Dual-Channel Safety Door Monitoring With Proximity Sensors, Automatic Reset And Emergency Stop - Weidmuller UR20-4DI-4DO-PN-FSOE Manual

7.11 Dual-channel safety door monitoring with proximity sensors, automatic reset and emergency
stop
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+(+24 V)
S2
S3
M (0 V)
Example application for dual-channel safety door monitoring with proximity detectors, automatic
reset and emergency stop
Switchable modules see section 4.3
1)
1484600000/04/06.2017
7 Example applications | Dual-channel safety door monitoring with proximity sensors, automatic reset and emergency stop
Category 3 EN ISO 13849-1
PLd EN ISO 13849-1
SIL 2 EN 62061/61508
0 EN 60204-1
– Dual-channel monitoring
– Cross-connection detection
– Automatic reset
– Monitoring of external contactors
(EDM)
– Emergency stop button
– 2 proximity switches
– The power supply for the proximity
switches is not shown!
– The application must be compatible
with the automatic start-up function.
Emergency stop
S1
K3 K4
u-remote IP20 modules for functional safety manual
If the emergency stop button is pushed or at least one mag-
netic switch is opened, the UR20-PF-O-xDI-SIL switches off
the 24 V supply for the modules
thus also contactors K3 and K4. The failure of a switching
element in the emergency stop button or a cross-circuit in its
supply lines does not result in the failure of the emergency
stop mechanism and is detected within the fault-reaction
time.
The UR20-PF-O-xDI-SIL switches on the 24 V supply for
modules within the safety segment if
1)
– the emergency stop button is unlocked
– and both magnetic contacts are closed
– and the feedback circuit (NC contacts of K3 and K4) is
closed.
Contactors K3 and K4 are controlled by the PLC and can
switch on as soon as the UR20-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.
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
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 safety segment and
1)
K3
K3
K4
K4
M
85