Schneider Electric 170NEF11021 Communications Adapter

Schneider Electric 170NEF11021 is a Modbus Plus communication adaptor for the TSX Momentum/Modicon Momentum I/O family. It provides a single Modbus Plus port to connect a Momentum I/O base to a Modbus Plus network, enabling peer-to-peer and Master/Peer Cop style messaging across the fieldbus. Data are transmitted in the 984 data format, and the adaptor mounts on Momentum I/O bases to form a complete I/O module that participates in Modbus Plus communications. Physical dimensions are 178 mm in width and 216 mm in height, reflecting its integration with the Momentum sub-base form factor. This model was discontinued by Schneider Electric on March 15, 2022, with recommended replacements including Ethernet-based Momentum adapters 170ENT11001 and 170ENT11002 for newer network architectures, though aftermarket service and parts may continue through end of life. In typical distributed I/O applications, the 170NEF11021 enables a programmable controller to exchange inputs and outputs over a Modbus Plus network, supporting flexible, scalable automation layouts within legacy Momentum installations.