Schneider Electric 140NOM21200 Modbus Plus Module

Schneider Electric's 140NOM21200 Modbus Plus Option Module is a Modbus Plus head-end interface for the Modicon Quantum automation platform. This Network Option Module (NOM) adds redundant Modbus Plus connectivity to a Quantum rack by providing two Modbus Plus RS485 twisted-pair ports, delivering a dual-media MB+ link for fault tolerance. As a DIO head-end adaptor, it bridges the Quantum CPU backplane to the Modbus Plus field network, enabling scalable expansion of distributed I/O and reliable interconnection with MB+ devices within a single system. The NOM21200 is documented as part of Schneider Electric's Modbus Plus Network Modules lineup and is designed to operate alongside other Quantum MB+ modules to support robust, modular control architectures. In the broader NOM family, there are fiber-optic variants such as 140NOM25200, reflecting Schneider's offerings for different physical media while preserving the same MB+ protocol connectivity.