Endress+Hauser Proservo NMS80 Functional Safety Manual page 20

20
Test sequence A (approach the level)
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
1. Check safety function: Approach at least one level immediately above (MAX monitoring) or
below (MIN monitoring) the limit to be monitored.
2. Check safety function: Read the output current (mA)/relay resistance value (Ω), record it and
assess for accuracy.
3. If (as an option) the function of the measuring point is to be checked immediately in front of
the switch point: Checks the function in front of MIN or MAX switch point: Approach level
immediately below (MAX monitoring) or above (MIN monitoring) the limit to be monitored.
Read the output current/relay resistance value, record it and assess for accuracy. This does not
check the safety function of the device.
4. The test has been passed successfully if the current values/relay resistance values trigger or
ensure the required function.
Procedure for range monitoring
1. Approach five levels within the range to be monitored.
2. For every level value, read the output current (mA)/relay resistance value (Ω), record it and
assess for accuracy.
3. The test has been passed successfully if the current values/relay resistance values in step 2 are
within the required level of accuracy.
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
F 1 3
2 4
1
G
2 HR
3 on
WP
SIM
POWER
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