Duplex system and method of switching control right in duplex system

Abstract

A duplex system has a control station which has a pair of input/output modules duplicated on control and standby sides, which is disposed between a higher-level device and a lower-level device, and which sends and receives data. The duplex system further has a module information storing section which stores information of the pair of input/output modules provided in the control station, a module information displaying section which displays information stored in the module information storing section, a selecting section which selects at least one pair out of input/output modules displayed on the module information displaying section, and a switching section which switches a control right of the pair of input/output modules selected by the selecting section from the control side to the standby side.

Dependencies are inferred from the claim text.