This Part of IEC 61804 is applicable to Function Blocks (FB) for process control and specifies the Electronic Device Description Language (EDDL).
This standard specifies FB by using the result of harmonization work as regards several elements.
a) The device model which defines the components of an IEC 61804-2 conformant device.
b) Conceptual specifications of FBs for measurement, actuation and processing. This includes general rules for the essential features to support control, whilst avoiding details which stop innovation as well as specialization for different industrial sectors.
c) The Electronic Device Description (EDD) technology, which enables the integration of real product details using the tools of the engineering life cycle.
This standard defines a subset of the requirements of IEC 61804-1 (hereafter referred to as Part 1) only, while Part 1 describes requirements for a distributed system.
The conformance statement in Annex B, which covers the conformance declaration, is related to this standard only. Requirements of Part 1 are not part of these conformance declarations.
The standardization work for FB was carried out by harmonizing the description of concepts of existing technologies. It results in an abstract level that allowed the definition of the common features in a unique way. This abstract vision is called here the conceptual FB specification and mapped to specific communication systems and their accompanying definitions by the industrial groups. This standard is also based on the abstract definitions of IEC/PAS 61499-1.
NOTE This standard can be mapped to ISO 15745-1.
The EDDL is ready for use and fills the gap between the conceptual FB specification and a product implementation. It allows the manufacturers to use the same description method for devices based on different technologies and platforms. Figure 1 shows these aspects.
There are solutions on the market today, which fulfil the requirements of this standard and show how the conceptual specification is implemented in a given technology. New technologies will need to find equivalent solutions (see Figure 4).
BS EN 61804-2:2004 history
2010BS EN 61804-2:2010 Function blocks (FB) for process control. Specification of FB concept and electronic device description language (EDDL)
2010BS EN 61804-2:2007 Function blocks (FB) for process control - Specification of FB concept and electronic device description language (EDDL)
2004BS EN 61804-2:2004 Function blocks (FB) for process control - Specification of FB concept and electronic device description language (EDDL)