•
Task
Connection of three cascaded single-beam photoelectric safety switches from the
L25 or L26 family to an UE410-MU/XU safety controller on a relay control/contac‐
tor control system.
Operating mode: With restart interlock and with external device monitoring.
•
Mode of operation
When the input conditions are valid, the system can be switched on and waits for
an input signal/switch-on signal. The system can be enabled by pressing and then
releasing the S1 pushbutton. The associated output of the UE410-MU/XU carries
voltage. When the input conditions are no longer met, the associated outputs of
the UE410-MU/XU switch off.
•
Fault analysis
A malfunction of the K1, K2 contactors is detected. The shut-down function is
retained.
In the event of manipulation (e.g., jamming) of the S1 pushbutton, the system will
not re-enable the output current circuits.
3 x L25/L26 (cascaded) with IO-Link to Flexi Classic main module and input/output expansion module
0 V
+24 V DC
FE
k1
k2
S1
2) PELV
E255446/00/2019-11-06
y
x
y
x
k2
k1
k1
k2
1)
z
z
UE410-MM/XU
I1
I2
X1
X2
S1
S3
S2
A1
I3
I4
Q1
Q2
Q3
EN
Q4
A2
Function
5
1
3
4
2
8
3
6
7
0
9
K1
K2
1
2
3
4
s
+24 V
n.c.
0 V
TE
L25S/
L26S
r
1
2
3
4
+24 V
MF
0 V
Q
L1
/C
L25E/
L26E
IO-Link
IO-Link
IO-Link
SiLink2
Master
SiLink2
Master
SiLink2
Master
L25S/
L26S
L25E/
L26E
1
2
3
4
s
+24 V
n.c.
0 V
TE
r
1
2
3
4
+24 V
MF
0 V
Q
L1
/C
L25S/
L26S
L25E/
L26E
1
2
3
4
1
2
3
4
s
+24 V
n.c.
0 V
TE
r
+24 V
MF
0 V
Q
L1
/C
Figure 9: Connection diagram for cascaded L25/L26 with IO-Link to UE410-MM and input/output expansion module
1)
Output circuits: These contacts must be incorporated into the control such that the dan‐
gerous state is brought to an end if the output circuit is open. For categories 4 and 3, they
must be incorporated on dual-channels (x, y paths). Single-channel incorporation into the
control (z path) is only possible with a single-channel control and taking the risk analysis
into account.
4
PROJECT PLANNING
22
O P E R A T I N G I N S T R U C T I O N S | L25
8024678/2020-01-24 | SICK
Subject to change without notice