Design patterns for Failure Management in IEC 61499 Function Blocks.

IEC 61499 standard has promised to help handling the high level of complexity of modern control systems, but it hasn\´t still been adopted by the industry. Several authors claim for design methodologies to guide control engineers using this standard. This paper shows a way to ease the development of IEC 61499 based applications identifying and characterizing "extended FBs", adding semantic artefacts to basic FBs. Specific design patterns are built from those extended FBs, which match elements of the problem domain. Two specific design patterns are presented which allow dealing with Failure Management, a common topic in control applications.