| 摘要 |
PURPOSE:To automatically detect the generation of a latent fault and obtain a fundamental data for deciding an abnormal place, by deriving a fault generation factor based on all the number of times of operation, from the common equipment or the common control equipment. CONSTITUTION:In a crossbar automatic switchboard, the display information N of number of times of operation, and the information E of number of times of faulty operation (BTR) are led into the scanning circuit 1 from the markers CM0-CMn2. The operation control part 3 starts the circuit 1 periodically, extracts a data as to how many times one of the markers 2 has been operated, and how many times the BTR operation among them has been executed, and registers it in the memory device 4 in accordance with the marker number. Among the markers 2, that which has attained to the prescribed number of times of operation calculates the BTR operation factor E/N at that time, compares it with the reference BTR operation factor which is registered in advance in the device 4, decides it as normal in case of K>E/N, returns to zero the values of N and E which have been counted before, and starts to count once again. In case of E/N>K, it is decided that a fault has been caused, and it is displayed on the display part 5. |
