!
$
"
§
Figure 4: Device with system plug and system connection and one extension connection
!
Extension connection
"
System plug
§
System connection
$
Device connection
3.2.2
Absence of blind zones
The design and construction of the safety light curtain extends the protective function
to the end of the housing without any blind spots. The absence of blind zones reduces
the space requirement when integrated in the machine.
3.2.3
Beam coding
Depending on its configuration, the safety light curtain operates with 1 of 2 beam cod‐
ings: code
1 or code
2. In order to avoid mutual interference between 2 neighboring
safety light curtains, one can be operated with code
1 and the other with code
2.
3.2.4
Restart interlock
The safety light curtain has an integrated restart interlock. The function can be config‐
ured during commissioning.
A restart interlock prevents the machine from starting again once the protective device
has been triggered. First, the operator must press a reset pushbutton to return the pro‐
tective device to monitoring status. Then, in a second step, the operator can restart the
machine.
The reset pushbutton can be connected locally to the extension connection or in the
control cabinet.
3.2.5
External device monitoring (EDM)
The safety light curtain has integrated external device monitoring. The function can be
configured during commissioning.
The external device monitoring (EDM) monitors the status of downstream contactors.
In order to use the external device monitoring, positively guided contactors must be
used to switch off the machine. If the auxiliary contacts of the positively guided contac‐
tors are connected to the external device monitoring, the external device monitoring
checks whether the contactors drop off when the OSSDs are switched off.
3
PRODUCT DESCRIPTION
14
O P E R A T I N G I N S T R U C T I O N S | miniTwin4
8012624/10OM/2018-08-09 | SICK
Subject to change without notice
