CX3G/FX3GC PLC Programming manual
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by M8039 (version 26232 and above).
AD4
(Environment temperature)
When the analog input has a thermocouple type, it can only do up to 15 channels,
of which AD4 is the ambient temperature of the thermocouple. 16 channels are
possible without the thermocouple type.
The value of the thermistor NTC is read in the 16 registers starting at R23660.