User's Manual

7ML19985FH04 SITRANS LR 400 – INSTRUCTION MANUAL Page 38
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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 approximately 10 seconds. It confirms a successful self-test with the
display . The display signals an error. Read out the error type according to
Parameter 3.1.x.
3.2.2: Display test
Visual check of LCD
During the test of the LCD, 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 that can be validated.
Complete the parameter function by pressing LEFT so the analog output again gives
the measured value.
Note: The Simulation parameter influences output to the control system.
Value
4 mA
10 mA
12 mA
20 mA
Error signal
OK
not OK