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To serve the demand for fuzzy-control components in automation systems, manufacturers extend the functionblock libraries of their multi-loop and PLC-software by respective function-blocks. Other demands are for the openness of PLC-software and its adaptation to the IEC 1131 standard [I], which, for the first time, gives recommendations with respect to a task-model and taskcommunication. The unique idea of the PE4RL-PLC is to use an adequate high-level real-time language for PLC-software design and implementation [I51 facilitating all mentioned user demands in a totally open form. Definition and verification of fuzzy components are described in the paper and further advantages of the use of high-level real-time languages in PLCs with respect to safety-critical aspects are mentioned.

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