Anywire Corporation

Mitsubishi Electric Corporation

Kuroda Precision Industries Ltd.

Nke Co., Ltd.

Kazuo Itani

Kenji Nishikido

Youichi Hoshi

Yuji Watanabe

Yoshitane Saito

Mitsuhiro Tsunoo

Hidemi Yamazaki

Shigeru Hiroi

Takeharu Katsuno

A management data area including a plurality of pulsed signals is provided in a series of pulsed signals outputted from the main station to the common data signal line, the area being different from a control/monitoring data area including data of a control data signal and data of a monitoring data signal. The substation sets random number data generated by its own station as an original number, generates pieces of comparison/collation data having a plurality of bits based on the original number, and superimposes a signal including the pieces of comparison/collation data on the management data area. The main station determines existence of address overlap of the substations based on a result of comparing the pieces of comparison/collation data complying with a predetermined rule.

Transmission line address overlap detection system and substation terminal used in the system

A control/monitor signal transmission system that employs a transmission synchronization scheme in which a master station connected to a single control unit and a plurality of slave stations corresponding to a plurality of controlled apparatuses synchronize with each other through a transmission clock and data is transmitted therebetween over a common data signal line, a transmission line disconnection detection method that enables a disconnection of a transmission line to be detected precisely; and a slave station that is used for this method. A continuous pulse signal that the master station outputs to the common data signal line is provided with a management data region that includes a plurality of pulse signals and that differs from a control/monitor data region including data of a control data signal and data of a monitor data signal.

Transmission line disconnection detection method and slave station used for the method

A control/supervisory signal transmission/reception system includes a central station and a number of local stations which are interconnected by a common data line carrying a three-level voltage signal so as to transfer data signals between the central and local stations. Information concerning structures and functions of the local stations is grasped automatically by using frames having ID codes differing from one to another frame, whereby the central station can check occurrence of breakage of the transmission line or shut-down of the local station inclusive of the units to be controlled/supervised associated with the local station. The frame includes a start signal field, a data signal field, a local station ID code field and an end signal field. In the local station, an ID code allocated thereto and a count value indicating data reception/transmission address are preset. When coincidence is detected between the ID code sent from the central station and the ID code preset in the local station, the local station generates an end response. The frames sent out sequentially contain ID codes having values varying sequentially so as to identify the local stations, respectively. When no end response is detected, the central station can decide malfunction of the data signal line or units to be controlled/supervised of the local stations discriminatively on the basis of the ID codes.

Control/supervisory signal transmission/reception system

Growing community of inventors

Nagaokakyo, Japan

Kazuo Itani