AS Series CPU supports upto 16 Extension Module (Analog I/O Module, Temperature Measurement Module, Communication Module) AS0RTD-A is 04 CH Temperature Measurment Module. 04 CH RTD Inputs,Pt100,Ni100,Pt1000,Ni1000,JPt100,LG-Ni1000,Cu50,Cu100,Removable TB,0.1ºC Resolution