SEL-2240 Axion Rugged Digital I/O, Analog Inputs, Current and Voltage Measurements, and Control for Your Toughest Applications The SEL Axion® is a fully integrated modular digital I/O, analog input, current and voltage measurements, and control solutions suitable for many utility and industrial applications. It 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® backplane. Major Features and Benefits ➤ High-Speed and High-Accuracy DC Analog Control. The Axion DC Analog Output module provides high-accuracy current and voltage control signals for low-level self-wetted (sourcing) control applications. ➤ Proportional Integral Derivative (PID) Control. The PID function block provides advanced closedloop control for analog set points commonly used in generator and process control. ➤ Synchronized Current and Voltage Measurements. The Axion CT/PT module provides high-accuracy current and voltage measurements with the advantage of synchronized measurements. Multiple CT/PT modules in an Axion system sample all measurements at the same time to ensure a common reference for all voltages and currents. This enables many time deterministic control applications without performing additional processing to align the measurements to a reference. Utilize this capability to accomplish complex control schemes including load shedding, microgrid control, and autosynchronization. ➤ Top of Second Synchronized Measurements. When connected to IRIG, the Axion synchronizes the measurement of all CT/PT modules to the top of the second. This enables Axions in geographically dispersed locations to run algorithms on voltage and current measurements and provide time-aligned data from all of the Axion modules. This expands time-deterministic control capability to wide-area applications since the CT/PT measurements from multiple Axion systems are all synchronized. Schweitzer Engineering Laboratories, Inc.

RTU and PLC in a Single System. Employ the Axion’s I/O, SCADA communications, and control logic support in many industrial and utility applications. Simple Setup With ACSELERATOR RTAC® SEL-5033 Software. Use standard device templates to build a system, including I/O modules, quickly. Flexible I/O Selections. Choose a custom mix of digital and analog I/O modules that suit the application. Include hundreds of points in a single panel, all connected to a deterministic EtherCAT backplane. Advanced User Authentication and System Security. Enforce LDAP user accounts to maintain security perimeter integrity....

Product Overview Functional Diagram Test Functions Control Enable/Disable Force Values RTAC Module Including IEC 61131 logic engine and system database EtherCAT Activity Indicators Port LEDs Programmable LEDs Precise Time Client/Server Protocols Web Interface Optional HMI User Administration Logging / Alarms Contact Outputs Security Firewall Process Inputs Communications Ports Functional Diagram Flexible System Architecture Today's monitoring and control applications need flexible system architectures and integrated security. The Axion meets these needs by using SEL RTAC modules as the system...

Modules Installed in Chassis/Backplane With Spare Slots Each Axion node is mounted in a chassis/backplane (model SEL-2242) that provides a means for each node to include a custom arrangement of modules. A single node can contain as many as nine modules. Use any combination, quantity, and sequence of modules that suits the application. also support multiple SCADA/HMI channels. For high speed communication, use EtherCAT fieldbus connections to I/O modules or optional IEC 61850 GOOSE messaging with station IEDs. Poll data sets and reports from other IEDs with optional IEC 61850 MMS client. The node...

Secure Operation You can use the built-in web interface to manage user accounts and system alarms remotely. Each user account has a unique user name, password, and assigned role that defines system permissions. You can also configure the system to use LDAP central authentication for user account management. There are web pages for monitoring user logs and maintaining network policies. By enabling Ethernet and serial ports independently, you can minimize any security threat from unused but enabled ports. Employ SSH encryption for remote engineering access to further protect the system. Combine...

module’s frequency and power elements, the powerful logic engine in the Axion incorporates system variables into fast acting control logic for underfrequency or demand control load shedding. Complete with the HMI, the Axion is a standalone control system for many remedial action schemes. G1 Autosynchronization Systems Use multiple CT/PT and I/O modules to create advanced and highly scalable autosynchronization systems. Automatically adjust the governor exciter controls as necessary to provide safe, secure, and unattended synchronization of generation onto the power system. With synchronized sampling...

The following diagram illustrates use of the Axion as a distributed RTU communicating over DNP to a SCADA master. RTAC Master Axion EtherCAT Star Network Topology Figure 10 illustrates connections for an EtherCAT sequential topology with six Axion nodes. Each node uses a single SEL-2243 Power Coupler to provide connections to the previous and next node in the EtherCAT network. RTAC Master RTACs Distributed With RTUs Systems that do not need autonomous operation at each RTU can use a central SEL-2241 and communicate to the remote nodes through the SEL-2243 Power Couplers. This architecture offers...

Synchrophasor Concentrator When you use single or dual power couplers, the Axion serves as a low-cost remote I/O module. As many as 60 modules or six nodes can connect to one resident SEL-2241 RTAC or to a separate SEL-3530 RTAC. The Axion is an excellent teleprotection device that provides through EtherCAT a simple means for expanding the number of I/O points available in an automation system at rapid data acquisition rates. Use standard protocols, such as DNP3, to move synchrophasor data to SCADA operation centers. Include time stamps and time quality in the SCADA message to allow for system-wide...