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

7 Example applications | Dual-channel safety door monitoring with magnetic switch, automatic reset and emergency stop
7.8

Dual-channel safety door monitoring with magnetic switch, 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 magnetic switch, automatic reset
and emergency stop
Switchable modules see section 4.3
1)
82
Category 4 EN ISO 13849-1
PLe EN ISO 13849-1
SIL 3 EN 62061/61508
0 EN 60204-1
– Dual-channel monitoring PDF-M (as
per EN 60947-5-3)
– Cross-connection detection
– Automatic restart
– Monitoring of external contactors
(EDM)
– Emergency stop button
– Magnetic switch with coded magnet
The application must be compatible with
the automatic start-up function.
Emergency stop
Safety door
(closed)
S1 S3
K3 K4
u-remote IP20 modules for functional safety manual
When the emergency stop button is pushed or the safety
door is opened, the 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 the safety door as
well as a cross-circuit in their supply lines does not result in
the failure of the emergency stop mechanism and is detect-
ed within the fault-reaction time.
The PF-O-xDI-SIL switches on the 24 V supply for the
modules within the safety segment if:
1)
– 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 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
2.3
Reset
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 and
1)
K3
K3
K4
K4
M
1484600000/04/06.2017