Facility management system

A facility management system comprising:

• a plurality of processing facilities;
• a plurality of signal lamps that indicate information on the plurality of processing facilities, respectively;
• a plurality of information acquisition devices that are attached to the plurality of signal lamps, respectively, that acquire light emission information on the plurality of signal lamps, respectively, and that wirelessly transmit the light emission information;
• and
• a management device that wirelessly receives the light emission information which is transmitted by each of the plurality of information acquisition devices and that manages a state of the corresponding processing facility on the basis of the light emission information, wherein:
• each of the plurality of information acquisition devices includes a sensor that acquires the light emission information and a controller that controls the sensor;
• the controller executes an acquisition process of acquiring the light emission information using the sensor, a transmission process of wirelessly transmitting the light emission information executed after the acquisition process, and a hibernation process of bringing the controller into a hibernation state corresponding to a power-saving mode executed in a period from the transmission process to the next acquisition process;
• and
• a time of the hibernation process is a variable time set in accordance with a hibernation random number.