COMMUNICATIONS CONTROL SYSTEM FOR ELEVATORS USING SYNCHRONIZED COMMUNICATION IN A MASTER-SLAVE NETWORK

摘要

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 mutually connected via a network as a single master and a plurality of slaves, and each node having a management table establishing correspondence between a node number and a network address, wherein
the master sends a first synchronization start data to a first slave among a plurality of slaves; upon receiving synchronization completion data from a previous slave sends subsequent synchronization start data to a subsequent slave in sequence; upon receiving the synchronization completion data from a last slave from among the plurality of slaves completes one cycle of synchronization communication, and also, measures the one cycle of the synchronization communication as a synchronization communication cycle time, and measures a duration between the sending of the synchronization start data to each slave as a synchronization communication node allocated time, thus managing the communication; and
wherein each slave upon receiving the synchronization start data from the master sends data to another node; and upon completing the sending of the data sends synchronization completion data to the master.