| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a production facility control system allowing an operator to recognize an instruction for controlling power of a production facility. <P>SOLUTION: A production facility control system 100 comprises a facility control section 120, a broadcast apparatus 130 and an information collecting device 140. The facility control section 120 and the broadcasting apparatus 130 transmit a sound wave which is generated while periodically changing signal levels of a specific frequency in a band range of audible sound at a frequency lower than a specific frequency. The information collecting device 140 receives the sound wave and selectively extracts a signal level of the specific frequency. When a change in the received signal level of the extracted specific frequency corresponds to a periodic changes of the signal level transmitted by the facility control section 120, control-target facilities 150 and 160 are placed under power control or operation control based on a result of analyzing a frequency component of the specific frequency. <P>COPYRIGHT: (C)2012,JPO&INPIT |
