总线类型 | 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. |
节点总数 | 64 |
总线拓扑 | 带分支线的线性网络 |
通讯距离 | 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 |
传输媒介 | 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. |
传输信号 | Square wave digital with NRZ (Non Return to Zero) encoding |
输入点数 | 64 bits (allocated in bytes) standard in polling mode, larger fragmented messages are supported. |
输出点数 | 64 bits (allocated in bytes) standard in polling mode 24 bits in explicit messaging. Fragmented messages are also supported. |
通讯速率 | 125 kbps, 250 kbps, 500 kbps |
总线电源 | 8 Amp full trunk line, 4 Amp thin line |
重复地址侦测 | 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. |
从站检测 | Yes, a list is programmed in the interface and checked |
错误侦测 | Yes, CRC |
错误纠正 | Yes, nodes that detect errors signal the sender to repeat. |
地址设定 | Off line via hand held programmer or with a dedicated interface and host. 本文来自织梦 On line via the interface master using a reserved newcomer default address that is changed to an application address. Dip/rotary switches are optional. |
节点参数编程 | Can be very extensive to include drive/rotational and instrument parameters |
历史 | 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, 本文来自织梦 Allen-Bradley turned DeviceNet over to ODVA, Open DeviceNet Vendors Association. |
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