Description

The Schneider Electric 990NAD23000 is a dedicated IP20 Modbus Plus junction box with line terminal, designed as a connection accessory for Schneider Electric’s Modicon automation platform range . This compact device serves as a critical network tap, enabling devices to connect to the Modbus Plus trunk cable and facilitating reliable communication across the distributed control network .

As a component of the Modicon Quantum, Premium, Momentum, and TSX Micro platforms, the 990NAD23000 provides a screw-terminal interface for trunk and drop cable connections . Its lightweight design and jumper-configurable termination make it a versatile solution for extending, branching, or terminating Modbus Plus segments in industrial automation architectures.

Application Scenarios

In a large automotive manufacturing plant using Modicon Quantum controllers to coordinate assembly line conveyors and robotic workcells, the Schneider Electric 990NAD23000 is deployed as a junction point connecting a new welding robot to the existing Modbus Plus trunk line. The integrator selects the 990NAD23000 for its jumper-configurable termination, allowing it to function as either a drop tap (with termination disabled) or as a line terminator at the network’s end. The installation team completes the connection using the recommended wiring tool (043509383) , and the robot communicates with the main PLC within minutes. The lightweight, IP20-rated housing protects the connections from dust in the production environment while maintaining easy access for maintenance.

At a water treatment facility, legacy Modbus Plus devices are being integrated into a modern SCADA system. The 990NAD23000 serves as a field junction box, merging signals from multiple flow meters and pressure sensors into the main trunk cable. The junction box’s compatibility with the entire Modicon automation platform range means it works seamlessly alongside both new and existing controllers without requiring additional adapters or configuration software . Plant engineers appreciate that the Schneider Electric 990NAD23000 can be used on the same network as other connectors like the AS-MBKT-xxx series, with only termination settings to manage .

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