Page 27
Operation ILR2250-100
optoNCDT ILR2250
6.6
Analog output
6.6.1
Scaling
The distance value is output via the analog output. The resolution of the analog output is 16 bit.
Output range
4 ... 20 mA, error value approx. 3 mA
Scaling
Standard scaling
Scaling to 50 ... 8000 mm
Two-point scaling
Min. distance (in mm):
Value
Max. distance (in mm):
Value
The following applies for two-point scaling:
The value
min distance
corresponds to the new start of the
measuring range, the value
max distance
corresponds to the
new end of the measuring range. Two-point scaling allows for
user-defined specification of the measuring range to be output.
-
min distance
<
max distance
12 mA
4 mA
Target
Measuring range (MR)
SMR
EMR
Distance
Distance
Signal
20 mA
3 mA
4 mA
Signal
20 mA
3 mA
Standard characteristic
User defined
characteristic
min distance max distance
Fig. 28 Scaling the analog signal
6.6.2
Calculating Measured Value from Current Output
Current output
Variables
Value range
Formula
I
OUT
Current in mA
[4; 20] Measuring range
d
=
*
MR
(
I
OUT
- 4)
16
MR
Measuring range in mm {150000}
1
d
Distance in mm
Current output with scaling
Variables
Value range
Formula
1) The actual value for the
measuring range depends,
inter alia, on the reflectivity of
the target and on whether a
reflector film is used.
I
OUT
Current in mA
[4; 20] Measuring range
d
=
16
*|
n
-
m
|
(
I
OUT
- 4)
MR
Measuring range in mm {150000}
1
m, n
Teach range in mm
[0; MR]
d
Distance in mm
[m; n]
Fields with gray background
require a selection.
Value
Fields with dark border
require entry of a value.
