Operating Instructions
Chapter
6
UE 440/470
8 010 432/P097/14-03-05
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
49
Electrical installation
6.2
Connection of contact-based safety sensors
6.2.1
Single channel input devices and sensors
The single channel inputs are only approved for safety functions if the following
conditions are met!
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The cables are to be installed in accordance with the category to be used, (EN 954-1);
e.g. protected installation, single sheath with shielding etc.
You can connect several single channel input devices and sensors to the UE 440/470.
You can use N/C contacts (
) or N/O contacts (
) as the input device or sensor. If you
have configured input devices or sensors without testing, connect them to 24 V DC. If you
have configured input devices or sensors with testing, connect them to the test outputs of
the safety controller.
6.2.2
Dual channel input devices and sensors
You can connect several dual channel input devices and sensors to the UE 440/470.
Prevent cross-circuits with non-testable dual channel input devices!
With non-testable dual channel input devices and sensors, measures for cross-circuit
detection must be taken at the outputs, or they must be protected from short-circuiting
and cross-circuiting. These measures depend on the category to be implemented in
accordance with EN 954-1.
%
ATTENTION
Fig. 14: Examples for the
connection of single channel
input devices or sensors
%
ATTENTION
Connection to
24 V DC
Connection to
test output