IEC 61158-6-3:2014

IEC 61158-6-3:2010 defines in an abstract way the externally visible behaviour provided by the Type 3 fieldbus application layer. It specifies the protocol provided to: define the wire-representation of the service primitives specified in IEC 61158-5-3, and define the externally visible behaviour associated with their transfer. It specifies the protocol of the Type 3 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 second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes with respect to the previous edition are: - corrections, in Table 10 and Table 48; - clarification in 6.9.1.2; - expired patents deleted and new patents disclosed. This bilingual version published in 2012-07 corresponds to the English version published in 2010-08.

IEC 61158-6-3:2019 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 fourth edition includes the following significant technical changes with respect to the previous edition: - corrected substitutions in Table 4; - corrections in 5.3.14; - corrections in 5.5.6; - corrections in 5.17.15; - corrections in 5.17.16.2; - spelling and grammar.