Pepperl+Fuchs KFD2-UT2 Series Manual page 20

Functional Safety KFD2-UT2-(Ex)*(-1)
Operation
6. Remove the RTD simulator. Check if a lead breakage is detected.
The red LED is flashing. The output behavior in the event of a fault depends
on the device configuration.
7. Set the device back to the original settings after the test.
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