METHOD AND SYSTEM FOR IMPLEMENTING REDUNDANT NETWORK INTERFACE MODULES IN A DISTRIBUTED I/O SYSTEM

摘要

A method and system is disclosed for implementing redundant master NIMs (202 204) on a single bus (106) in an industrial distributed I/O system (200) for controlling selected I/O modules (110 112 114). According to aspects of the invention two master NIMs (202 204) interoperate on a single bus (106) with one being the primary active master (202) and the second master (204) in a secondary standby mode ready to assume mastership of the system if the primary master (202) is no longer active.