| 摘要 |
PURPOSE:To count a pulse without causing bit-over even in case when the whole moving distance of a moving body is changed and the number of output pulses is increased, by counting a pulse train supplied from an external apparatus such as a rotary encoder, etc., after driving it by a desired frequency dividing ratio. CONSTITUTION:In case when ''3'' is set to a signal supplied to input terminals B1-B3 of a comparator 35, if a moving body exists in a reference position, a reference position signal of an ''L'' level is supplied to a terminal 17, and counters 30, 20 are reset. Subsequently, when the moving body moves to the positive side, an up-pulse UP is outputted from an up-down pulse extracting circuit 1, and is supplied to a UC terminal of the counter 30. The counter 30 executes up- counting whenever the up-pulse UP is supplied. When the third up-pulse UP is supplied to the counter 30, output terminals SIGMA1, SIGMA2 of a total adder 35 become an ''H'' level, SIGMA3 becomes an ''L'' level, and a signal supplied to input terminals A1-A3 of the comparator 35 coincides with a signal supplied to the input terminals B1-B3. The operation for outputting an up-signal S1 once whenever the up-pulse UP is outputted three times is repeated. |
