INTEGRATED

General functions
Multi-scan
Increases the noise immunity against powerful
external light sources (multi-scan)
If noise and disturbances are expected due to powerful
external light sources in rugged ambient conditions –
for instance as a result of stroboscopic lamps or welding
robots – if a beam is interrupted, it is often more practical
to first wait until the interruption continues before
the outputs are shut down. This increases the degree of
availability of the plant/system whereby the response
time is increased and therefore the safety clearance.
Transmission channels
2
1
Transmission channels
In order to be able to differentiate between the transmitted
infrared light and ambient light and to avoid the
infrared light from being influenced by e.g. warning
lights of passing forklift trucks or sparks from welding
equipment, the infrared light is transmitted in pulse
packages. The light curtains, light grids and transceivers
are equipped with two transmission channels.
1 Transmission channel 1
2 Transmission channel 2
Contactor monitoring
The contactor monitoring is used to monitor the contactors,
relays or valves connected downstream from
the light curtain. In this case, switching elements with
positively driven checkback signal contacts are required.
Start/restart inhibit
The start/restart inhibit function can be activated in
order to prevent that the plant or system immediately
resumes operation after the protective field has been
interrupted and then becomes free again. When securing
access to machines etc., it is absolutely mandatory
that the start/restart inhibit function is used. The reason
for this is that only the access to the hazardous
zone is monitored, but not the area between the protective
field and the potentially hazardous motion.
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