Industrial communication networks – Fieldbus specifications – Part 5-21: Application layer service definition – Type 21 elements

Title		Industrial communication networks – Fieldbus specifications – Part 5-21: Application layer service definition – Type 21 elements
Acronym		IEC 61158-5-21
Document Type		Standard
Committee		TC 65/SC 65C - INDUSTRIAL NETWORKS
Published Year		2019
Link		https://webstore.iec.ch/publication/64840
Abstract IEC 61158-5-21:2019 specifies the structure and services of the type 21 IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application Layer Structure (ISO/IEC 9545). This second edition cancels and replaces the first edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: •added Write and Read service; •miscellaneous editorial corrections.