| 摘要 |
PURPOSE:To obtain an electronic lock function of a switch by giving a prescribed secret code disconnecting operating pattern to the switch in advance so that the next and succeeding operations are made effective for a prescribed time after the switch in matching with the pattern is disconnected. CONSTITUTION:When a switch S is turned off, a signal is generated to a point (1). This signal sets a timer T1. The signal from the switch S inputted within the set time of the timer T1 is stored in a counter C as the number of tims of operations. In the timing when the set time (0.5sec) of the timer T1 is elapsed and the timer is reset, a timer T2 is set and also the reset state of the timer T1 is inhibited so that an output signal of the switch S is not a count signal to the counter C. When the count value of the counter C is coincident with the number of times set as the predetermined secret code at the same time, an FF is set. Although the signal FF is reset after the time (1sec) of the timer T2 is elapsed, the signal FF acts like transmitting an output signal from the switch S to the exterior 7 as an effective signal only for one second when this signal FF is set. |
