O
S
SD A
O
S
SD B
O
S
SD A
O
S
SD B
Figure 40: 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 41: No potential difference between load and protective device
6.2
Connection overview
NOTE
The USB connection may only be used temporarily and only for configuration and
diagnostics.
6
ELECTRICAL INSTALLATION
60
O P E R A T I N G I N S T R U C T I O N S | microScan3 Core I/O AIDA
8017784/1ELL/2022-01-21 | SICK
Subject to change without notice
