System description
EL1918 13Version: 1.2.0
TwinSAFE I/O components
• The TwinSAFE I/O components are available in the formats Bus Terminal, EtherCAT Terminal,
EtherCAT plug-in module, EtherCAT Box and TwinSAFE Drive option card
• All common safety sensors and actuators can be connected
• Operation with a TwinSAFE logic component
• Typically meet the requirements of IEC 61508:2010 up to SIL 3 and ENISO13849-1:2015 up to
Category 4, PLe. More detailed information can be found in the respective user documentation
2.2.3 The fail-safe principle (Fail Stop)
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.
CAUTION
Safe state
The safe state of the TwinSAFE system is always the switched-off and de-energized state.
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