ABNORMALITY SUPERVISORY METHOD UTILIZING LIGHTING LINE BY BIDIRECTIONAL COMMUNICATION

摘要

PURPOSE:To attain proper and instant bidirectional communication by starting the sending of an invaded abnormal signal of each slave equipment after a specific delay time elapses and making all slave equipments in standby when a slave equipment sending the invaded abnormality at first is started so as to prevent signal collision. CONSTITUTION:A specific delay time is set to the slave equipments 5a-5n, the sending of an invaded abnormal signal to each slave equipment is started after the specific delay time elapses, the standby state of all the other slave equipments is formed by the transmission of the slave equipment detecting at first the invaded abnormality, said standby state is released after the end of reception of the invaded abnormal signal sent at first from the master equipment 4 and the sending of the invaded abnormal signal of the other slave equipment is started. While the invasion abnormal signal is sent from the slave equipment to the master equipment, the polling from the master equipment to the slave equipment is suppressed and the sending of the invaded abnormal signal from the slave equipment to the master equipment is suppressed during said polling. Thus, disadvantages in lack of the instantaneous performance of the calling and in generation of signal interference is solved.