Endress+Hauser Proservo NMS80 Functional Safety Manual page 21

Proservo NMS80/81/83
Endress+Hauser
8. Check whether the contact is open (resistance >1 MΩ) between contacts Xy and Xz.
9. Set: Output simulation = Simulating inactive.
10. Check whether the contact is closed (resistance <1 Ω) between contacts Xy and Xz.
11. Set: Output simulation = Fault 2.
12. Check whether the contact is open (resistance >1 MΩ) between contacts Xy and Xz.
13. Set: Output simulation = Simulating active.
14. Check whether the contact is open (resistance >1 MΩ) between contacts Xy and Xz.
15. Set: Output simulation = Disable.
The test has been passed successfully if the relay resistance values in steps 5 -14 are within the
required level of accuracy.
End of test sequence A
The device has failed the proof-test if the expected current value/relay resistance value at a
specific level deviates by > ±2 %. For troubleshooting, refer to the Operating Instructions (
→  7). 99 % of dangerous, undetected failures are detected using this test (proof test
coverage, PTC = 0.99).
CAUTION
L
After test sequence A has been performed
‣
SIL mode must be reactivated (→  15).
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