O
S
SD A
O
S
SD B
O
S
SD A
O
S
SD B
Figure 39: Connection of the OSSDs of an OSSD pair
DANGER
Hazard due to lack of effectiveness of the protective device
The dangerous state may not be stopped in the event of non-compliance.
b
Prevent the formation of a potential difference between the load and the protec‐
tive device.
b
If you connect loads to the OSSDs (safety outputs) that then also switch if con‐
trolled with negative voltage (e.g., electro-mechanical contactor without reverse
polarity protection diode), you must connect the 0 V connections of these loads
and those of the corresponding protective device individually and directly to the
same 0 V terminal strip. In the event of a fault, this is the only way to ensure that
there can be no potential difference between the 0 V connections of the loads and
those of the corresponding protective device.
O
S
SD A
O
S
SD B
O
S
SD A
O
S
SD B
Figure 40: No potential difference between load and protective device
ELECTRICAL INSTALLATION
6
8023152/1G5N/2022-06-28 | SICK
O P E R A T I N G I N S T R U C T I O N S | outdoorScan3 Core I/O
67
Subject to change without notice