Endress+Hauser Proservo NMS80 Functional Safety Manual page 22

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Test sequence B (simulate the level)
Preparation
1. Deactivate SIL mode. Navigate to: Setup → Advanced setup → Deactivate SIL/WHG and enter
the corresponding unlocking code (SIL: 7452) for the Reset write protection parameter.
2. If the "Analog" safety-related signal is used, connect a suitable measuring device
(recommended accuracy better than ±0.1 mA) to the current output.
3. If the "Digital" safety-related signal is used, connect a suitable measuring device (resistance
tester, resistance measurement), (recommended accuracy better than ±0.1 Ω) to the digital
output.
4. Determine the safety setting (level limit or range monitoring).
Procedure for level limit monitoring (level)
1. Navigate to: Expert → Sensor → Sensor diag → Start self check
2. Set: Self check = Start. Once the self check has been performed, the following appears: Status
self check= passed.
 The self check has been passed.
3. Navigate to: Diagnostics → Simulation
4. Set: Simulation distance on = On. Simulate a level directly below (MAX monitoring) or
directly above (MIN monitoring) the level limit to be monitored. To simulate the level, you
must calculate the level to the distance (value entered) (level = empty - distance).
5. Read the output current (mA), record it and assess for accuracy.
6. Read the state of the relay contact (Ω), record it and assess for accuracy.
7. Simulate a level directly above (MAX monitoring) or directly below (MIN monitoring) the level
limit.
8. Read the output current (mA), record it and assess for accuracy.
9. Read the state of the relay contact (Ω), record it and assess for accuracy.
10. The test has been passed successfully if the current values and the state of the relay contact
trigger the safety function in step 7 only, and not in step 4.
Procedure for range monitoring
1. Navigate to: Expert → Sensor → Sensor diag → Start self check
2. Set: Self check = Start. Once the self check has been performed, the following appears: Status
self check= passed.
 The self check has been passed.
3. Simulate five levels within the range to be monitored. See the procedure for level limit
monitoring (level), step 4.
4. For every level value, read the output current (mA) and the switch status of the relay (Ω),
record them and assess for accuracy.
5. The test has been passed successfully if the current values and the switch status of the relay in
step 4 are within the required accuracy limits.
Relay self-monitoring
Relay self-monitoring must only be performed if the "Digital" safety-related signal is used.
Example of terminal designation: If the Digital IO module used for the safety function is installed in
slot D and contacts 3 and 4 are used, Digital D3-4 must be used instead of Digital Xy-z below.
1
E
2
1
CDI
i
1 3
F
2 4
1
G
2 HR
3 on
WP
POWER SIM
D
1 2 3 4
C
1 2 3 4 5 6 7 8
B 1 2 3 4 5 6 7 8
A 1 2 3 4
Proservo NMS80/81/83
A0032860
Endress+Hauser