Delta DVP-ES2

4 Temperature Measurement Module DVP 04PT-E2
4.7.2 Adjusting PT Conversion Curve
1. Description
 If there is certain deviation in the measurement results, you can make adjustments on the Offset value to
modify the conversion curve according to your actual needs. For example, if the deviation temperature
from the target temperature (measured temperature) is 2
°C, set the Offset of CH1 as 20 (2°C /0.1°C = 20).











 Offset
X
Y
)C( 1 . 0
)C(
Y=Digital output, X= Measured input
Example: If X= 2
°C, Y=?
020
)C( 1 . 0
)C( 2












Y
 You only need to set up the PT conversion curve for once. Set up CR#40 (Set value changing prohibited)
to prevent incorrect operations.
2. Adjusted Curve
+8,000
-1,800
+800
-180
C
Digital output
Measured
temperature input
C
+8,000
-1,800
800
-180
C
Digital output
Measured
temperature input
C
-1,820
+7,980
2
Offset
3. Devices
 X0 = On: Set the input mode of the signals at CH1 as mode 0.
 X1 = On: Set Offset value of CH1 as 20 (2C).
 M0 = On: Disable CH1 set value changing.
4. Program explanation
 When X0 = On, set CR#2 as K0 (H’0000), i.e. the signal input mode at CH1 is mode 0 (PT100 mode).
 When X1 = On, write K20 (Offset value of CH1) into CR#28.
 When X1 goes from On to Off, set M0 = On to disable the adjustment on PT conversion curve. Write K1
(H’1) into CR#40 b0=1 to disable
CH1 set value changing
5. Program example
Ladder diagram: Explanation:
Set CH1 as mode 0 (PT100 mode)
Set the Offset value of CH1
X0
M0
X1
K0 K40
K1
K0
K1TOP
K0 K1
M0
TOP
TOP
X1
SET
H0
K20
H1
K2
K28
Disable CH1 set value changing
4.8 Applications
4.8.1 PT100 Temperature Measurement System
1. Description
 Measuring temperature by PT100 temperature sensor.
2. Devices
 M0: set the average times.
 M1: switch the temperature unit of average and present temperature
 D20 ~ D23: average Celsius temperature at CH1 ~ CH4
 D30 ~ D33: average Fahrenheit temperature at CH1 ~ CH4
DVP-ES2 Module Manual
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