Safety category 4
The ULVT safety light barriers belong to safety category 4 as per EN 945-1 and IEC 61496 / EN 61496.
Devices of safety category 4 comprise self-monitoring photo-electric guards and represent the highest safety class for photo-
Beam spacing
The distance (gap) between the centres of the individual lenses on ULVT/BLVT... safety light barriers is called the beam distance/
beam spacing. The ULVT/BLVT... safety light barriers are supplied with a lens grid of 7.5 mm, respective and 14mm.
Valve or contactor control
Prior to each release of the switching outputs, the contactor control identifies whether the connected switching elements (relays,
contactors or valves) have fallen. Only when this is so can a new release of the switching inputs be performed. This also prevents
the dangerous failure of the switching elements (relays, contactors, valves) of the hazardous movement.
Restart interlock
The restart interlock prevents the automatic release of the switching outputs subsequent to the interruption and reactivation of the
protective field (e.g. due to walking through the protective field).
2 Terminology
FIESSLER
E L E K T R O N I K
7
Fiessler Elektronik GmbH & Co. KG
Doku Nr. 958 Stand 22.01.2018 RK
Phone: +49 (0) 711 / 91 96 97-0 Internet: http://www.fiessler.de
Fax : +49 (0) 711 / 91 96 97-50 eMail: info@fiessler.de
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