Aifb 2; Measured Values; Filtering - Siemens SITRANS LR560 Operating Instructions Manual

2.5.7. Display
2.5.7.1.
The time constant for the damping filter. The damping filter smooths out the
response to a sudden change in level. This is a first order filter and the
engineering unit is always in seconds. See Damping on page 144 for more
detail.)
Values
a)

2.6. AIFB 2

See AIFB 1 (2.5.): the parameters for AIFB 2 are identical to AIFB 1.

2.7. Measured Values

(for diagnostic purposes)
Read only. Allows you to view measured values for diagnostic purposes.
2.7.1. Main Output (PV– Primary Value)
The value for Level.
In AMS Device Manager, see
on page 73.
2.7.2. Output, no linearization (SV1 – Secondary Value 1)
The value for Level.
2.7.3. Output, no level offsets (SV2 – Secondary Value 2)
The value for Distance.

2.8. Filtering

2.8.1. Narrow Echo Filter
Filters out echoes of a specific width.
Values
To remove a false echo from the Echo Profile, take its width in mm and multiply
it by 0.013. Enter the result.
For example, to filter out a spike with 500 mm width, enter 6 or 7 (the closest
integer product of 500 x 0.013).
When a value is keyed in, the nearest acceptable value is entered.
7ML19985LY01
Filter Time Constant
Range: Any non-negative number can be entered
Unit: s
a)
Default: 0
To meet accuracy specification, Filter Time Constant (PV_FTIME)
must be changed from default of 0.0 s to a minimum of 10.0 seconds.
Performance
(See on page 8.)
Process Variables (Level Transducer Block - LTB)
Range: 0 to 255. Default: 0
0 = OFF
greater = wider
SITRANS LR560 (FF) – INSTRUCTION MANUAL Page 107