The system and manner in order minimized the confusion of control, to take the synchronization of the redundant controller

摘要

(57) Abstract The primary process controller and when breaking down the system and the manner which in order to maintain the coherence of the data with the backup process controllers which are displaced in the said primary process controller run process control task are disclosed. The primary process controller runs process control task cyclically in period of the basic control cycle which possesses period T. The particular system (1) in the main memory of the primary process controller, in order the trace circuit which detects the data alteration and, (2) the data buffer and (3) the data alteration is accumulated primarily for transfer of the data alteration not to interfere to the run of process control task, at least 1 times, in the data buffer in period of each basic control cycle of the primary process controller, the data transfer circuit which is transferred to the backup memory of the backup memory controller and, it has the data alteration.