7 Example applications
| Dual-channel safety door monitoring, magnetically operated interlock with manual reset and emergency stop
84
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
–
Cross-connection detection
–
Manual reset
–
Monitoring of external contactors
(EDM)
–
Off-delay via PLC
Safety sensor/operating
mechanism
–
Emergency stop button
–
Position switch with interlock
Notes
–
Exclusion of the fault “Interruption or
releasing of the activator, error in the
safety interlock”
–
The PLC must activate the interlock
directly after the safety door is closed
All examples shown are proposals without war-
ranty. In any case the operator has to perform a
safety review of the entire site.
M
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
1.1
1.2
1.3
1.4
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
2.1
2.2
2.3
2.4
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
K4
K3
K4
K3
K4
K3
Reset
S2
S4
S3
UR20-PF-O-xDI-SIL UR20-4DO-P
UR20-4DI-P
UR20-4DO-P
L+(+24 V)
M (0 V)
S1
Safety door
(closed)
Emergency stop
Example application for dual-channel safety door monitoring, magnetically operated interlock with
manual reset, stop and emergency stop
1)
Switchable modules see section 4.3
When the emergency stop button is pushed, the
PF-O-xDI-SIL switches off the 24 V supply for the
mod-
ules
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 contact as well as a cross-cir-
cuit in their supply lines does not result in the failure of the
emergency stop mechanism and is detected within the
fault-reaction time.
A stop is performed by switching off K3 and K4 via the PLC.
The door can be opened when the PLC releases the inter-
lock.
With opening of the safety door a discrepancy er-
ror between S2 and S3 occurs. This error has to
be reset with S1.
The PF-O-xDI-SIL switches on the 24 V supply for
modules
1)
within the safety segment if
–
the emergency stop button is unlocked
–
and the safety door is closed
–
and the PLC has activated and engaged the interlock
–
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.
7.10 Dual-channel safety door monitoring, magnetically operated interlock with manual reset and
emergency stop
Содержание UR20-4DI-4DO-PN-FSOE
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