Beckhoff KL3201 Manuel d'utilisateur télécharger pdf (Page 10)

Functional description

8 KL3201, KL3202 and KL3204

Process data The process data that are transferred to the terminal bus are calculated

using the following equations:

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 compensation (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 linearisation:

Y_T = a

* Y_R

+ b

* Y_R + c

(1.2)

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

RTD

1sec

X_R

Y_R

Y_T

1:1

THS

TAS

1:1 1:1

ammount rep.

active

add. bits

(Siemens format)

Y_AUS

A_w,B_w

A_h,B_h

Siemens output

format

Linearisation

a1,b1,c1

A_a,B_a

ADC

Offset,Gain-parameter

Manufacturer

scaling

user scaling

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 24 25

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Beckhoff KL3201 Manuel d'utilisateur Page 10

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