VEGA VEGAFLEX series 60 Recurring function test - Manual (Page 14)

4 Result of the recurring function test
If all test points could be terminated successfully, then the recurring
function test was successful.
Fulfilled test points
3.1 / 3.2 / 3.3 / 3.4 / 3.5 Fault detection rate λ
du
92 %
3.1 / 3.2 / 3.5 (sensor documentation
of the setup or a sensor documenta-
tion created at least 6 months ago, is
not available) Fault detection rate λ
du
88 %
The test must be repeated in regular intervals. The time periods
depend on the PFD
avg
value according to the sepcifications in the
Safety Manual (SIL).
If one of the test points (3.1 / 3.2 / 3.5) could not be terminated
successfully, there is probably an undetected dangerous failure. The
recurring function test has failed.
In this case, proof of functional safety can only be provided by moving
the level to the switching point.
Function test successful
Function test not suc-
cessful
14 Recurring function test • for VEGAFLEX series 60
4 Result of the recurring function test
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