| 摘要 |
PURPOSE:To prevent system down by performing switching control of the output from a receiving system through a fault detecting circuit for each system at an ATC receiving section. CONSTITUTION:When receiving sections 3-1, 3-2 are normal, fault detecting relays CHR1, CHR2 are turned ON and outputs fi1, fi2 from the interface frequency generating sections 32, 32 in the receiving sections 3-1, 3-2 are transmitted, respectively, to control sections 4-1, 4-2. Upon fault of the receiving section 3-1, the fault detecting relay CHR1 is turned OFF to interrupt the signal fi1 from the control section 3-1 and the signals fi2 are transmitted to both control sections 4-1, 4-2. In similar manner, signals fi1 are transmitted from the receiving section 3-1 to the control sections 4-1, 4-2 upon fault of the receiving section 3-2. |
