Safety Mat - Weidmuller UR20-4DI-4DO-PN-FSOE Manual

7 Example applications | Safety mat
7.6

Safety mat

Achievable safety rating
Stop category
Features
Safety sensor/operating
mechanism
Notes
All examples shown are proposals without
warranty. In any case the operator has to per-
form a safety review of the entire site.
L+(+24V)
K5
M (0 V)
Example application for safety mat
Switchable modules see section 4.3
1)
80
Category 3 EN ISO 13849-1
PLd EN ISO 13849-1
SIL 2 EN 62061/61508
0 EN 60204-1
– Single-channel monitoring
– Cross-connection detection
– Wire break detection
– Monitoring of external contactors
(EDM)
Safety mat
– Manual reset
– Observe EN 1760-1 and EN ISO
13856-1!
– The same interface is also possible
for pressure-sensitive buffers and
pressure-sensitive strips; however
check the safety ratings during use!
– K5: Weidmüller RCIKIT(Z) 24 VDC
2CO LD/FG (connect the coil connec-
tion at the UR20-PF-O-2DI-DELAY-SIL
to 4.1 instead of to 4.2)
K3
K4
Reset
Safety mat
(not activated)
S1
u-remote IP20 modules for functional safety manual
When the safety mat is stepped on, the PF-O-xDI-SIL
switches off the 24 V supply for the modules
safety segment and thus also contactors K3 and K4. An
interruption or a cross-connection in the supply lines for the
safety mat do not result in the failure of the safety function
and is detected within before the next starting cycle.
As an alternative to both NC contacts for the reset switch,
an NO contact can be used there. One of its contacts is set
at M (0 V) and the other contact is wired through a diode to
connection 1.1 and through a diode to connection 1.3 (both
cathodes to the switch).
The PF-O-xDI-SIL switches on the 24 V supply for
modules within the safety segment if
1)
– the safety mat has not been actuated
– and the feedback circuit (NC contacts of K3 and K4) is
closed
– and the start push button has been pushed and released
again.
Contactors K3 and K4 are controlled by the PLC and can
switch on as soon as the PF-O-xDI-SIL has switched
on the 24 V supply. To reset the system, press the reset but-
ton for 0.1 to 2 s after switching on the power supply, even
when automatic reset is used.
Combined with a safety mat PF-O-xDI-SIL modules
attain safety rating Category 3 only.
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
2.3
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
within the
1)
K3
K3
K4
K4
M
1484600000/04/06.2017