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2.1.1.8.2 Step 2 – Y
The value for Y
bit 0 of the register 32. The value X
scaling. For switched-off user scaling, the value X
to Y
The calculation occurs taking into account the configured data format and the
quality rating of the results is determined by an amplification factor and an
offset.
Configuration of the user scaling
Register 33 - Offset
Register 34 - Gain
Calculation formula:
The user scaling serves to adjust a desired process value range to the analog
output range specified through the calibration.
Furthermore, it is possible to map the calibrated 0 ... 20 mA output range so
that the 4 mA analog value is output at a zero process data value with sign and
currents smaller than 4mA can be generated with negative process data values.
The calculation for the user scaling is carried out module-internally in the
32 bit numeric range.
With the use of the user scaling, the required precision of the resolution of the
analog adjusting range is changed, but not essentially limited. It is at the
discretion of the user whether the user scaling should be used or not. With a
GainAS = 256, the resolution remains uninfluenced in the 16-bit wide numeric
range.
The value of 1/256 permits amplifications in the range from 0.0039 to
255,9960 and thus offers the user scaling a very high variation range.
WAGO-I/O-SYSTEM 750
I/O Modules
User Scaling
1
is generated with the user scaling if this is approved through
1
.
1
AS
AS
Y
= X
* Gain
/ 256 + Offset
1
IN
AS
750-563 [2 AO 0/4-20mA / 6-18V DC 16 Bit]
serves as input value for the user
IN
Description
Offset
Amplification factor
AS
Function Description
is transferred unchanged
IN
• 17
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