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Home > Electrical & Electronics > Electrical Control System > SCHNEIDER 140NOM21100 Electric I/O Module

SCHNEIDER 140NOM21100 Electric I/O Module

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

1Yr

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guizhou

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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Operating Temperature -25℃-70℃

Relative Humidity 5%-95% (non-condensing)

Dimensions 483mm×177mm×120mm

I. Overview

Schneider 140NOM21100 is a Modbus Plus communication module. As the core component for the system to access the Modbus Plus industrial bus, it undertakes the data interaction task between the Quantum PLC, devices on the same bus, upper-level monitoring systems, and distributed I/O.

Adopting an industrial-grade bus communication architecture, this module is highly compatible with the backplane bus protocol of the Quantum system, enabling efficient data flow between the control layer and the monitoring layer. It is a key device for building centralized communication networks in medium-to-large industrial automation scenarios.

In industrial scenarios, the 140NOM21100 is widely used in distributed control networks in fields such as metallurgy, electric power, and chemical engineering, thanks to its stable bus communication capability. For example, in the steel rolling production line of a steel plant, multiple Quantum PLCs access the Modbus Plus bus through this module to realize real-time sharing of parameters such as rolling mill speed and steel plate thickness. In the tank farm monitoring of a chemical park, the module aggregates scattered liquid level and pressure collection data to the central PLC, providing data support for safety management and control. Its seamless compatibility with Quantum CPUs and anti-interference design ensure communication reliability in complex industrial environments, making it an indispensable communication node in the Modbus Plus bus network.

II. Technical Parameters

Parameter Category	Specific Specifications	Industrial Adaptability Analysis
Basic Communication Parameters	Bus Type: Modbus Plus; Communication Rate: 1Mbps (fixed); Communication Distance: 1000 meters per segment (twisted pair); Supported Nodes: Up to 32 nodes per segment	The 1Mbps rate meets industrial real-time control requirements. The 1000-meter transmission distance adapts to cross-area communication in large workshops. 32 nodes support the construction of small-to-medium distributed networks.
Interface & Topology	Interface Type: 2 RJ45 interfaces (bus input/output); Supported Topologies: Bus, Ring; Terminal Matching: Built-in switchable terminal resistor	Dual RJ45 interfaces facilitate the construction of ring redundant topology, which improves network reliability. The built-in terminal resistor simplifies wiring and adapts to the deployment of bus head and tail nodes.
System Compatibility Parameters	Adaptable CPUs: Quantum 140CPU65xx/67xx series; Backplane Bus: Quantum Local Bus (10Mbps); Communication Protocol: Modbus Plus Protocol (Master/Slave modes)	It is perfectly compatible with Quantum high-performance CPUs. The 10Mbps backplane bus ensures high-speed data interaction between the module and the CPU. The master/slave mode supports flexible network role configuration.
Reliability Parameters	Operating Temperature: 0℃~60℃; Protection Class: IP20; EMC Compliance: Conforms to IEC 61000-4-2/3/4; Isolation Design: 2500Vrms isolation between bus and backplane; MTBF: ≥160,000 hours	The wide-temperature and high-isolation design resists electromagnetic interference and temperature fluctuations in workshops. IP20 adapts to control cabinet installation. An MTBF of 160,000 hours ensures 24/7 continuous operation.
Functional Parameters	Supported Data Exchange: Input/Output image area, Registers; Communication Buffer: 8KB; Supports Online Firmware Upgrade; Equipped with Network Diagnostic Function	The 8KB buffer meets the needs of large-volume data interaction. Online upgrade avoids system downtime. The diagnostic function simplifies fault troubleshooting.

III. Functional Features

Flexible Topology and Redundancy Assurance: The module supports two topologies: bus and ring. The bus topology adapts to simple linear deployment scenarios, such as assembly line equipment communication. The ring topology builds a redundant network through dual RJ45 interfaces; if a link fails, data can be transmitted through the reverse link to avoid communication interruption. In the PLC control system of power substations, the ring topology can effectively improve the transmission reliability of power supply control signals and reduce the risk of power outages caused by communication failures. Meanwhile, the module has a built-in terminal resistor, which can be enabled via a DIP switch without additional external resistors, simplifying the deployment of bus head and tail nodes.
Master-Slave Collaboration and Multi-Node Communication: As a core node of the Modbus Plus bus, the module can be flexibly configured as master or slave mode. In master mode, it can actively poll 31 slave devices on the bus (e.g., intelligent meters, distributed I/O) to collect data and issue control commands. In slave mode, it responds to access requests from the master and uploads the operating data of the local PLC. In the reactor control system of a chemical workshop, the 140NOM21100 of the central Quantum PLC is configured as the master, polling temperature and pressure data from each reactor slave while issuing process parameter adjustment commands to achieve multi-device collaborative control.
High-Speed Data Interaction and Cache Optimization: The module interacts efficiently with the CPU via the 10Mbps backplane bus. It encapsulates the data in the CPU's output image area into Modbus Plus protocol frames and sends them to the bus. At the same time, it parses the data received from the bus and writes it into the CPU's input image area. The data transmission delay is ≤3ms, meeting real-time control requirements. The built-in 8KB communication buffer adopts a "First-In-First-Out" mechanism, which can temporarily store data from multi-node interactions and avoid data loss caused by CPU busyness. In metallurgical steel rolling scenarios, this caching capability ensures synchronous collection of speed data from multiple rolling mills and issuance of commands.
Industrial-Grade Anti-Interference and Reliability: At the hardware level, a 2500Vrms photoelectric isolation design is adopted between the bus and the backplane, which effectively resists electromagnetic interference generated by motor start-stop and frequency converter operation in industrial sites and prevents interference signals from entering the PLC system and causing misoperation. At the software level, a CRC data verification mechanism is used to ensure the integrity of data transmission. In harsh environments such as cement production workshops with high dust and strong interference, the module can still stably transmit equipment operation data to ensure continuous production.
Convenient Diagnostics and O&M Optimization: The module integrates rich diagnostic functions. Engineers can read the module's communication status, node address, fault code and other information via Unity Pro software, and can also judge the operating status through the panel indicators: the "PWR" light on indicates normal power supply, the "BUS" light flashing indicates active bus communication, and the "FAULT" light on indicates a fault. When a node address conflict or link interruption occurs, the module will report specific fault codes to help engineers quickly locate the problem. In addition, it supports online firmware upgrade, enabling version updates without disassembling the module, which reduces O&M costs.

