通訊距離500 meters full trunk line, 6 meter branches @ 125 kbps
250 meters full trunk line, 6 meter branches @ 250 kbps
100 meters full trunk line, 6 meter branches @ 500 kbps
156 meters accumulative distance of the branches @ 125 kbps
78 meters accumulative distance of the branches @ 250 kbps
39 meters accumulative distance of the branches @ 500 kbps
傳輸媒介Full trunk line - 2 wire twisted shielded cable with 2 wire bus power
cable and drain wire.Thin trunk line - same as full above but with lesser wire size which is more economical and easier to install.
傳輸信號Square wave digital with NRZ (Non Return to Zero) encoding
輸入點(diǎn)數64 bits (allocated in bytes) standard in polling mode, larger fragmented messages are supported.
輸出點(diǎn)數64 bits (allocated in bytes) standard in polling mode 24 bits in explicit messaging. Fragmented messages are also supported.
通訊速率125 kbps, 250 kbps, 500 kbps
總線(xiàn)電源8 Amp full trunk line, 4 Amp thin line
重復地址偵測Yes, nodes announce address on start-up and all listen. If a duplicate address is heard, the duplicate node will not advance to run mode.
從站檢測Yes, a list is programmed in the interface and checked
錯誤偵測Yes, CRC
錯誤糾正Yes, nodes that detect errors signal the sender to repeat.
地址設定Off line via hand held programmer or with a dedicated interface and host.本文來(lái)自織夢(mèng)
On line via the interface master using a reserved newcomer default address that is changed to an application address. Dip/rotary switches are optional.
節點(diǎn)參數編程Can be very extensive to include drive/rotational and instrument parameters
歷史The early days of DeviceNet were essentially Allen-Bradley. In 1992, Allen-Bradley started to share information and invite not only strategic partners, but direct competitors to become DeviceNet members. DeviceNet was released at the ICEE show in Chicago, March 1994. Then, a year later,本文來(lái)自織夢(mèng)
Allen-Bradley turned DeviceNet over to ODVA, Open DeviceNet Vendors Association.

基于DeviceNet的網(wǎng)絡(luò )架構



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