IEC 61158-6-2:2010 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. It specifies interactions between remote applications and defines the externally visible behavior provided by the Type 2 fieldbus application layer. 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:- update of normative and bibliographic references;- update of abbreviations;- update list of service request/response PDUs (Time Sync and Parameter ASEs/objects);- update of Time Sync ASE/object;- new Parameter ASE/object;- update/add object and services codes for Time Sync and Parameter ASEs;- new QoS specification.This bilingual version published in 2012-07 corresponds to the English version published in 2010-08.
IEC 61158-6-2:2014 defines the protocol provided to define the wire-representation of the service primitives defined in IEC 61158-5-2, and define the externally visible behavior associated with their transfer. This standard 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 cancels and replaces the second edition published in 2010 and constitutes a technical revision. The main changes are: - Updates of definition used by the Time Sync object; - Addition of "member" and object specific services in 4.1.2.1, 4.1.8, 4.1.10, 8.2; - Removal of obsolete transport classes 4 to 6 in 4.1.4.6, and 9.3.9 to 9.3.12; - Clarification of transport header formats in 4.1.4; - Update of CM and MR PDUs in 4.1.5 to 4.1.7; - Updates of Identity object PDUs in 4.1.8.2; - Updates of Assembly object PDUs in 4.1.8.4; - Updates of Time sync object PDUs in 4.1.8.6; - Updates of Parameter object PDUs in 4.1.8.7; - Updates of Connection Manager object PDUs in 4.1.8.8; - Updates of message and connection paths in 4.1.9; - Updates of object class codes in 4.1.10 and error codes in 4.1.11; - Updates of data types in 4.2.4 and 5.2.3; - Updates of the encapsulation abstract syntax in 4.3; - Updates to the DLL mapping protocol machine 2 in Clause 11.
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