| 摘要 |
PURPOSE:To simplify the structure of the preset switch by providing the coincidence circuit which detects the coincidence of the count value between the counting counter and the preset counter. CONSTITUTION:Counting counter circuits 11-14 are provided to count the count input supplied, along with preset counter circuits 81-84 which count the signals of preset switches 100-104 and then memorize and hold the count value. Furthermore, the following component parts are added: transfer gate switches 51-54 which switch the count value of circuts 11-14; transfer gate switches 71-74 which switch the count value of circuits 81-84; and display units 31-34 which display the switched count value of switches 51-54 plus 71-74 respectively. Then coincidence circuit 122 detects the coincidence of the count value between counter circuits 11- 14 and 81-84, and the preset output is delivered from circuit 122. In case no power is supplied to circuits 81-84, the power is supplied from battery 121 to avoid the malfunction. |
