Product description
EL2911
15
Version: 1.0.0
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 area 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 switched-off and de-energized state. Fail-
safety according to the relevant standards is required.
The TwinSAFE I/O components allow the connection of:
• 24 V
DC
sensors such as
emergency stop push-buttons, rope pull switches, position switches, two-hand switches, safety
switching mats, light curtains, light barriers, laser scanners, etc.
• 24 V
DC
actuators such as
contactors, protective door switches with tumbler, signal lamps, servo drives, etc.
Test pulses
When selecting actuators please ensure that the test pulses of the TwinSAFE component do not
lead to switching of the actuator or a diagnostic message of the TwinSAFE component.
The following TwinSAFE components were developed for these tasks:
• The EL1904 is an EtherCAT Terminal with 4 digital fail-safe inputs
• The EL2904 is an EtherCAT Terminal with 4 digital fail-safe outputs
• The EL6900 is an EtherCAT Terminal with integrated TwinSAFE logic
These TwinSAFE components are suitable for operation on the
• Beckhoff EKxxxx series Bus Couplers
• Beckhoff CXxxxx series Embedded PCs with E-bus connection
WARNING
The fail-safe principle!
The basic rule for a safety system such as TwinSAFE is that failure of a part, a system component or the
overall system must never lead to a dangerous condition. The safe state is always the
switched off
and
wattless
state.
WARNING
System limits
The TÜV SÜD certificate applies to these TwinSAFE components, the function blocks available in it, the
documentation and the engineering tool.
TwinCAT 3.1
and the
TwinSAFE Loader
are permitted as engi-
neering tools. Any deviations from these procedures or tools, particularly externally generated xml files for
TwinSAFE import or externally generated automatic project creation procedures, are not covered by the
certificate.
WARNING
Power supply from SELV/PELV power supply unit!
The TwinSAFE components must be supplied with 24 V
DC
by an SELV/PELV power supply unit with an out-
put voltage limit U
max
of 36 V
DC
. Failure to observe this can result in a loss of safety.
WARNING
Commissioning test
Before the EL2911 can be used for the safety task, the user must carry out a commissioning test so that
sensor and actuator wiring errors can be ruled out.
Summary of Contents for EL2911
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