Beckhoff EL1904 - Product description; EL1904 - TwinSAFE terminal with 4 digital fail-safe inputs

Product description
EL1904 19Version: 3.0.0
4 Product description
4.1 EL1904 – TwinSAFE terminal with 4 digital fail-safe
inputs
The EL1904 is a digital input terminal for encoder with potential-free contacts for 24V
DC
. The Bus Terminal
has 4 fail-safe inputs.
With two-channel connection, the EL1904 meets the requirements of IEC61508:2010SIL3,
ENISO13849-1:2015(Cat4, PLe), NRTL, UL508, UL1998 and UL991.
The TwinSAFE terminal has the typical design of an EtherCAT terminal.
Fig.4: EL1904 – TwinSAFE terminal with 4 digital fail-safe inputs