Chapter 2 SPECIFICATIONS
2 - 5
2.4 I/O Conversion Characteristics
The temperature that the thermocouple detected is input to each channel as a thermoelectromotive force.
Every channel is scanned at every measuring cycle and each input voltage is output as a temperature
conversion value through A/D conversion.
2.4.1 Temperature Conversion Characteristics
The thermocouple input module performs A/D conversion of the non-linear characteristic thermo-
couple input value and outputs the linear-processed temperature conversion value.
The following Fig. 2.1 shows an example of characteristics of the temperature conversion value to
the thermocouple input value.
[Fig. 2.1] Temperature conversion characteristics
2.4.2 Conversion Speed
The conversion speed of the thermocouple input module is 50 ms per channel and its processing is
processed sequentially, that is, one channel is processed and then another channel is processed.
Measuring cycle = 50 ms
×
(the number of conversion enabled channels)
Example) When 10 channels are used in the G3F-TC4A
Measuring cycle = 50 ms
×
10 = 500 ms
That is, at every interval of 500ms, every thermocouple input value of every channel is
A/D converted and output as a temperature conversion value
Characteristics between linearized
temperature and thermoelectromotive force
℃
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