| 摘要 |
In a fault-tolerant system which is constructed from two identical control devices, there is a requirement to establish consistent memory contents in both devices in order to guarantee uninterrupted operation in the event of a hardware defect in one of the two control devices. To this end, the memory contents are transferred from an active control device to an inactive control device. In this situation, the active control device remains in operation and the contents of the memory of the active control device can be continually updated. According to the invention, the transfer of the memory contents is performed by a copying device, whereby the copying device manages the memory areas of the memory of the active control device which are to be transferred and which are possibly changing by means of a memory monitoring module and a marking memory.
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