Overview
The 140NOM21200 is a Schneider Modicon Quantum DIO head-end adaptor, order code 140NOM21200, handling 30 input and 32 output words over a single Modbus RS232 twisted-pair port and two Modbus Plus RS485 twisted-pair ports at 1 Mbit/s. It draws 4.0 W, mounts on a chassis, and carries UL 508 and California Proposition 65 compliance marks.
This module acts as a DIO head-end adaptor for the Modicon Quantum platform, bridging remote I/O drops to the controller over Modbus Plus at 1 Mbit/s. The 30 input and 32 output words define the I/O capacity it can map — enough for medium-density distributed racks with discrete and analog signals. The single Modbus RS232 port handles point-to-point programming or connection to legacy serial devices, while the two Modbus Plus RS485 ports support redundant twisted-pair cabling for fault-tolerant fieldbus networks. The checks field (RAM Processor RAM address Checksum) indicates the module performs internal memory integrity verification on startup.
Applications
Modicon Quantum DIO head-end adaptors like the 140NOM21200 are used in process and hybrid automation — oil and gas skids, water treatment plants, power generation balance-of-plant, and material handling systems — where remote I/O racks are distributed across a plant floor and communicate over Modbus Plus to a central Quantum controller.