标准摘要
[中文适用范围]： IEC 61158 的这一部分规定了现场总线组件的要求。它还规定了必要的媒体和网络配置要求，以确保 a) 数据链路层错误检查之前的数据完整性； b) 物理层设备之间的互操作性。现场总线物理层符合 ISO 7498 定义的 OSI 7 层模型的第 1 层，但对于某些类型，帧定界符位于物理层，而对于其他类型，帧定界符位于数据链路层。 [外文原描述]： IEC 61158-2:2010 specifies the requirements for fieldbus component parts. It also specifies the media and network configuration requirements necessary to ensure agreed levels of: a) data integrity before data-link layer error checking; b) interoperability between devices at the physical layer. The fieldbus physical layer conforms to layer 1 of the OSI 7-layer model as defined by ISO 7498 with the exception that, for some types, frame delimiters are in the physical layer while for other types they are in the data-link layer. This fifth edition cancels and replaces the fourth edition published in 2007 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - for Type 18, Table 157 reduced tolerance to 5 %; - for Type 18, in 32.5.3.1 removed minimum cable length; - for Type 18, in 32.5.4. and R.2.2 cable reference removed; - for Type 18, Table 160 and 161 terminating resistor value changed to 680 Ω. This bilingual version published in 2011-12, corresponds to the English version published in 2010-07.
英文名称Industrial communication networks - Fieldbus specifications - Part 2: Physical layer specification and service definition