IEC 61499 is an international standard that prescribes the use of function blocks for designing industrialprocess control systems. Function blocks enable control software to be developed using an intuitive standard's-based graphical framework. The standard, however, lacks the semantic rigour necessary for automated verification of function block programs. Several approaches to fill this lacuna have been proposed, but these have so far focused on the verification of control properties by

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... ing data from the program. This letter builds on a recent proposal to translate function blocks to Esterel in order to use the verification tools for Esterel to verify both control and data properties of function block programs. The key extensions to this translation are described herein, and have been implemented in a prototype tool. The viability of this approach is illustrated through several examples using this prototype. This demonstrates how a language with rigorous semantics and associated tools, like Esterel, can be advantageously combined with graphical notations familiar to industrial engineers to produce reliable control software.