Elevator network for emergency operation

An emergency operation controller for an elevator, the controller connected to other emergency operation controllers of their respective elevators through network, each controller constituting a node in the network,

• wherein the controller generates and transmits an emergency condition detection message to other controllers in the network which constitute adjacent nodes to the controller when the controller detects an emergency condition, and receives an emergency condition detection message from other controllers which constitute adjacent nodes to the controller in the network when other controllers detect an emergency condition,
• wherein the emergency condition detection message includes a propagation count, the propagation count configured to be decremented by one, each time one controller transmits the emergency condition detection message to other controllers which constitute next adjacent nodes, and the emergency condition detection message is continuously transmitted until the propagation count reaches to zero, and
• wherein each emergency operation controller is configured to perform an emergency operation based on a received emergency condition detection message, if the controller receives the emergency condition detection message prior to the detection of the emergency condition.