Siemens Sitrans LR400 Instruction Manual page 36

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. A successful self-test is confirmed with the
display . The display
OK
error type.
3.2.2 Display test
Visual test of LCD
During the LCD test, the display is blank for five seconds and then illuminates for another
five 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 mA connections during
commissioning or maintenance of the device. With the two parameters, you can
temporarily replace the measured values at the analog and digital output with known
simulated output values.
The Simulation parameter influences output to the control system.
Note:
3.3.1 Simulate AO (F = 4 mA)
Simulation of the analog output signal
Value
When a value is entered in this parameter, the current value to be validated is defined.
Complete the parameter entry by pressing LEFT
measured value.
3.3.2 Simulate DO (F = End)
Simulation of the digital output signal
Value
Page 32 SITRANS LR400 (7ML5421) – INSTRUCTION MANUAL
signals an error. View Parameter 3.1.x to determine the
not OK
4 mA
10 mA
12 mA
20 mA
Error signal
Relay on
Relay off
End
so the analog output again gives the
7ML19985FH06