General The data-link layer provides basic time-critical messaging communications between devices in an automation environment. This protocol provides a highly-optimized means of interchanging fixed-length input/output data and variable-length segmented messages between a single master device and a set of slave devices interconnected in a loop (ring) topology. The exchange of input/output data is totally synchronous by configuration@ and is unaffected by the messaging traffic. Devices are addressed implicitly by their position on the loop. The determination of the number@ identity and characteristics of each device can be configured@ or can be detected automatically at start-up.
61158-4-8-2007由IEC - International Electrotechnical Commission 发布于 2007-12-01,并于 2007-12-18 实施。
* 在 61158-4-8-2007 发布之后有更新,请注意新发布标准的变化。
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