| 摘要 |
PURPOSE:To prevent attenuation of an analog signal, and also to select the most proper signal as a control signal by providing an analog signal mutual comparator, a logical circuit and plural relay driving circuits on a titled device. CONSTITUTION:Each analog input signal A, B and C is transferred to one side of contacts 19, 20 and 21, and comparators 10, 11 and 12, respectively. The comparator 10 compares a signal A and B, and transfers logic 1 as an output signal to logical circuits 13, 14, in case of exceeding a value set in advance. The comparator 11 and 12 also execute the same operation to the signal B and C, and the signal C and A. Each logical circuit 13-15 executes a logical operation, respectively, basing on each logical signal transferred from each comparator 10-12, and transfers an output signal to each relay driving circuit 16-18 and the logical circuits 14, 15, respectively. The logical circuits 13-15 decide a selecting order of the analog input signals A, B and C. Each relay driving circuit 16-18 drives a relay, respectively, basing on a signal transferred from each logical circuit 13-15, and opens and closes each contact 19-21. |
