| 摘要 |
A logical system provided with a logical circuit using at least one logical element, in which the logical element performs a first logical function in response to a first control binary information and a second logical function in response to a second control binary information. Input pair signals (1,0) and (0,1) which are successive binary signal elements different from each other are applied to the logical circuit as input signals while control binary information is applied to the logical element so as to alternately perform the first logical function and the second logical function. Faults of the logical element can be detected by detecting at the output of the logical circuit a fault pair signal (1,1) or (0,0) which are successive signal elements of the same binary information.
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