Product description
EL2911 and EL2911-220022 Version: 2.0.0
4.3 Requirements for the potential group
WARNING
Prevention of feedback
Feedback must be prevented through the following measures:
• No switching of loads with a separate power supply
• Excluding a line short-circuit fault (see following alternatives)
CAUTION
Interference-free EtherCAT Terminals
In the potential group connected through the EL2911, only interference-free standard terminals must be
used. A list of the interference-free EtherCAT Terminals can be found in the Beckhoff Information System
under http://infosys.beckhoff.de
NOTE
Maximum achievable safety level for the safe output
Provided feedback is avoided by excluding line short-circuit faults, the following safety levels can be
achieved:
• EN ISO 13849-1: max. Cat. 4 / PL e
• IEC 61508: max. SIL3
• EN 62061: max. SIL2
No switching of loads with a separate power supply
Loads that have their own power supply must not be switched by standard terminals, since in this case
feedback via the load cannot be ruled out.
Fig.5: External load
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