Patent ID: 8086898

Claim:
A redundant I/O module that communicates with a controller, by which plant equipment is controlled via either a control I/O module or a standby I/O module, comprising: the control I/O module that communicates with the controller includes a first IOM setting information holding section for storing IOM setting information downloaded from a high-level apparatus, and the standby I/O module that communicates with the controller includes a second IOM setting information holding section for storing IOM setting information downloaded from the high-level apparatus, wherein the controller comprises: an IOM status generation section that refers to a status of the first IOM setting information holding section of the control I/O module and a status of the second IOM setting information holding section of the standby I/O module; an IOM setting information acquisition section that makes an access to the first IOM setting information holding section of the control I/O module to acquire IOM setting information about the control I/O module when status information from the IOM status generation section indicates a status of replacement of the standby I/O module and a normal status of the control I/O module; an IOM setting information generation section that generates IOM setting information about the standby I/O module from the acquired IOM setting information about the control I/O module; and an IOM download section that downloads the generated IOM setting information into the second IOM setting information holding section of the standby I/O module.