| 摘要 |
PURPOSE:To reject chattering from a single contact signal without delay, by providing two FFs of R-S type in series connection of two stages. CONSTITUTION:The contact signal 3a having chattering is fed to the set input terminal of FF3 of the first R-S type, and the set output 3b of FF3 is fed to the set input terminal of the second FF4 of R-S type and the time limit element 5 in series connection of the inverters 5-1, 5-2 and 5-3. Further, the set output 4a of FF4 is the output signal of this circuit unit and fed to the reset input terminal via the time limit circuit 6 of the same constitution as the time limit element 5. Further, the reset output 4b of FF4 is fed to the reset input terminal of FF3. |
