Avoiding any potential difference between load and protective device
If you connect loads to the output signal switching devices (switching outputs) that then
also switch if controlled with negative voltage (e.g., electro-mechanical contactor with‐
out reverse polarity protection diode), you must connect the 0 V connections of these
loads and those of the corresponding protective device separately and also 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.
Figure 13: No potential difference between load and protective device
6.2
Notes on cULus
The following conditions must also be fulfilled in order to use and apply the equipment
in accordance with UL 508 requirements:
•
The voltage supply must conform to Class 2 according to UL 508.
•
Connections In 1 and In 2 must conform to Class 2 according to UL 508.
•
The device must have 1 A fuse protection.
6.3
Device connection (M12, 5-pin)
1
2
3
4
5
Figure 14: Device connection (male connector, M12, 5-pin, A-coded)
Table 7: Device connection pin assignment (male connector, M12, 5-pin, A-coded)
Pin
Wire color
1)
Designation
Description
1
Brown
+24 V DC
24 V DC voltage supply
2
White
OSSD 1
Output OSSD 1
3
Blue
0 V
0 V DC voltage supply
4
Black
OSSD 2
Output OSSD 2
5
Gray
Aux
Application diagnostic output
(not safe)
1)
Applies to the connecting cables recommended as accessories.
b
Ensure the plug connector is tightly connected.
6
ELECTRICAL INSTALLATION
24
O P E R A T I N G I N S T R U C T I O N S | STR1
8018754/12IU/2020-01-30 | SICK
Subject to change without notice
