Beckhoff EPI4 Series, Documentation

Page: 59 / 82

Commissioning and configuration
EPI4xxx, ERI4xxx 59 Version: 1.6
• 0x80nF:02 vendor calibration: Gain
User calibration, index 0x08n0:0A
The user calibration is enabled via index 0x80n0:0A. Parameterization takes place via the indices
• 0x08n0:17 user calibration: Offset
• 0x08n0:18 user calibration: Gain
User scaling, index 0x08n0:01
User scaling is enabled via index 0x08n0:01. Parameterization takes place via the indices
• 0x08n0:11 user scaling: Offset
• 0x08n0:12 user scaling: Gain
Vendor calibration
The vendor reserves the right to carry out the basic calibration of the terminal/box modules. There-
fore, the vendor calibration cannot be changed.
Calculation of process data
The terminal/box continuously logs measured values and stores the raw values of its A/D converter in ADC
raw value object 0x08nE:01. After each logging of the analog signal a correction is calculated via the vendor
calibration values. This is followed (optionally) by user scaling:
Y
H
= (X
ADC
-B
H
) * A
H
measured value after vendor calibration (corresponds to X
ADC
if index 0x08n0:0B inactive)
Y
A
= (Y
H
-B
A
) * A
A
measured value after user calibration (corresponds to Y
H
if index 0x08n0:0A inactive)
Y
S
= Y
A
* A
S
* 2
-16
+ BS measured value after user scaling (corresponds to Y
A
if index 0x08n0:01 is inactive)
Key
Name Designation Index
X
ADC
Output value of the A/D converter 0x8nE:01
B
H
Vendor calibration offset (only changeable if the object Producer codeword F008
is set) 0x08nF:01
A
H
Vendor calibration gain (can only be changed if the object Producer codeword
F008 is set) 0x08nF:02
Y
H
Measured value after vendor calibration -
B
A
User calibration offset 0x08n0:17
A
A
User calibration gain 0x08n0:18
Y
S
Measured value after user calibration -
B
S
User scaling offset (can be activated via index 0x80n0:01) 0x08n0:11
A
S
User scaling gain (can be activated via index 0x80n0:01) 0x08n0:12
Y
S
Process data for control, measured value after user scaling -