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CANopen/AS-Interface网关标准发布

时间:2006-12-01 阅读2487次

 

 

本文英文版转自CiA网站:http://www.canopen.org/news/?2006-11-21-3
中文版由远方翻译,版权归DND网站所有,请勿转载。

Standardized CANopen/AS-Interface gateway

CAN in Automation (CiA) has released the CiA 446 specification. It describes the standardized CANopen/AS-Interface gateway. The gateway provides NMT slave
functionality on the CANopen side; NMT master functionality may be implemented additionally. On the AS-Interface side up to two AS-Interface masters may be connected per logical device. Theoretically, up to eight logical devices may be implemented in a single CANopen device. The gateway specification supports M0 to M4 AS-Interface master functions.
In the document 132 Transmit-PDOs and 132 Receive-PDOs are described to communicate digital and analog input/output signals from the two AS-Interface sub-systems. All AS-Interface parameters may be configured by means of SDO write services to the CANopen object dictionary of the gateway. By means of SDO read services it is possible to get the status of any AS-Interface slave device.

“In the past, the communication with CANopen sub-layered AS-Interface systems was manufacturer-specific,” said CiA’s Olga Fischer, who is responsible for this gateway specification. “The standardized CiA 446 CANopen interface profile enables at least a partial re-use of application software in the programmable CANopen control system, if gateway devices are interchanged.” The companies Bihl & Wiedemann, ifm electronic, and Schneider Electric participated actively in the standardization of the CiA 446 interface profile.


CANopen/AS-Interface网关标准发布
CAN in Automation (CiA)发布了CiA 446标准,此份规格描述了CANopen与AS-Interface两种总线的网关的标准。该网关标准在CANopen一侧提供NMT从站功能,也可能附加NMT主站功能,在AS-Interface一侧,每个逻辑设备可以连接两个AS-Interface主站。理论上,一个CANopen设备可以集成到最多8个逻辑设备。网关协议支持M0到M4 AS-Interface主站功能。

在文档中,描述了132个发送PDO和132个接收PDO,用于与两个AS-Interface子网上的数字IO和模拟量IO进行通讯。所有的AS-Interface参数,都可以通过CANopen的SDO写服务(Write service),对网关的对象词典进行写操作来进行配置。同理,SDO读服务也可以获取任何AS-Interface的从站状态。

“过去,CANopen与AS-Interface子层的通讯,都是制造商自己定义的,”来自CiA的Olga Fischer说,他负责这个网关协议的制定。“如果网关设备可以互换,那么CiA 446协议的接口规范,至少能使一部分可编程CANopen控制系统的应用软件重新使用。” Bihl & Wiedemann, ifm electronic, 和Schneider Electric等公司都积极参与到CiA 446 接口规范中来。

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