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7.3
Dual-channel light curtain monitoring (AOPD type 4) and emergency stop monitoring
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+(+24 V)
LC1
AOPD type 4 (receiver)
–
+
M(0 V)
Example application for dual-channel light curtain monitoring (AOPD type 4) and emergency stop
monitoring
Switchable modules see section 4.3
1)
1484600000/04/06.2017
7 Example applications | Dual-channel light curtain monitoring (AOPD type 4) and emergency stop monitoring
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
– Start button
– Monitoring of external contactors
(EDM)
– Self-test of the OSSD in the AOPD
– Emergency stop button
– AOPD type 4 (2 semiconductor
outputs, P-switching)
Autostart is possible if the NC circuits
from K3 and K4 are attached to 3.3 and
3.4.
Emergency stop
S1
UR20-PF-O-DELAY-SIL
OSSD2
OSSD1
Restart
K3
K4
u-remote IP20 modules for functional safety manual
When the emergency stop button is pushed or the ac-
tive optoelectronic protective device (AOPD) reacts, the
UR20-PF-O-2DI-DELAY-SIL switches off the 24 V supply for
the modules
within the safety segment and thus also for
1)
contactors K3 and K4. The failure of a switching element
in the emergency stop button or the AOPD as well as a
cross-circuit in their supply lines does not result in the failure
of the corresponding safety device and is detected within
the fault-reaction time. For this purpose, the AOPD must
generate a test pulse on its safety outputs at least once per
second.
When using a UR20-PF-O-2DI-DELAY-SIL: If the DIP switch
which is assigned to the corresponding safety circuit is
switched on (in the example DIP switch 2 for LC1) so that
an AOPD generating own test pulses can be connected, it
might be necessary to have a shielded cable installation and
cross-circuit fault detection via the AOPD, depending on the
required safety level.
The UR20-PF-O-2DI-DELAY-SIL switches on the 24 V supply
for the modules
within the safety segment if:
1)
– the emergency stop button is unlocked
– and the active optoelectronic protective device (AOPD) is
free
– 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 UR20-PF-O-2DI-DELAY-SIL has
switched on the 24 V supply.
UR20-4DO-P
1.1
1.1
1.2
1.2
1.3
1.3
1.4
1.4
2.1
2.1
2.2
2.2
2.3
2.3
2.4
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
K3
K3
K4
K4
M
77
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