Product overview
KL320x
17
Version: 4.4
Process data
The process data that are transferred to the terminal bus are calculated using the following equations:
Variable
Meaning
X_RL
ADC value of the supply cables
X_RTD
ADC value of the temperature sensor, including one supply cable
X_R
ADC value of the temperature sensor
A_a, B_a
Manufacturer gain and offset calibration (R17, R18)
A_h, B_h
Manufacturer scaling
A_w, B_w:
User scaling
Y_R
Temperature sensor resistance value
Y_T
measured temperature in 1/16 °C
Y_THS
Temperature after manufacturer scaling (1/10 °C)
Y_TAS
Temperature after user scaling
Y_AUS
Process data to PLC
a) Calculation of the resistance value:
X_R = X_RTD-X_RL (1.0)
Y_R = A_a * (X_R - B_a) (1.1)
b) Curve linearization:
Y_T = a1 * Y_R2 + b1* Y_R + c1 (1.2)
or
Y_T = Y_R if output in Ω (1.3)
c) Neither user nor manufacturer scaling are active:
Y_AUS = Y_T (1.4)
d) Manufacturer scaling active (factory setting):
Y_THS = A_h * Y_T + B_h (1.5)
Y_AUS = Y_THS
e) User scaling active:
Y_TAS = A_w * Y_T + B_w (1.6)
Y_AUS = Y_TAS
f) Manufacturer and user scaling active: (1.7)
Y_1 = A_h * Y_T + B_h
Y_2 = A_w * Y_1 + B_w
Y_AUS = Y_2
