Patent ID: 6450298
Filing Date: 2002-09-17
Classification: B66B

Abstract:
A communications control system for elevators having a plurality of control units including respective car control units and elevator hall registration control units, each of said plurality of control units having a node, the plurality of nodes being connected to each other via a network, and each of said nodes having a management table establishing correspondence between a node number and a network address, said elevator communications control system comprising:a node acting as a master and, when a first network address corresponding to the node number of this node is, upon referring to the management table, a specific address in the management table, sending to all other nodes a broadcast communication to notify that this node is a temporary master and having the first network address added thereto, and receiving from another temporary master a broadcast communication for notifying that this other node is a temporary master having a second network address with the node number of this other temporary master added thereto, if the first network address and the second network address conform to specific conditions; and a node acting as a slave and, when the network address corresponding to the node number of this node is not a specific address in the management table or the first network address corresponding to the node number of this node is a specific address in the management table, upon referring to the management table, sending to all other nodes a broadcast communication to notify that this node is a temporary master having the first network address added thereto and receiving from another temporary master a broadcast communication for notifying that this other node is the temporary master having a second network address corresponding to the node number of this other temporary master added thereto, if the first network address and the second network address do not conform to specific conditions, wherein said node acting as the master sends synchronization start data to one slave from among a plurality of slaves; receives synchronization completion data from the slave to send subsequent synchronization start data to a subsequent slave, in order; and adjusts the timing for sending synchronization start data so that it matches a target cycle, assuming that an interval for sending the synchronization start data is a synchronization start data sending cycle, based on: an amount of time from the sending of the synchronization start data until the receiving of the synchronization completion data; an amount of time required for sending the data, being calculable from a number of sending data stored in a sending buffer until the time of sending; and a target time for the synchronization start data sending cycle.