| 摘要 |
PURPOSE:To prevent the erroneous counting by synchronizing the four signals of command pulse signals of A-phase signal, B-phase signal, normal rotation command pulse signal and reverse command pulse signal of a pulse generator with the four signals displaced in the phases. CONSTITUTION:An input pulse from a normal command input terminal 1 is synchronized by a rise detector 3 with phi1 synchronizing signal 5. An input pulse from the reverse command input terminal 2 is synchronized with phi3 synchronizing signal by a rise detector 4. A rise detector 17 outputs a signal synchronized with phi4 synchronizing signal 8 to an AND circuit 19, and a fall detector 18 outputs a signal synchronized with phi2 synchronizing signal 6 to an AND circuit 20. Since the phi1-phi4 synchronizing signals are displaced in the phases, the signals are not inputted to the counter 11 simultaneously or in superposed manner, and are not erroneously counted. |
