User calibration
Notice | |
The user calibration affects the measuring range monitoring. Incorrect calibration coefficients can lead to the Status bits and Status LEDs no longer behaving as expected; see Measuring range monitoring. |
The intended purpose of the user calibration is to calibrate the device, for example, in a smaller measuring range than that calibrated by the vendor. As a result, a higher accuracy can be achieved in the smaller measuring range.
The correction function has the same form as the correction function of the vendor calibration:
| YU = GU * ( XU – OU ) | YU : Measured value after the user calibration XU : Measured value before the user calibration GU : Gain OU : Offset |
Enabling the user calibration
The user calibration is disabled in the factory. It can be enabled individually for each input. To do this, set the corresponding CoE index to TRUE:
Connection | CoE object | Parameter | ||
|---|---|---|---|---|
X01 | 8100hex | AI Settings Ch.1 | 0Ahex | Enable user calibration |
X02 | 8110hex | AI Settings Ch.2 | 0Ahex | Enable user calibration |
X05 | 8120hex | AI Settings Ch.3 | 0Ahex | Enable user calibration |
X06 | 8130hex | AI Settings Ch.4 | 0Ahex | Enable user calibration |
Setting the calibration coefficients
Set the calibration coefficients via the following CoE parameters:
Connection | CoE object | Parameter | ||
|---|---|---|---|---|
X01 | 8100hex | AI Settings Ch.1 | 17hex | User calibration offset |
18hex | User calibration gain | |||
X02 | 8110hex | AI Settings Ch.2 | 17hex | User calibration offset |
18hex | User calibration gain | |||
X05 | 8120hex | AI Settings Ch.3 | 17hex | User calibration offset |
18hex | User calibration gain | |||
X06 | 8130hex | AI Settings Ch.4 | 17hex | User calibration offset |
18hex | User calibration gain | |||