METHOD OF PROVIDING FUNCTIONAL SAFETY OF CENTRAL PROCESSOR MODULE OF INDUSTRIAL CONTROLLER AND MICROPROCESSOR SYSTEM FOR CARRYING OUT THIS METHOD (VARIANTS)

摘要

The invention relates to the architecture of a central processor module (hereinafter referred to as CPU module) of an industrial programmable logic controller and a method aiming at safe operation of such CPU module. The method focuses on the fact that the CPU module (2) uses a microprocessor system consisting of a central microprocessor (8) (hereinafter referred to as CM), an additional microprocessor (9) (hereinafter referred to as AM) and a safety microcontroller (10) (hereinafter referred to as SM). CM and AM perform the same tasks with the same input from sensors and transmit the results of processing these input data to the SM, which compares these results. The SM decides whether to permit the transfer of output data from CPU module to actuators, depending on the result of comparing the processed data from the CM and the AM, the result of monitoring of the task execution time in the CM and the AM performed by the SM, or the result of the SM software or hardware self-diagnostics. Hardware self-diagnostics of the SM is carried out using hardware mechanisms implemented on its chip.