COMMUNICATION SYSTEM, METHOD OF SWITCHING COMMUNICATION LINK AND MASTER STATION DEVICE

摘要

An object of the present invention is to provide a communication system capable of reducing the possibility of switching errors of determining that a failure occurs to a currently used trunk communication line and switching the currently used trunk communication line to a backup communication line even when there is no failure in the currently used trunk communication line and capable of realizing a more appropriate line operation. The communication system according to the present invention is a communication system in which a combination of redundant configurations of communication lines and a power-saving-mode operating function is incorporated, and includes a power-saving-device identification unit that identifies a slave station device in a power saving mode, and a line switching unit that switches a communication line forming a communication route from the currently used communication line to the backup communication line when a state where a master station device does not receive a signal from any of a plurality of slave station devices except for the slave station device identified by the power-saving-device identification unit as being in the power saving mode among the slave station devices continues for a predetermined time.