METHOD OF ENSURING THE FUNCTIONAL SAFETY OF THE MODULE OF THE CENTRAL PROCESSOR OF THE INDUSTRIAL CONTROLLER AND MICROPROCESSOR SYSTEM FOR THE IMPLEMENTATION OF THIS METHOD

摘要

The invention relates to the architecture of the CPU module (hereinafter referred to as the CPU module) of an industrial programmable logic controller and a method oriented towards the safe operation of the CPU module. The method consists in the fact that the CPU module (2) uses a microprocessor system consisting of a central microprocessor (8) (hereinafter CM), an additional microprocessor (9) (hereinafter DM) and a security microcontroller (10) (MB). CM and DM perform the same tasks with the same input data from the sensors and transfer the results of processing these input data to the MB, which compares these results. MB decides whether to allow output from the CPU module to the actuators depending on the result of comparing the results of processing from the CM and the DM, or on the result of the MB monitoring the execution time of the task in the CM and DM, or on the result of software or hardware self-diagnostics MB . Hardware self-diagnosis of MB is carried out using hardware mechanisms implemented on its chip.