When argumenting the safety of an industrial system, the validity of the calculation of the residual error rate depends on multiple factors. Examples are a correct and thorough analysis of hazards, a correct estimation of occurrence and on the risk the identified hazards pose. These properties of the analysis have then to be compiled into a sound error model that reflects reality, and can then be used as basis for calculating the residual error rate of the system. One error model for industrial communication networks is given in IEC 61784-3 [1, B.3]. In this paper, this commonly used error model for industrial communication networks is analyzed and its shortcomings are pin-pointed, leading to the question, whether the current model should be scrutinized, not only its parameters. Based on this analysis a new approach on an error model is proposed. This new model has the advantages of more accurately modelling burst errors, and using input parameters that give less reason for discussion as they are widely used in electro magnetic compatibility (EMC) tests for hardware.
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