The UE401 evaluation unit safely and reliably evaluates the signals of the L4000 Systems single-beam photoelectric safety switches. It can also be used to execute the restart interlock and external device monitoring (EDM) functions.


  • Restart interlock
  • External device monitoring (EDM)
  • Cascading single-beam photoelectric safety switches
  • Fast response time
  • Slim housing


Applications Evaluation unit
Safety integrity level SIL3 (IEC 61508) 1)
SILCL3 (EN 62061) 1)
Category Category 4 (EN ISO 13849) 1)
Performance level PL e (EN ISO 13849)
Configuration method Hard wired
Housing width 22.6 mm

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