| 摘要 |
PURPOSE:To prevent the malfunction due to a simultaneous falut, by supplying the two state signals which originally cannot have the same state. CONSTITUTION:The circuits 7 and 8 supply the output ''1'' when one side of the input is ''1'' with the other side of ''0'' respectively. As either one of the circuits 7 and 8 is always ''1'' with the other set under ''0'' in the normal state, the relay state can be taken in by having a decision with a correspondence secured between the existence of output of the circuit 7 and the operation of the relay as well as between the existence of output of the circuit 8 and the nonoperation of the relay respectively. The logic circuit 9 delivers an output when both inputs mentioned above are ''0''. The existence of output of the circuit 9 means that the same state has been secured for the two inputs which originally cannot have the same state. As a result, the occurrence of some fault is decided to block the logic decision to be given by the outputs of the circuits 7 and 8. In such way, the malfunction due to a simultaneous fault can be prevented. |
