Siemens Sitrans LR250 Operating Instructions Manual page 92

2.6.8. Display
2.6.8.1.
The time constant for the damping filter. The damping filter smooths out the
response to a sudden change in level. This is an exponential filter and the
engineering unit is always in seconds (see Damping on page 128 for more
detail
Values
2.6.8.2.
Note:
Engineering unit to be displayed with the output value
Options
2.6.8.3.
If the desired unit is not listed in Unit (2.6.8.2.) you can define it in Out Unit
Text.
2.6.8.4.
The number of digits to display after the decimal point. (The LCD is limited
to displaying two decimal places in Measurement mode. In SIMATIC PDM
up to seven decimal places may be used to display measured values.)
Options
2.6.9. Fail-safe Mode
2.6.9.1.
Fail-safe Mode occurs if the status of the input value is bad, or if the device
has been put into Fail-safe mode using Simulation. Mode defines the
material level to be reported when the LOE (Loss of Echo) timer expires.
Options
Page 86 SITRANS LR250 (PROFIBUS PA) – OPERATING INSTRUCTIONS
Filter Time Constant
).
Range 0 to 600 s
Default: 10 s
Unit
Additional units are available in SIMATIC PDM.
m, cm, mm, ft, in, cu m, L, HL, cu in, cu ft, cu yd, gal, imp gal,
bushels, Bbl, Bbl liquid, percent, PA, Follow out unit
*
percent
Out Unit Text
Decimal Point
Mode
SUB VALUE
* LAST VALUE
USE BAD VALUE
Range: 0, 1, 2, 3, 4, 5, 6, 7
Default: 2
Substitute value. Value (2.6.9.2.) used as
output value.
Last value. (Store last valid output value).
Use bad value. (Calculated output value is
incorrect).
7ML19985JF04