Abstract: A computer implemented method for converting an input computer program into an output computer program having a target global accuracy discloses, including: receiving a target internal accuracy for each mathematical function included in the input computer program, analyzing the input computer program to determine a dependency graph describing dependencies between mathematical functions calls, the mathematical functions being processed according to the dependency graph by, for each processed mathematical function: using a value range determination tool to produce a value range for the processed mathematical function based on each synthesized mathematical function obtained for a mathematical function on which the processed mathematical function depends according to the dependency graph, using a synthesis tool to produce a synthesized mathematical function having the target internal accuracy, the output computer program being generated by replacing each mathematical function call by a call to its corresponding s

Abstract: The present invention is related to a method for checking correctness of a PLC program described by functional specifications typically presented as a timing chart. The method comprises: —S1: translating the PLC program into a model, —S2: translating the timing chart and integrating said timing chart into the model, —S3: computing abstract semantics, to infer information eventually missing in the timing chart, —S4: predicating transformation, and deducing properties to be verified, from the model and from predefined PLC formalized instructions, in order to satisfy timing chart verification, —S5: solving and checking whether said properties are always verified, or providing counter-examples, —S6: translating said counter-examples into PLC model errors events initial configurations, —S7: simulating execution, —S8: assembling states and events executions variables values, and —S9: translating back to PLC program.