| 摘要 |
PURPOSE:To automatically attain the internal diagnosis of a function module having an error by providing a separate exclusive bus in addition to a common bus for a management module, coupling the function module to the exclusive bus so as to control the management module. CONSTITUTION:In detecting the occurrence of an error via an exclusive bus control circuit 6 by the management module 3, the content of error of a module 1, e.g., having an error via the exclusive bus 8 is read through an exclusive bus port 4, and if the content of error gives effect on a microprocessor or a common bus 11, the exclusive bus 8 is used to start the internal diagnosis of the function module 1. In such a case, the function module is transferred to the diagnostic mode to prevent the other function modules from being affected due to the fault and diagnosis. In detecting the production of error of the function module via an exclusive bus control circuit 6 by the management module 3, the function module is brought into the diagnostic mode from the exclusive bus port 4 via the bus 8 to apply the fault diagnosis. |
