Elevator communication controller and communication control method

A communications control system for elevators having a plurality of control units including at least respective car control units and elevator hall registration control units, each of the plurality of control units having a node, the plurality of nodes being connected to each other via a network, and each of the nodes having a management table establishing correspondence between a node number and a network address, the communications control system comprising:

• a node acting as a master when a first network address corresponding to the node number of the node is, upon referring to the management table, a specific address in the management table, and sending to all other nodes a broadcast communication to notify that the node is a temporary master having the first network address added and receiving from a second temporary master at a second node a broadcast communication notifying that the second node is a temporary master having a second network address corresponding to the node number of the second temporary master added, if the first network address and the second network address conform to specific conditions;
• and
• a node acting as a slave when the network address corresponding to the node number of the node is not a specific address in the management table, and when the first network address corresponding to the node number is a specific address in the management table, upon referring to the management table, the node sends to all other nodes a broadcast communication to notify that the node is a temporary master having the first network address added and receives from another temporary master a broadcast communication notifying that the other node is a temporary master having a second network address corresponding to the node number of the other temporary master added, if the first network address and the second network address do not conform to specific conditions.