Shared memory duplex system
专利汇可以提供Shared memory duplex system专利检索，专利查询，专利分析的服务。并且PURPOSE: To change over the control to a subsystem at the time of the failure of a main system without providing a system auditing device, etc., by writing the data, in which the main system is periodically updated, into a shared memory, reading periodically this by a subsystem and inspecting the updating.
CONSTITUTION: A main system 1 writes a data value updated each time without fail, for example, a timer value, into the prescribed area of a shared memory periodically. A subsystem 2 reads the data at the interval of the period longer than the period written by the main system 1, and the data are read and the updating is inspected. Since the data are read at the period longer than the writing period of the main system 1, it is natural that when the writing of the main system 1 is normal, the reading data are different from the previous reading data without fail. When the data value of the same contents is continuously read, it is decided that the data are stopped due to the occurrence of a hardware defect or the data are hung up due to the software defect, and therefore, the data cannot be updated to a condition information area periodically.
COPYRIGHT: (C)1987,JPO&Japio，下面是Shared memory duplex system专利的具体信息内容。
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