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2 Analog I/O Modules
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Thermistor settings
When NTC Thermistor is selected as Signal Type for the FC6A-J8CU1 or FC6A-J8CU4, the following parameters
must be set.
Parameter
R0
T0
B
The characteristic of NTC Thermistor is the resistance decreases as the temperature rises. The analog modules
measure the resistance of the thermistor and calculate the temperature based on above three parameters.
The measurable range of the resistance of NTC Thermistor is 100 Ω to 200,000 Ω. The range of temperature that can
be calculated is -90°C to 150°C. Select NTC Thermistor that functions within those ranges.
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Data
Data refers to the input analog values converted to digital values at the interval of the sampling time.
The data is not guaranteed when the Satus is a value other than "0". For details on when PTC Thermistor
(threshold) is selected as Signal Type, refer to " PTC Thermistor (Threshold)" on page 2-22.
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Status
The status of the analog input Data is stored in data registers.
Status
0
1
2
3
4
5
6
7
8
9
10 to 65,535
*1 Information are described in the instruction sheet for the thermistor to use.
*2 Signal Type is only Expansion 0 to 20mA DC or Expansion 4 to 20mA DC.
*3 Signal Type is Expansion 4 to 20mA DC only.
2-20
Description
The thermistor resistance in "T0" °C (Ω)
*1
Temperature (°C)
*2
Thermistor B constant
Operating normally
Converting data
Initializing
Parameter setting error
Hardware fault (external power supply error)
Wiring fault (out of maximum range error)
Wiring fault (out of minimum range error)
Reserved
When the analog input value is greater than 20 mA and less than the upper limit value
When the analog input value is greater than the lower limit value and less than 4 mA
Reserved
MICRO/I Hardware Manual
*1
0 to 65,535
-32,768 to 32,767
-32,768 to 32,767
Description
Range
*2
*3
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