EN IEC 61158-6-4:2019

Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer protocol specification - Type 4 elements EN IEC 61158-6-4:2019

Publication date:   Nov 14, 2019

General information

60.60 Standard published   Aug 23, 2019


CLC/TC 65X Industrial-process measurement, control and automation

European Norm

25.040.40   Industrial process measurement and control | 35.100.70   Application layer | 35.110   Networking



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IEC 61158-6-4:2019 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 2 fieldbus. The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life.

This International Standard specifies interactions between remote applications and defines the externally visible behavior provided by the Type 2 fieldbus application layer. The purpose of this document is to define the protocol provided to

a) define the wire-representation of the service primitives defined in this document, and

b) define the externally visible behavior associated with their transfer. This document specifies the protocol of the Type 2 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545).

This third edition includes the following significant technical changes with respect to the previous edition:

a) additional user parameters to services;

b) additional services to support distributed objects;

c) additional secure services.

Life cycle


EN 61158-6-4:2014


EN IEC 61158-6-4:2019
60.60 Standard published
Aug 23, 2019


EN IEC 61158-6-4:2023