Endress+Hauser Proservo NMS80 Functional Safety Manual page 24

24
Test sequence C (feed-in real currents)
Preparation
1. Level limit value monitoring and range monitoring can also be performed when the SIL mode
is active.
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 (current)
1. Input a current directly below (MAX monitoring) or directly above (MIN monitoring) the
current limit value to be monitored (e.g. by simulation on a connected device).
2. Read the output current (mA), record it and assess for accuracy.
3. Read the relay switch status (Ω) record it and assess for accuracy.
4. Enter a current directly above (MAX monitoring) or directly below (MIN monitoring) the
current limit value to be monitored.
5. Read the output current (mA), record it and assess for accuracy.
6. Read the relay switch status (Ω) record it and assess for accuracy.
7. The test has been passed successfully if the current and the relay switch status trigger the
safety function in steps 5 and 6 only, and not in steps 2 and 3.
Procedure for range monitoring (current)
1. Input five current values within the range to be monitored (e.g. by simulation on a connected
device).
2. For every current value, read the output current (mA) and the switch status of the relay (Ω),
record them and assess for accuracy.
3. The test has been passed successfully if the current values and the switch status of the relay in
step 2 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.
E 1
2
CDI 1
i
1 3
F
2 4
G 1
2 HR
on
3
WP
POWER SIM
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. Perform the device self-check as follows. Navigate to: Setup → Advanced setup
3. Set: Input/output = Digital Xy-z
4. Check whether Contact type = Normally closed (SIL factory setting).
5. Set: Output simulation = Simulating inactive.
6. Check whether the contact is closed (resistance <1 Ω) between contacts Xy and Xz.
7. Set: Output simulation = Fault 1.
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