| 摘要 |
PURPOSE:To increase the reliability of selector through the increase in the possibility of selection, by transmitting the instruction of selection memorized and calculated in the main station to the slave station, when the sub-main station receives the failure information from the slave station. CONSTITUTION:Slave stations S1...S5 detect failure in the transmission line T and the failure in the station itself, the sub-main stations SM1...SM3 receive the failure information from some slave stations memorize MEM and deliver C the instruction of selection controlling the selector switch SW depending on the information, and the main station M calculates COM the instruction of selection and delivers the result to the sub-main stations SM1...SM3. Further, when the sub-main station SM1...SM3 receive the failure information from t slave stations S1...S5, the instruction of selection calculated COM and memorized MEM in the main station is delivered to the slave stations S1...S5. Thus, the possibility of selection is increased and the reliability as the selector can be increased. |
