| 摘要 |
PROBLEM TO BE SOLVED: To improve the work efficiency when a gas leak alarm 40 and a gas shutoff operating device 100 are installed. SOLUTION: The gas leak alarm 40 outputs a waiting signal of 6V in a standby state, and outputs a gas leak alarm signal of 12V when gas leak is detected. The gas leak alarm 40 is optionally connected to a terminal of a signal input circuit 13, and a lead switch 17a is turned on by a magnet 17b. ON of the lead switch 17a is detected, and a microcomputer 11 performs setting processing. By the setting processing, the voltage signal of each input port of an A/D conversion circuit 12 corresponding to each connecting terminal of the signal input circuit is scanned. The input port where 12 V or 6 V is detected is set (stored) as "there is connection". The input port where 0 V is detected is set as "there is no connection". The set information is stored in an EEPROM 18. By monitoring processing, the input port where 12 V or 6 V is detected is set as "there is connection". The setting processing is performed whenever the lead switch 17a is turned on. COPYRIGHT: (C)2009,JPO&INPIT
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