DIN EN 61158-6-21-2013 工业通讯网络.现场总线规范.第6-21部分:应用层协议规范.21型元件 (IEC 61158-6-21-2010).英文版本EN 61158-6-21-2012, 仅为CD-ROM
Industrial communication networks - Fieldbus specifications - Part 6-21: Application layer protocol specification - Type 21 elements (IEC 61158-6-21:2010); English version EN 61158-6-21:2012, only on CD-ROM
This standard is one of a series produced to facilitate the interconnection of automation system components. It is related to other standards in the set as defined by the three-layer fieldbus reference model described in IEC/TR 61158-1:2010.
This standard contains material specific to the Type 21 communication protocol.