Beckhoff EL1904, Руководство по эксплуатации

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Product description
EL1904 14 Version: 2.1.1
3 Product description
3.1 EL1904 – TwinSAFE terminal with 4 digital fail-safe
inputs
The EL1904 is a digital input terminal for encoder with floating 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, DIN EN ISO
13849-1:2006 (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
3.2 Intended use
WARNING
Caution - Risk of injury!
TwinSAFE components may only be used for the purposes described below!
The TwinSAFE terminals expand the application range of Beckhoff Bus Terminal system with functions that
enable them to be used for machine safety applications. The TwinSAFE terminals are designed for machine
safety functions and directly associated industrial automation tasks. They are therefore only approved for
applications with a defined fail-safe state. This safe state is the wattless state. Fail-safety according to the
relevant standards is required.
The TwinSAFE Terminals enable connection of:
• 24 V
DC
sensors (EL1904) such as
emergency off pushbutton switches, pull cord switches, position switches, two-hand switches, safety
mats, light curtains, light barriers, laser scanner, etc.