Fatek B1-L4NTC Analog I/O Expansion Module

Fatek B1-L4NTC Analog I/O Expansion Module is one of the B1-PLC series analog expansion modules which can support up to 4 channels of NTC thermistor measurement. The measurement is conducted by internally placing a reference voltage with a series resistor to excite the NTC under test. If the temperature is changed then the resistance of NTC is also changed which will also be reflected in the change of the A/D conversion value. By looking up the temperature/resistance characteristic and the A/D value, the user can deduce the measurement temperature.

Features

4 Channels
NTC temperature input module
12-bit resolution
Measuring range 100

Applications

Due to the characteristic of temperature/resistance of NTC and the relation between measurement resistance and A/D value are non- linear, the user should first establish a data table according to the characteristic of applied NTC then apply it in MLC ladder function in order to convert the A/D value back into corresponding temperature.