Endress+Hauser Proserve NMS80 Functional Safety Manual page 30

Use in safety instrumented systems
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2. Perform the device self-check as follows. Navigate to: Setup → Advanced setup
3. Setting: Input/output = Digital Xy-z
4. Check whether Contact type = Normally closed (SIL factory setting).
5. Setting: Output simulation = Simulating inactive.
6. Check whether the contact is closed (resistance <1 Ω) between contacts Xy and Xz.
7. Setting: Output simulation = Fault 1.
8. Check whether the contact is open (resistance >1 MΩ) between contacts Xy and Xz.
9. Setting: Output simulation = Simulating inactive.
10. Check whether the contact is closed (resistance <1 Ω) between contacts Xy and Xz.
11. Setting: Output simulation = Fault 2.
12. Check whether the contact is open (resistance >1 MΩ) between contacts Xy and Xz.
13. Setting: Output simulation = Simulating active.
14. Check whether the contact is open (resistance >1 MΩ) between contacts Xy and Xz.
15. Setting: Output simulation = Disable.
16. Reactivate SIL mode as per "Device configuration for safety-related applications"
→  14, only points 4, 5, 7, 8, 9. (All other requirements in this section have been
implemented in the context of (initial) commissioning/configuration or in the
context of this proof test.)
The test has been passed successfully if the relay resistance values in steps 6-15 are within
the required level of accuracy.
End of test sequence D
• The device has failed the proof test if the expected current value/relay resistance
values at a specific level deviate by > ±2 %. For troubleshooting, refer to the
Operating Instructions (→  8). This test detects 99 % dangerous, undetected
failures (proof test coverage, PTC = 0.99).
• If the "Expert" menu group is selected, a prompt for the access code appears on the
display. If an access code has been defined under Setup → Advanced setup
→ Administration → Define access code this code must be entered here. If no access
code was defined, the prompt can be acknowledged by pressing the "E" key.
Proserve NMS80
Endress+Hauser