SICK ReLy OSSD1

4.4.2 Enabling current paths
Important information
DANGER
H
azard due to lack of effectiveness of the protective device
b
Ensure the enabling current paths are supplied by the same voltage supply.
Cross-circuits
Cr
oss-circuits between the enabling current paths or with other signals may not be
detected and can put the machine in a dangerous state.
Measures:
b
Lay the cables in a protected manner or separately (e.g., within the control cabinet
as per IEC60204-1).
b
Take other necessary measures to achieve the required safety-related characteris‐
tic values.
4.4.3 Feedback current path
The feedback current path is used as external device monitoring for the monitoring by
t
he base device.
The status of the feedback current path (31, 32) changes as soon as the safe enabling
current paths (13, 14, 23, 24) switch. The feedback current path is not safe.
Table 4: Switching behavior of feedback current path
State of enabling current paths State of feedback current path
Closed Open
Open Closed
4.4.4 Connection diagrams
3) PELV
F2 F1
+24 V DC
0 V DC
K1K2
E324548/00/2021-09-29
k2
z
k1 k2
k1
z
x
y
x
1)
y
32
31I1 I2
24A2 14
23 13
RLY3-OSSD1
System connection System connection
+24 V DC
deTec4 SP1
2
1
3
5
6
4
7
8
r
RES
ADO
OSSD 1
OSSD 2
EDM
0 V DC
MFP 1
s
+24 V DC
n.c
In 2
In 1
n.c
.
0 V DC
MFP 1
n.c.
2
3
4
5
6
1
7
8
2)
F0
L+
L–
H1
S1
Figure 4: ReLy OSSD1 connection diagram
PROJECT PLANNING 4
8020860/1FH0/2022-10-27 | SICK O P E R A T I N G I N S T R U C T I O N S | ReLy OSSD1
13
Subject to change without notice