Siemens SITRANS LR 400 Instruction Manual page 34

3.2: Device Test
3.2.1: Self-test
Check device state
The device integrates the self-test routines in the ongoing measurements; it completes
them after approx. 10 seconds. It confirms a successful self-test with the display "OK" –
"not OK" signals an error. Read out the error type according to Parameter 3.1.x.
3.2.2: Display test
Visual check of LCD
You can test the LCD with this function. The display first goes blank for 5 seconds and
then lights up for another 5 seconds so that you can determine whether individual display
points have failed.
3.3: Simulation
This parameter can support testing the correct functions of the connections during
commissioning or maintenance of the device. With the two sub-parameters, you can
temporarily replace the measured values at the analog and digital output with known
simulated output values.
Note:
The "Simulation" function influences output to the control system.
3.3.1: Simulate AO (F = 4 mA)
Simulation of the analog output signal
Value
When this parameter is accessed and a value is entered, the device sets the defined
current value which can be validated.
The parameter is ended after pressing
measured value.
Page 30 SITRANS LR 400 – INSTRUCTION MANUAL DRAFT
4 mA
10 mA
12 mA
20 mA
Error signal
so that the analog output again gives the
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