| 摘要 |
PURPOSE:To prevent undue entering a room in the time zone outside the specified and enhance the security by ordering the last outgoing person to push a push-button switch, and changing over the incoming person management with cards into the mechanical system security. CONSTITUTION:Entering a specific area can be made by allowing a card reader to read the set card until the last outgoing person pushes a switch 5 at the time of going out. Once he pushes the switch 5, a flip-flop 10 is set, and the set output becomes '1'. Thereby the output 14 of an inverter 13 becomes '0', and the output of an AND gate 9 becomes '0'. That is, no unlock signal is generated, and an electric lock remains locked. A signal input circuit 17 and a signal processing circuit 18 leading to sensors S1-Sn are put in function with the PF 10 set, and the condition of mechanical security is generated. If any intruder, etc., is sensed, a division 20 in charge of security is informed about it. A contact 22 is opened through the action of a solenoid, and current feed to a specific electric apparatus in the specific area is shut off forcedly, which takes place despite eventual operator's forgetting the turning-off of the switch. |
