Test Sequence D (Feed In Real Currents) - Endress+Hauser Proserve NMS80 Functional Safety Manual

Proserve NMS80
Endress+Hauser
5.3.4

Test sequence D (Feed in real currents)

Preparatory steps
1. Point level monitoring and range monitoring can also be performed when the SIL
mode is active.
2. If the safety-related "Analog" signal is used, connect a suitable measuring device
(recommended accuracy better than ±0.1 mA) in the installed circuit.
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 (point level or range monitoring).
Procedure for point level 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.
The test has been passed successfully if the current values and the state of the relay
contact trigger the safety function in step 4 only, and not in step 1.
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.
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
1
CDI
i
F 1 3
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 relevant unlocking code (SIL: 7452) for the Reset write protection
parameter.
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
Use in safety instrumented systems
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