Beckhoff Automation GmbH & Co. KG KL6904 PLC Module

Beckhoff Automation KL6904 is a TwinSAFE logic terminal in Beckhoff’s KL6x safety I/O family, delivering four fail-safe digital outputs for safety-critical control in industrial automation. Each 24 V DC output is rated up to 0.5 A, enabling direct switching of safety actuators and signaling devices from TwinSAFE logic without additional relays. The module is a KL bus terminal that is configured with the TwinCAT System Manager, with its safety logic loaded over the fieldbus into the KL6904 for seamless integration with Beckhoff controllers and TwinSAFE components. In terms of compliance, the KL6904 meets IEC 61508:2010 for SIL 3 and EN ISO 13849-1 Cat 4, PL e, making it suitable for high-integrity safety applications such as safeguarding doors, emergency-stop circuits, and other protective interlocks within automated systems. Its compact form and native safety integration streamline safety architecture in EtherCAT-enabled machines, reducing wiring complexity by consolidating logic and outputs in a single terminal while enabling auditable safety routines coordinated with safety inputs and TwinSAFE controllers.