User Documentation

7 Example applications | Dual-channel safety door monitoring, magnetically operated interlock with manual reset and emergency stop
84 1484600000/07/11.2020u-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
K4K3Reset
S2S4
S3
UR20-PF-O-xDI-SIL UR20-4DO-P
UR20-4DI-PUR20-4DO-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