IEC 61784 3-2:2010 specifies a safety communication layer (services and protocol) based on CPF 2 of IEC 61784-1, IEC 61784-2 and IEC 61158 Type 2. It identifies the principles for functional safety communications defined in IEC 61784-3 that are relevant for this safety communication layer. It defines mechanisms for the transmission of safety-relevant messages among participants within a distributed network using fieldbus technology in accordance with the requirements of IEC 61508 series for functional safety. These mechanisms may be used in various industrial applications such as process control, manufacturing automation and machinery. This second edition cancels and replaces the first edition published in 2007. It constitutes a technical revision. The main changes with respect to the previous edition are:- updates in relation with changes in IEC 61784-3;- addition or modification of the following subclauses to support the Extended Format: 6.3.2.1, 6.3.3.4, 6.3.11, 6.6.7.5, 6.8.5.13, 6.8.5.14, 7.1.1, 7.5.5, 7.6.10.10, 7.6.10.12, 8.2, 8.10.2.4.4, 9.5.2;- modification of all pseudo code in 7.5 to support Extended Format;- addition of Attribute 15 in 6.7.3.1;- addition of subclauses 8.11, 8.12 and 8.13 to clarify requirements for CP 2/2, CP 2/3 and CP 16/3 respectively. This bilingual version published in 2011-11, corresponds to the English version published in 2010-07.
IEC 61784 3-2:2016 specifies a safety communication layer (services and protocol) based on CPF 2 of IEC 61784-1, IEC 61784-2 and IEC 61158 Type 2. It identifies the principles for functional safety communications defined in IEC 61784-3 that are relevant for this safety communication layer. This safety communication layer is intended for implementation in safety devices only. This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. The main changes with respect to the previous edition are listed below (and highlighted in yellow in this document): - Added detailed requirements for use of FSCP 2/1 in conjunction with CP 16/3 (see 4.1, 6.4.3, 6.5.3, 8.2, 8.13, and miscellaneous references when referencing CPF 2 networks); - Defined object class section keywords for safety to EDS file definition in 8.10.2.1; - New sections on safety CRC overview in 7.1.2.1 and Rollover counts for EF format in 7.4; - Corrections to PFH calculations in 9.5.2; - Change from MACID to NodeID as general reference to network identifier.
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