Schneider Electric 140NOM21100 Network Interface Module

Schneider Electric’s 140NOM21100 is a 1‑channel Modicon Quantum Network Option Module (NOM) that provides a Modbus Plus head‑end interface over a single twisted‑pair RS‑485 connection. This DIO head‑end adaptor connects a Quantum controller to a Modbus Plus network, enabling communication with distributed I/O over copper twisted‑pair cabling. In 2023 Schneider Electric regional notices, the 140NOM21100 was discontinued in several markets, with the noted replacements directing users toward BMENOC0301 (Modicon M580 Ethernet) for newer systems. The replacement BMENOC0301 represents the shift from Modbus Plus head‑end connectivity to Ethernet‑based networking within the Modicon M580 family, while the 140NOM21100 is historically described as a Modbus Plus head‑end interface, single medium, twisted pair cable, within the Quantum network architecture.