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7.14 Cascading
Achievable safety rating
Notes
All examples shown are proposals without war-
ranty. In any case the operator has to perform a
safety review of the entire site.
L+(+24 V)
Safety door
(closed)
Emergency stop
S3
S2
K3
M (0 V)
Example application for cascading
88
Category 4
EN ISO 13849-1
PLe
EN ISO 13849-1
SIL 3
EN 62061/61508
A shielded cable installation is neccessary
if the safely switched-off line (24 V Safe
at 4.2) runs outside the switch cabinet.
Robot cell
S1
UR20-PF-O-xDI-SIL
UR20-4DO-P
1.1
1.1
1.2
1.2
1.3
1.3
1.4
1.4
2.1
2.2
Reset
2.3
2.4
K4
3.1
3.1
3.2
3.2
3.3
3.3
3.4
3.4
4.1
4.1
4.2
4.2
4.3
4.3
4.4
4.4
u-remote IP20 modules for functional safety manual
The following shows the cascading of PF-O-xDI-SIL
modules. When the safety door for the robot cell is opened
in the example, the conveyor belt is also switched off at the
same time. In contrast, switching off the conveyor belt, e.g.
with the cable-pull switch, does not automatically switch off
the robot cell.
Multiple cascade levels and also multiple PF-O-xDI-SIL mod-
ules can be used on a single level. Be aware that the trigger-
ing of an PF-O-xDI-SIL module immediately switches off the
24 V supply of all subsequent safe power-feed modules. A
delay of these modules is then no longer effective.
Please regard during commissioning:
After switching on the u-remote station the man-
ual start has to be operated once for each single
cascaded PF-O-xDI-SIL module.
Cable-pull switch,
latching
S5
K3
K4
Conveyor belt
Emergency stop
S4
UR20-PF-OxDI--SIL
UR20-4DO-P
1.1
1.1
1.2
1.2
1.3
1.3
1.4
1.4
2.1
2.2
Reset
2.3
K1
K2
2.4
3.1
3.1
3.2
3.2
3.3
3.3
3.4
3.4
4.1
4.1
4.2
4.2
4.3
4.3
4.4
4.4
K1
K2
1484600000/04/06.2017
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