The Beckhoff EJ9400 EtherCAT Plug-in Module is a dedicated power supply component designed to deliver reliable energy distribution to the E-bus within modular EtherCAT plug-in systems. As part of the EJ series, which is optimised for high-density and application-specific I/O assemblies, the EJ9400 plays a critical role in ensuring stable and efficient operation of decentralised control solutions.

Engineered for 24 V DC input voltage (-15%/+20%), the EJ9400 converts incoming supply power into a regulated output for the E-bus, delivering up to 2.5 A of output current. This capacity is sufficient to supply multiple plug-in modules, supporting a wide range of automation tasks. By powering the bus directly, it reduces dependency on external supplies and simplifies system architecture, making it particularly useful in modular machine designs.

The EJ9400 is highly efficient in terms of power handling. Its input current consumption is approximately 10 mA + (E-bus/6.25), while the current drawn from the system supply (US) is 10 mA + (∑ E-bus current/7.2). These characteristics ensure effective utilisation of available energy while maintaining safe and stable distribution across the connected modules.

Despite its compact dimensions and light weight (approx. 30 g), the EJ9400 is built for industrial-grade reliability. With an operating temperature range of -25°C to +60°C, it can withstand demanding environmental conditions typically found in factory automation, packaging, assembly systems, and other decentralised installations.

As with other members of the EJ plug-in series, the EJ9400 is optimised for high-volume machine production. Its plug-in form factor enables fast and error-free installation, reducing wiring effort and assembly time compared to conventional I/O solutions. This design philosophy makes it a cost-effective choice for OEMs who require both modularity and scalability in their automation platforms.

The EJ9400 is particularly valuable in applications where multiple I/O modules require stable and consistent power delivery. By centralising the E-bus power supply, it helps streamline electrical design, improve reliability, and simplify diagnostics. Its integration ensures that system designers can focus on functional modules without worrying about bus power stability.

In summary, the Beckhoff EJ9400 EtherCAT Plug-in Module is a compact yet powerful solution for delivering E-bus power in modular automation systems. With 24 V DC input, 2.5 A output capability, lightweight design, and rugged operating characteristics, it provides a dependable backbone for energy distribution within the EJ series. Its efficiency, scalability, and ease of integration make it an essential building block for engineers designing modern, decentralised automation systems.