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

7.5

Dual-channel safety door monitoring with 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+(+24V)
M (0V)
Example application for dual-channel safety door monitoring with 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 automatic reset and emergency stop
Category 4 EN ISO 13849-1
PLe EN ISO 13849-1
SIL 3 EN 62061/61508
0 EN 60204-1
– Dual-channel monitoring
– Cross-connection detection
– Automatic reset
– Monitoring of external contactors
(EDM)
– Emergency stop button
– Position switch
The application must be compatible with
the automatic start-up function.
Safety door (closed) Emergency stop
S3
S1
S2
K3 K4
u-remote IP20 modules for functional safety manual
When the emergency stop button is pushed or the safety
door is opened, the UR20-PF-O-2DI-DELAY-SIL switches off
the 24 V supply for the modules
and thus also contactors K3 and K4. The failure of a switch-
ing element in the emergency stop button or the safety door
contacts as well as a cross-circuit in their 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-2DI-DELAY-SIL switches on the 24 V supply
for the following modules
– the emergency stop button is unlocked
– and the safety door is 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-2DI-DELAY-SIL module
has switched on the 24 V supply. To reset the system, press
the reset button 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 the safety segment
1)
within the safety segment if:
1)
K3
K3
K4
K4
M
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