| 摘要 |
PURPOSE:To realize a system having a self-checking function detecting quickly a failed part, by bringing the mode to the checking mode when an error of data transfer is detected to check the check data of input/output. CONSTITUTION:When a data transfer error is detected, a CPU32 supplies an error detecting signal to a data copy control circuit 40. If data transfer error is detected consecutively three times, the CPU32 applies an energizing command signal via an I/O port 27 to light an indicator light, and after a checking start signal is applied to the circuit 40, a light source control circuit 50 is set to the checking mode. In the check mode, CPUs 32, 49 execute checking with the switching of switches SW1, SW2 and when dissidence of the input/output check data is detected for communication LSI, the indicator light is turned on and off by indicator light energizing circuits 29, 44, allowing to detect quickly a failed part. |
