Towards Formal Verification of IEC61499: modelling of Data and Algorithms in NCES

This paper aims to demonstrate the modelling details of IEC61499 basic function blocks by means of net condition event systems (NCES). In particular, the paper discusses modelling of basic data types, Boolean algebra and arithmetic operations of unsigned integer, and of simple algorithms in basic function block. The behaviour of the modelled IEC61499 systems can be verified by using model checking tools such as iMATCh and SESA.