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The Schneider 140NOM21100C DIO Head-End Adaptor manages distributed I/O communication for Quantum systems. This adaptor connects remote I/O drops to the main controller. You will find it in large-scale automation projects with geographically distributed equipment. It supports up to 32 remote drops on a single network segment. Therefore, this unit reduces field wiring costs and simplifies system expansion.
The Schneider 140NOM21100C DIO Head-End Adaptor measures 140 mm in height and 40 mm in width. Its depth reaches 120 mm for standard Quantum rack mounting. The unit weighs approximately 0.42 kilograms. It contains one 32-bit processor and two network ports. Six status LEDs provide network and diagnostic information. Additionally, you get one 9-pin D-sub connector for bus connection.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Schneider Electric |
| Model | 140NOM21100C |
| Product Type | DIO Head-End Adaptor |
| Network Protocol | Modbus Plus (1 Mbps) |
| Network Ports | 2 (9-pin D-sub, female) |
| Maximum Remote Drops | 32 per segment |
| Cable Length | 450 meters (maximum) |
| Processor | 32-bit @ 50 MHz |
| Memory | 256 KB (buffer) |
| Height | 140 mm |
| Width | 40 mm |
| Depth | 120 mm |
| Weight | 0.42 kg |
| Status LEDs | 6 (PWR, RUN, TX, RX) |
| Energy Storage | ≈ 280 µF (capacitive) |
| Power Consumption | 300 mA @ 5 VDC |
| Isolation Rating | 1500 VAC (optical) |
| Operating Temperature | 0°C to +60°C |
| Mounting Method | Quantum rack |
| Configuration | Software only |
Internal Architecture and Energy Storage
The Schneider 140NOM21100C DIO Head-End Adaptor stores minimal energy in its power filter. Small electrolytic capacitors hold approximately 280 microfarads total capacitance. A 32-bit processor runs the Modbus Plus protocol stack at high speed. This processor handles all token-passing and data routing functions. Two network ports allow daisy-chaining of multiple remote drops on one segment. Six optical isolators protect the backplane from network transients. The module includes 256 KB of buffer memory for data storage. Six LEDs show power, run, transmit, and receive status clearly. A green RUN LED lights up when the adaptor communicates with the CPU normally.
Connection Interfaces and Wiring Details
You will find two 9-pin D-sub female connectors on the front panel. Connect the Modbus Plus cable to Port 1 for network access. Use Port 2 to daisy-chain to the next drop on the bus. The Schneider 140NOM21100C DIO Head-End Adaptor requires proper termination at both network ends. Connect the A wire to pin 4 and the B wire to pin 5. Connect the shield drain wire to pin 1 (ground). Use shielded twisted-pair cable for all network connections. Six LEDs indicate power, run, transmit, and receive status. A green TX LED flashes during message transmission from this adaptor. A green RX LED flashes during message reception from remote drops.
Configuration and Installation Steps
You slide this adaptor into any I/O slot of the Quantum rack. First, align the module with the upper and lower card guides. Then, push it firmly until the backplane connector seats completely. Secure the front panel with the two retaining screws. Connect the Modbus Plus cable to the network ports. The Schneider 140NOM21100C DIO Head-End Adaptor consumes 300 mA from the backplane supply. Use the Concept or Unity Pro software to configure network parameters. Assign a unique station address from 1 to 64 using the software. Set the communication parameters including baud rate (1 Mbps fixed). Map each remote drop to specific I/O addresses in the configuration. Download the configuration to the adaptor’s internal memory. Test communication with all remote drops before system startup.