Safety category 4
ULCT safety light barriers belong to safety category 4 according to EN 954-1 and IEC 61496 / EN 61496.
Devices in safety category 4 are self-monitoring, contactless protective mechanisms representing the highest safety class for
devices of this kind.
Beam spacing
The spacing between the individual lens centres of ULCT light curtains.
Valve / contactor control (EDM - external device monitoring)
Before the switching outputs are enabled, the contactor control system always checks whether the connected switching elements
(relays, contactors and valves) are released. Only then can the switching outputs be enabled again. This prevents a failure of the
switching elements (relays, contactors and valves) used to control hazardous movement.
Restart interlock
This function prevents automatic enabling of the switching outputs following interruption and subsequent clearing of the protective
field (e.g. caused by passage through the field).
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Definition of terms
FIESSLER
E L E K T R O N I K
Fiessler Elektronik GmbH & Co. KG
Telefon: +49 (0) 711 / 91 96 97-0 Internet: http://www.fiessler.de
Telefax: +49 (0) 711 / 91 96 97-50 eMail: [email protected]
Doku Nr. 1121 Stand 08.01. 2018 RK/Aui