| 摘要 |
PURPOSE:To find a short-circuit fault point easily by dissociating and connecting slave stations at short distance from a master station by switching circuits while dissociating respective slave stations at long distance from the master station continuously, and performing the control of a control circuit in the event of a short-circuit fault. CONSTITUTION:If a short-circuit fault occurring to some part of a transmission line 7 disables information tansmission among all slave stations 8, (m) slave stations 8 are dissociated from the master station 5 at a time by pressing a switch; when another switch is further pressed in said state, the 1st switching circuit 91 is closed to connect the 1st closest slave station 81 to the master station 5. Then, the master station 5 sends a request signal. When the short-circuit fault point is not between the slave station with a slave number 1 and the master station 5, an answer is obtained. When there is no answer, it is found that the short-circuit fault point is between the (l)th switching circuit 9 and the (l-1)th circuit 9. |
