750-563 [2 AO 0/4-20mA / 6-18V DC 16 Bit] • 19
Function
Description
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.8.5 Step 5 – Y
DAC
Calibration
This level serves to calibrate an analog output range to the process data value
range. AS parameter for the calibration, the module will only transmit the
basic value for the minimum value of the analog output range as offset. The
basic value for the maximum value serves to calculate a linear gain. The
degree of the gain is entered as amplification factor in register 37.
The amplification factor is calculated as follows:
Gain
(A/H)K
= 8192*((BasicValue
max
– BasicValue
min
) / 65535)
Two calibration sets are provided for the module. These are divided into the
manufacturer and user calibration. Only one calibration set is ever active. The
selection occurs via bit 1 of register 32.
Configuration of the manufacturer calibration
Register Name
Description
17 Offset
HK
Manufacturer calibration offset
18 Gain
HK
Manufacturer calibration amplification factor
Configuration of the user calibration
Register Name
Description
36 Offset
AK
User calibration offset
37 Gain
AK
User calibration amplification factor
Calculation formula:
Y
DAC
= X
3
* Gain
(A/H)K
/ 8192 + Offset
(A/H)K
With the activation of the user calibration, the analog output range can be
selected freely taking into account the operating mode. In reality, the
minimum and maximum possible analog output values lie a little below or
above the named analog limits.
