4-channel digital output terminal, TwinSAFE, 24 V DC KL2904
Diagnostic 3, 4 
Diagnostic 1, 2 
Output 3, 4 
Output 1, 2 
Power contact
+24 V
Power contact 0 V
Output 1, 2
Output 3, 4
Top view 
Contact assembly 

KL2904 | 4-channel digital output terminal, TwinSAFE, 24 V DC

The KL2904 safety Bus Terminal is a digital output terminal with four channels. It switches 24 V DC actuators with up to 0.5 A current per channel. If the Bus Terminal detects a fault, it switches off automatically (fail stop).

Technical data KL2904
Connection technology 2-wire
Number of outputs 4
Protocol TwinSAFE/Safety over EtherCAT
Fault response time ≤ watchdog time (parameterisable)
Current consumption power contacts load-dependent
Current consumption K-bus 250 mA
Installation position horizontal
Safety standard DIN EN ISO 13849-1:2008 (Cat. 4, PL e) and EN 61508:2010 (SIL 3)
Weight approx. 100 g
Protection class IP 20
Approvals/markings Overview of TwinSAFE Certifications (PDF)
Ex-Marking II 3 G Ex nA IIC T4 Gc