Siemens SITRANS P Operating Instructions Manual page 172

Functional Safety
10.2 Enabling Functional Safety
5. To confirm the validation, enter the validation key.
6. To validate the safety function, start the function test.
The device changes to the "Safety validation" device mode.
7. Confirm with "OK".
Validate safety function
1. Check the correct execution of the safety function in which the device is used.
2. Select the "Functional Safety" wizard.
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SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC