Provided is an analog input and output module, the module comprising a first signal processing unit configured to separate analog signal inputted from a plurality of HART transmitters from first HART data, convert the analog signal to digital data, transmit the first HART data to a second signal processing unit, and transmit second HART data received from the second signal processing unit to at least one of the plurality of HART transmitters; and the second signal processing unit configured to control the first signal processing unit and storing conversion result.