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7 Example applications
| Dual-channel safety door monitoring with magnetic switch, automatic reset and emergency stop
82
1484600000/04/06.2017
u-remote IP20 modules for functional safety manual
Achievable safety rating
Category 4
EN ISO 13849-1
PLe
EN ISO 13849-1
SIL 3
EN 62061/61508
Stop category
0
EN 60204-1
Features
–
Dual-channel monitoring PDF-M (as
per EN 60947-5-3)
–
Cross-connection detection
–
Automatic restart
–
Monitoring of external contactors
(EDM)
Safety sensor/operating
mechanism
–
Emergency stop button
–
Magnetic switch with coded magnet
Notes
The application must be compatible with
the automatic start-up function.
All examples shown are proposals without
warranty. In any case the operator has to per-
form a safety review of the entire site.
1.1
1.2
1.3
1.4
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
UR20-PF-O-xDI-SIL UR20-4DO-P
K4
K3
S1 S3
K3
K4
Reset
L+(+24V)
M (0V)
M
K4
K3
Safety door
(closed)
Emergency stop
Example application for dual-channel safety door monitoring with magnetic switch, automatic reset
and emergency stop
1)
Switchable modules see section 4.3
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
1)
within the safety segment and
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
1)
within the safety segment if:
–
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.
7.8 Dual-channel safety door monitoring with magnetic switch, automatic reset and emergency stop
Содержание UR20-4DI-4DO-PN-FSOE
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