IV. Working Principle

As a bridge between the Quantum system and the Modbus Plus bus, the 140NOM21100 mainly realizes closed-loop communication of "data encapsulation - bus transmission - protocol parsing". The specific principle is as follows:

Initialization and Parameter Configuration: After the module is installed in the functional slot of the Quantum backplane, it obtains DC 5V power through the backplane bus and establishes communication with the CPU. Engineers configure the module parameters via Unity Pro software:

Network parameters: Set node address (1-31), topology type (bus/ring), and terminal resistor status.
Communication parameters: Configure master/slave mode, polling cycle, and register address and length for data interaction.

After configuration, the module restarts and loads the parameters, and the panel indicators show the normal working status.

Data Encapsulation and Transmission (Master Mode): Based on the control logic, the CPU writes the control commands or parameters to be issued into the module's send buffer. The module encapsulates the buffer data into protocol frames according to the Modbus Plus protocol specification. The frame structure includes target node address, data type, data length, check code and other information. Then, it sends the protocol frame to the Modbus Plus bus through the bus interface, while monitoring the bus occupancy status to avoid data conflicts. For example, when the master issues a speed adjustment command, it will specify the target slave address to ensure the command is accurately delivered.
Data Reception and Parsing: The module monitors the protocol frames on the bus in real time through the bus interface. When it detects that the target address is its own node address, it receives the frame and performs CRC verification. After successful verification, it parses the data content in the frame, extracts control commands or collected data, and writes them into the module's receive buffer. The CPU reads the data in the receive buffer through the backplane bus, updates the input image area or executes the corresponding control logic. If the verification fails, the module discards the frame and records a communication error log.
Ring Topology Redundancy Handling: In the ring topology configuration, the two RJ45 interfaces of the module are respectively connected to the two ends of the ring link. During normal operation, only the main link transmits data, and the backup link is in the monitoring state. If the main link fails (e.g., network cable breakage), the module detects the loss of the bus signal, immediately switches to the backup link to receive data, and reports the link fault information to the CPU through the backplane bus. After the fault is restored, it automatically switches back to the main link. The entire switching process takes ≤100ms and does not affect system operation.

V. Common Faults and Solutions

Fault Phenomenon	Industrial Scene Causes	Practical Troubleshooting Steps
"BUS" light on panel is off, no bus communication	1. Broken bus network cable or poor contact of RJ45 connector (caused by workshop vibration); 2. Terminal resistor not enabled (bus head/tail nodes); 3. Bus interface fault	Use a network cable tester to check the continuity of the network cable, remake the RJ45 connector and fasten it; 2. Check the module's DIP switch, and enable the terminal resistor for bus head and tail nodes; 3. Replace the module to a spare slot; if the fault persists, replace the module.
Master fails to poll slave, reporting "no response from node"	1. Slave node address conflict or slave not powered on; 2. Too short polling cycle causing bus congestion; 3. Slave module fault	Verify all node addresses to ensure uniqueness, and check the power supply of slave devices; 2. Extend the polling cycle (recommended ≥100ms) via Unity Pro to reduce the master's sending frequency; 3. Test with a spare slave module to locate the faulty device.
Communication data error or loss	1. Excessive on-site electromagnetic interference (e.g., near frequency converters); 2. Bus transmission distance exceeding 1000 meters causing signal attenuation; 3. Abnormal CRC verification	Replace with twisted-pair shielded network cable and ground it at one end, and keep the module away from interference sources; 2. Shorten the transmission distance or install a Modbus Plus repeater; 3. Restart the module to reinitialize communication; if ineffective, upgrade the module firmware.
Link failure in ring topology not switching automatically	1. Incorrect ring topology parameter configuration; 2. Faulty network cable of the backup link; 3. Faulty module redundancy switching function	Confirm the topology type is configured as "Ring" via Unity Pro, and check that the node address is correct; 2. Inspect the network cable of the backup link and replace the faulty one; 3. Reset the module parameters and reconfigure; if the fault persists, replace the module.
Module fails to communicate with CPU, reporting "module not recognized"	1. Poor contact between module and backplane (not locked during installation); 2. Incompatible firmware version between module and CPU; 3. Backplane bus fault	1. Power off, reinsert the module, and ensure the locking buckle is fastened; 2. Check the firmware version and upgrade it to a compatible version via Unity Pro; 3. Replace the module to another functional slot to rule out backplane faults.