EL2904 – BECKHOFF
EL2904 | EtherCAT Terminal, 4-channel digital output, 24 V DC, 0.5 A, TwinSAFE
The EL2904 TwinSAFE component is a digital output terminal with four channels. It switches 24 V DC actuators with up to 0.5 A per channel and has four fail-safe outputs. The outputs are controlled by a TwinSAFE Logic-capable component via FSoE. The component automatically switches off if it detects an error (fail-stop).
The EL2904 has safety parameters to specifically adapt the functionality to the respective safety requirements. For example, a current measurement at the outputs and a test of the outputs can be configured in order to be able to detect cross-circuits among other things and to react appropriately.
In addition, standard outputs can be activated for the EL2904. As a result, corresponding standard outputs are available in the process image in parallel and internally ANDed with the safe outputs of the EL2904. The safe output signals, which are controlled by a TwinSAFE Logic, thus issue the safe release for the standard signals, which can be triggered by the non-safety oriented control system independently of the cycle of the safety controller and FSoE. This allows faster switching times of the outputs, provided that the safety controller issues the necessary release for the output.
The safety parameters are not stored directly on the component, but are transmitted to the component via a TwinSAFE Logic-capable component when the safety application is started. This simplifies service procedures, because the component can simply be replaced. The safety-relevant parameters are transferred to the new component when the safety application is restarted.
4 safe outputs
integrated current measurement
testing of the channels can be activated
Standard outputs can be activated with integrated AND connection with a safe output signal
Technical data EL2904
Connection technology 1-/2-wire
Specification output of output signals
Number of outputs 4
Max. output current 0.5 A (per channel), min. 20 mA (with active current measurement)
Protocol TwinSAFE/Safety over EtherCAT
Fault response time ≤ watchdog time (parameterizable)
Current consumption power contacts load-dependent
Current consumption E-bus typ. 221 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
IP protection rating IP20
Ex marking II 3 G Ex nA IIC T4 Gc
Housing data EL-24-2x8pin
Design form compact terminal housing with signal LEDs
Dimensions (W x H x D) 24 mm x 100 mm x 68 mm
Installation on 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means of double slot and key connection
Marking labeling of the BZxxx series
Wiring solid conductor (e), flexible conductor (f) and ferrule (a): spring actuation by screwdriver
Connection cross-section s*: 0.08…2.5 mm²,
st*: 0.08…2.5 mm²,
f*: 0.14…1.5 mm²
Connection cross-section AWG s*: AWG 28…14,
st*: AWG 28…14,
f*: AWG 26…16
Stripping length 8…9 mm
Current load power contacts Imax: 10 A
*s: solid wire; st: stranded wire; f: with ferrule
From: 1.250,00 € IVA esc.