JPS5616365A - Restart processing system - Google Patents

Abstract

PURPOSE:To realize a relief for the stored correspondence with the resending and without causing any mistake such as the errorneous distribution and the like, by using both the control information of the correspondence which is stored in the external memory device and the comparison information of the main memory device during the fault. CONSTITUTION:The control information of each correspondence in regions 11-1N on main memory device 5 are stored in regions 11'-1N' of external memory device 6 with a fixed distance and at the normal time. And the primary part among control information 11-1N is stored in regions 21-2N in the form of the comparison information at all times or when the fault occurs. In case the system has some fault, the control given from CPU4 is interrupted. Thus the correspondences in input 2 and output 3 are interrupted. Even in such abnormal state, the initial setting is possible by the stored 6 program or the fixed data. And furthermore, the control information in regions 11'-1N' of device 6 are pulled up to device 5 to be compared with the comparison information in regions 21-2N on device 5 and at the faulty point for checking. Thus the control information of the correspondence is extracted, and the states of the extracted control information are all set at the output starting time point of the correspondence. As a result, an automatic recovery of the system becomes possible.