| 摘要 |
PURPOSE:To detect the abnormality of a standby system transmission part before a main system is switched to the standby system and to improve the reliability of the system in terms of duplicated transmitters by returning a transmission signal from the standby system at a duplication switch part and permitting the standby system to receive said signal and to make a self diagnosis. CONSTITUTION:Where a changeover switch 11 complies with figure and where an A-system transmitter 1A and a B-system transmitter 1B are set to a normal system and a standby system, respectively, the transmission part 4B of the B-system transmitter 1B in the standby system is diagnosed. First a signal from a switch signal output part 6B energizes a relay 10B with the aid of a power source E, then a folding switch 9B is switched to the opposite side. When a checking signal is outputted from the transmission side 4B in that state, it is received by a reception part 5B. As a result the received checking signal can make a self-diagnosis. If the Bsystem transmitter 1B and the A-system transmitter IA are set to a normal one and a standby one, respectively, similarly relay 10A is energized to switch the folding switch 9A to the side opposite to figure. Therefore the transmission part 4A can make a self-diagnosis. |
