The DLL provides basic time-critical data communications between devices in an automated environment. Type 21 provides priority-based cyclic and acyclic data communication using an internal collision-free, full-duplex dual-port Ethernet switch technology. For wide application in various automation applications, Type 21 does not restrict the cyclic/acyclic scheduling policy in the DLL.
IEC 61158-4-21-2010由国际电工委员会 IX-IEC 发布于 2010-08。
IEC 61158-4-21-2010 在中国标准分类中归属于: M11 通信网技术体制,在国际标准分类中归属于: 35.100.20 数据链路层,35.110 网络。
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