Beckhoff KL3302, Documentation

Page: 14 / 51

Product overview
KL3311, KL3312, KL3314 and KL3302 14 Version: 4.2
Calculation of process data
The process data that are transferred to the Bus Coupler are calculated using the following equations:
T
ref
= A
00
* X_ref
U
ref
= a
1
* T
ref
2
+ b
1
* T
ref
+ c
1
(1.0)
(1.1)
Voltage value of the cold junction
U
m1
= A_a * X_ X_m + B_a
U
k
= U
ref
+ U
m1
T = a
0
* U
k
2
+ b
0
* U
k
+ c
0
(1.2)
(1.3)
(1.4)
Measured temperature in 1/16°C
Tout = T (1.5) Neither user nor manufacturer scaling is active
T
h
= A_h * T + B_h
Tout = T
h
(1.6) Manufacturer scaling active (factory setting)
T
a
= A_w * T + B_w
Tout = T
a
(1.7) User scaling active
Th = A_h * T + B_h
Ta = A_w * T + B_w
Tout = Ta
(1.7) Manufacturer and user scaling active
Key
Name Name Register
X_ref Output value of the A/D converter
T
ref
Temperature of the cold junction
U
ref
Voltage value of the cold junction
X_m ADC value of the temperature sensor
U
m1
Voltage value of the temperature sensor
A_a Vendor calibration: Gain R17
B_a Vendor calibration: Offset R18
A_h Manufacturer scaling: Gain R20
B_h Manufacturer scaling: Offset R19
A_w User scaling: Gain R34
B_w User scaling: Offset R33
U
k
Sum of U
ref
and U
m1
T Measured temperature in 1/16°C
T
h
Temperature after vendor scaling (1/10 °C)
T
a
Temperature after user scaling
Tout Process data to PLC
The equations of the straight line are enabled via register R32
Fig. 4: Data Flow