The Schweitzer Engineering Laboratories SEL-2240 Axion is a fully integrated, modular input/output (I/O) and control solution that combines the communications, built-in security, and IEC 61131 logic engine of the SEL Real-Time Automation Controller (RTAC) family with a durable suite of I/O modules that provide high-speed, deterministic control performance over an EtherCAT network. Whether your application requires a remote terminal unit (RTU) or an ultra-rugged programmable logic controller (PLC), the SEL-2240 Axion is an excellent choice.

Key Features & Specifications

• Modular I/O Expansion: Each Axion node can accommodate up to 10 modules, including a processor module, one or two power supplies, and a user-determined mix of I/O modules. A single system can support up to 60 modules or 6 nodes, each with its own RTAC module. Maximum I/O points: 1,286 digital inputs, 864 digital outputs, 8 high-speed digital outputs, 256 DC analog inputs, 128 DC analog outputs, 64 AC current inputs, and 64 AC voltage inputs.
• Flexible CPU Options: The Axion platform can be powered by various RTAC modules, including the SEL-2241 RTAC module, SEL-3530, SEL-3530-4, and SEL-3555 RTACs. These processors seamlessly interface with I/O modules and provide easy integration with other serial and Ethernet devices via preinstalled communication protocols. The RTACs also support multiple SCADA/HMI channels.
• High-Performance Communication: The Axion utilizes the EtherCAT fieldbus for high-speed, deterministic control performance. It supports a wide range of communication protocols, including DNP3, Modbus RTU/TCP, IEC 61850 MMS/GOOSE, IEC 60870-5-101/104, IEEE C37.118, OPC UA, SEL Mirrored Bits, and more.
• Rugged Design for Harsh Environments: All SEL Axion modules are rated from –40° to +85°C and can optionally include conformal coating. The system is designed to withstand vibration, electrical surges, fast transients, and extreme temperatures, meeting or exceeding IEEE 1613 standards.
• IEC 61131-3 Logic Engine: The Axion features a complete IEC 61131 logic engine, supporting structured text, ladder logic, and continuous function chart programming languages. Engineers can run custom control logic at two different rates (as fast as 4 ms for critical control loops).
• Integrated Cybersecurity: The Axion includes exe-GUARD whitelist antivirus technology, LDAP user authentication, and NERC/CIP compliance features. It also enforces corporate logging and port control policies to maintain security perimeter integrity.
• Simple Setup with Free Software: The ACSELERATOR RTAC SEL-5033 configuration software is included at no additional cost. It provides everything needed to set up I/O, communications, security, and programmable logic in one easy-to-use package, with standard device templates for quick system building.
• Integrated Web-Based HMI: The SEL-2241 RTAC module includes an embedded web server with a flexible graphical HMI system, allowing custom displays to be built quickly without mapping data tags. No special software is needed for viewing HMI displays.
• Synchronized Current and Voltage Measurements: The Axion CT/PT module provides high-accuracy current and voltage measurements with synchronized sampling. Multiple CT/PT modules sample all measurements simultaneously, enabling time-deterministic control applications such as load shedding, microgrid control, and autosynchronization.

Applications

The SEL-2240 Axion is ideal for a wide range of utility and industrial applications, including substation automation, data concentration, substation bay control, digital fault recording, power system monitoring, load shedding, microgrid control, and remote terminal unit (RTU) replacement. Its flexible architecture and integrated security make it suitable for demanding environments such as electric power substations, industrial facilities, renewable energy sites, and transportation systems.