CX2042-N031 BECKHOFF Basic CPU Module with RS485 Interface

Product Overview

The CX2042-N031 (CX2042N031) is a high-performance basic CPU module designed for the CX2000 hardware series, engineered to handle complex industrial control tasks with high-speed processing requirements. Equipped with an Intel Xeon® D processor, this unit is optimized for multi-core applications including advanced robotics, CNC machining, and large-scale factory automation. In mission-critical environments such as oil refineries, power distribution centers, and automated logistics hubs, the CX2042-N031 serves as a robust controller that minimizes cycle times and enhances system reliability. This specific configuration features an integrated RS485 interface, pre-configured as a network end point to ensure seamless serial communication with field devices while maintaining signal integrity across the bus.

Technical Configuration

The CX2042-N031 utilizes a modular PC-based control architecture, allowing for flexible expansion via the internal high-speed bus. The integrated "N031" serial interface is a factory-installed option that utilizes a standard 9-pin D-sub socket. Unlike general-purpose configurations, this module is specifically set as an End Point, meaning the internal Termination is On and Echo is Off. This hardware-level setting simplifies network installation by providing the necessary impedance matching for the RS485 bus without requiring external resistors. The CPU supports high-performance TwinCAT 3 runtime environments, enabling deterministic real-time control and deep integration with EtherCAT terminal systems.

Technical Specifications

Technical FAQs

Does the "Termination On" setting mean I don't need external resistors?

Correct. Since this module is configured as an end point, the 120-ohm termination resistor is internally active. This module should be placed at the physical beginning or end of your RS485 segment to prevent signal reflections.

Can I change the "Without Echo" setting in the software?

The "Without Echo" configuration is handled at the hardware/firmware level of the N031 module. This ensures that the CPU does not receive its own transmitted data, simplifying the communication driver logic and reducing processing overhead for the serial stack.

What power supply module is required for the CX2042-N031?

The CX2042 series typically requires a CX2100 series power supply module. Because of the high-performance Xeon processor, ensure that the power supply module used (such as the CX2100-0014) provides sufficient current for both the CPU and any attached I/O terminals.

Engineering & Installation Guide

• Bus Termination Logic: Because the CX2042-N031 has internal termination enabled, it must be located at one of the two extreme ends of the RS485 daisy chain. If this module is placed in the middle of a multi-drop network, it will cause signal degradation. Always verify the physical network layout before commissioning.

• Thermal Environment Management: Due to the high power density of the Xeon processor, this module uses active cooling. Ensure that the air intake and exhaust vents are not obstructed. In enclosed control cabinets, verify that the total heat load does not exceed the cabinet's cooling capacity to prevent the CPU from entering thermal protection mode.

• Serial Grounding and Shielding: To prevent data corruption from electromagnetic interference (EMI), use shielded twisted-pair (STP) cables for the RS485 connection. Connect the cable shield to the metal housing of the D-sub connector to ensure a low-impedance path to the functional earth of the CX2042 system.