3
Product description
This chapter provides information on the principle of operation of the safe sensor cas‐
cade and provides application examples.
3.1
Structure and function
The Flexi Loop safe sensor cascade is an expansion for the Flexi Soft or Flexi Classic
system. A safe sensor cascade comprises individual Flexi Loop nodes that are con‐
nected to the safety controller. The Flexi Loop nodes make it possible to collect informa‐
tion from physically distributed safety sensors and safety switches.
Figure 1: Flexi Loop safe sensor cascade
1
Flexi Soft
2
Flexi Classic with MSTR Flexi Loop accessory
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Safety sensors with monitored semiconductor output (OSSD)
4
Electro-mechanical safety switches
5
Flexi Loop
Dual-channel, equivalent switching, electro-mechanical safety switches (e.g. reed
switches) or safety sensors with monitored semiconductor output (OSSD) (e.g. safety
light curtains or safety laser scanners) can be connected to the Flexi Loop nodes.
The main function of the Flexi Loop nodes is the safe and quick monitoring of the
switches and sensors connected so as to provide a common shutdown criterion to the
safety controller.
Diagnostic functions make it possible to locate which safety sensor or safety switch has
shut down for which reason. Discrepancy or sequence errors are detected by means of
testing, as are cross-circuits or short-circuits on the sensors or switches.
PRODUCT DESCRIPTION
3
8015836/YT10/2016-05-24 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi Loop
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Subject to change without notice
