The present invention relates to a CANopen-based IEEE 1451 smart sensor system and a method of operating the multi-access, and includes: a plurality of TIM modules performing an interface with a transducer, signal conversion, and signal processing, and acting as slaves in a CANopen network; One NCAP module performing a function of transmitting a command to the TIM module and of transmitting data received from the TIM module in digital form through a higher network, and acting as a master in a CANopen network; And TII using CANopen for an interface between the NCAP module and the TIM module. It provides a CANopen-based IEEE 1451 smart sensor system capable of multiple access, comprising a. According to the present invention, since the CANopen protocol is used as the physical layer, up to 127 TIMs can be multiplexed to one NCAP, and a defect of the TIM module in a smart sensor is realized by implementing a plug-and-play function using a node guarding protocol. If this occurs, by replacing only the TIM module without redesign or replacement of the network program, the intelligence of the automation system can be improved.
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