| 摘要 |
PROBLEM TO BE SOLVED: To achieve connection failure monitoring of a control line of an optical warning device at low costs in a warning system for performing optical warning in addition to acoustic warning.SOLUTION: A control device is connected to a warning line pulled out of a receiving device, and an acoustic warning line in which a plurality of bells each for issuing a warning by using sounds are connected in parallel and an optical warning line in which a plurality of optical warning devices each for issuing a warning by using rays of light are connected in parallel are pulled out of the control device. In the control device, the warning line is connected to the acoustic warning line, and the optical warning line is made independent of the pertinent line. The control device includes: a detection part for detecting a line failure which occurs in the optical warning line; and a failure warning transfer part for outputting the occurrence of the line failure to the warning line in accordance with the detection result. The receiving device detects the line failure which has occurred in the acoustic warning line and the line failure which has occurred in the optical warning line via the warning line, and when receiving disaster detection information, switches polarity setting of a voltage of the warning line from a state that the line failure is detected to at least a state that the bell is rung. |
