Schneider Electric 140NOM21100 DIO Head-End Adaptor

Schneider Electric's 140NOM21100 DIO head-end adaptor is a Modicon Quantum module designed to interface a digital I/O network with Quantum PLC systems, providing a dedicated head-end connection for DIO devices within the Modicon Quantum architecture. It is documented on Schneider Electric's official product pages as “DIO head-end adaptor Modicon Quantum - 1 Modbus+RS485 twisted pair single copper,” confirming that it uses a single Modbus+ RS485 twisted-pair channel over copper. The adaptor’s role as a DIO head-end interface is reflected in the product title and description on Schneider Electric’s site. Regional notices indicate this reference is being phased out in many markets; for example, the US site marks it as “Discontinued on: Dec 31, 2022,” while European pages show end-of-commercialization statements with an end-of-service date of December 31, 2030. For engineers planning a retrofit or upgrade, Schneider Electric also lists a replacement path in some datasheets, noting that 140NOM21100 is replaced by an Ethernet module BMENOC0301 within the Modicon Quantum ecosystem.