LSIS XBF-AD08A - Page 152

Chapter 5 Thermocouple Input Module (XBF-TC04S,TC04B)
5.3.2 Scaling function
Thermocouple input module has a function to scale value in user-defined range besides temperature
display.
The scope is classified into two types; 16 bits data type, -32768~32767 and 16 bits data type without
mark, 0~65535.
If a user selects one of these two types and sets the range, it displays the temperature through scaling
operation.
Scaling data type Scaling min. value Scaling max. value
Signed value -32768 ~ [Scaling max. value -1] [Scaling min. value+1] ~ 32767
Unsigned value 0 ~ [Scaling max. value-1] [Scaling min. value+1] ~ 65535
The following graph indicates relation between scaled value and temperature input.
Scaling operation:
0Y)0XX(
)0X1X(
)0Y1Y(
Y +−
−
−
=
X = Temperature value
X0 = Thermocouple measurement min. temperature value
X1 = Thermocouple measurement max. temperature value
Y0 = Scaling min. value
Y1 = Scaling max. value
Y = Scaling
Ex.) If scaling with mark is set with -2000 ~ 13000 and the temperature measured K type sensor is
500.0 ℃, the value scaled is as follows.
• Scaling conversion value
5000)200())200(500(
))200(1300(
))2000(13000(
=−+−−
−−
−−
=
-2000
-200.0
Temperature
value
Scaling
Conversion
value
1300.0
13000
5000
500.0
X
X1
X0
Y0
Y
Y1
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