| 摘要 |
PURPOSE:To know a source of information easily in case of a fault by allowing the 1st data processor to fetch prescribed data in communication data transmitted through a highway at a high speed, and selecting only necessary information and recording it with an added data. CONSTITUTION:A CPU2 when finishing receiving one highway word obtained by converting data flowing through a communication cable HWY from serial to parallel adds specific mask data to this highway word and sends a bus-use request signal REQ2 to a CPU3 when the data is desired data. When an acknowledge signal ACK is obtained, the CPU2 stores the data in a buffer memory 4. The CPU3 checks whether the data is stored in the memory 4 or not after initialization, and stores the data in a buffer memory 5 together with data on the day and time when so. |
