User's Manual

Page 30 SITRANS LR 400 – INSTRUCTION MANUAL DRAFT 7ML19985FH01
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Parameters (HART)
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.
3.3.1: Simulate AO (F = 4 mA)
Simulation of the analog output signal
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 so that the analog output again gives the
measured value.
Value
4 mA
10 mA
12 mA
20 mA
Error signal
Note: The “Simulation” function influences output to the control system.
chap6.fm Page 30 Tuesday, October 9, 2001 2:26 PM