Patent ID: 9372744
Filing Date: 2016-06-21
CPC Classification: G06F,H04L,H04Q

Claim Text:
1. A method for detecting a failure in a control/monitoring signal transmission system in which a master station is connected with a plurality of slave stations via a common data signal line, and transmission of data is performed according to a transmission synchronization scheme, the method comprising: acquiring, by the slave station, input information from an input part corresponding to a first slave station as well as acquiring control data from a transmission signal, the control data being referred by the first slave station and being for an output part of the second slave station, the output part being in a correspondence relation with the input part, the transmission signal being transmitted via the common data signal line and including a management data region different from a control/monitoring data region comprising data of a control data signal and data of a monitoring data signal; obtaining, by the slave station, a pseudo output change timing equal to a true output change timing of the output part based on the control data; comparing, by the slave station, a time difference between the pseudo output change timing and an input change timing of the input part with a first threshold value and a second threshold value; determining, by the slave station, a normal state when the time difference is larger than the first threshold value and smaller than the second threshold value, a first failure state when the time difference is smaller than the first threshold value, and a second failure state when the time difference is larger than the second threshold value; and causing, by the slave station, a signal configuring data indicating the first failure state or the second failure state to be superimposed on the management data region.