Pepperl+Fuchs KCD2-UT2-1 Manual page 28

Functional Safety KCD2-UT2-(Ex)1, HiC2081
Operation
5.3.5 Additional Versions
Proof Test for Output as Current Sink
The criteria for a successful repeat test, which are specified for the output as a current source,
are also valid for the output as current sink. In addition to the test setup described above, a
voltage source must be connected to the output to simulate the original application.
Proof Test Coverage (PTC)
The proof test coverage of the device is assumed to be 90 %.
With  = 69 FIT of the device, the proof test can therefore only detect 62 FIT.
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