Product Overview
When a Modicon Quantum rack needs a dependable bridge between field I/O and the controller, the Schneider Electric 140NOM21100C DIO head-end adaptor does the job without drama. It is a standard-format module from the Modicon Quantum automation platform, built to handle distributed input and output communication over Modbus RS-485 and Modbus RS-232 twisted-pair copper links. If you are keeping a Quantum system running and want a practical, ready-to-ship spare, this adaptor deserves a close look.
Technical Specifications That Matter
Dual Modbus Interfaces at 1 Mbps
The 140NOM21100C carries one Modbus Plus RS-485 port and one Modbus RS-232 port, each on single twisted-pair copper. A 1 Mbps transmission rate keeps data exchange brisk, which matters when scan time affects throughput.
I/O Word Capacity
The module supports 30 input and 32 output words, giving engineers enough headroom for mixed digital and analog data exchange across the rack.
Electrical Load
Power dissipation is 4 W, and the module draws 780 mA from the bus. Plan your power budget accordingly before adding it to a loaded backplane.
Environmental Durability
Operation is rated from 0 to 60 °C, with 95 % relative humidity without condensation. The conformal coating (Humiseal 1A33) adds protection in demanding plant environments. Electrostatic discharge resistance is rated at 4 kV contact and 8 kV on air. The unit operates at altitudes up to 5000 m.
Where It Fits in Your System
The 140NOM21100C is compatible with 140CRA21110 and 140CRA21120 modules, making it a natural fit when you are matching head-end adaptors to existing remote I/O drops. Typical deployments include oil and gas process skids, water treatment control rooms, and legacy manufacturing lines still running Quantum racks. In each case, the goal is the same: keep Modbus traffic moving reliably between the controller and field devices.
Integration Note
Wiring into Modbus networks may require an external gateway or connection module. Confirm cables and gateways with your supplier before commissioning.
Selection and Maintenance Advice
Before ordering, verify your rack revision, confirm the 140CRA21110 or 140CRA21120 compatibility, and check that your power budget covers 780 mA and 4 W. Inspect the module periodically for dust buildup and secure connections, and follow the manufacturer’s safety manual for all service work. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Why Source It From Oil AutoTech
Oil AutoTech specializes in fast-dispatch spares for oil, gas, and industrial automation. When a Quantum rack is down, you need the right part, not a long lead time. Our team offers hands-on technical selection help to confirm the 140NOM21100C matches your application. Contact Oil AutoTech today for pricing and availability.
