Switching module (10), comprising: a switching unit (101 to 108), and a determination unit (110) configured to determine a function of the switching unit (101 to 108) and an ON / OFF state of the switching unit (101 to 108), wherein the switching unit (101 to 108) is provided with a plurality of function-determining resistors (R1, R2), and wherein the determination unit (110) is configured to determine the function of the switching unit (101 to 108) according to a combination of voltages applied to the plurality of function determination resistors (R1, R2) corresponding to resistance values of the plurality of function determination resistors (R1, R2), wherein the switching module (10) further includes: a first storage unit (115a) that stores a first correspondence table (Ta1) between resistance value ranges of the plurality of function-determining resistors (R1, R2) and a primary identifier, and characterized by the fact that a second storage unit (115a) which stores a second correspondence table (Ta2) between a combination of a plurality of primary identifiers and an identification ID of the switching unit (101 to 108), wherein the identification ID has a one-to-one correspondence with a function of the switching unit (101 to 108), and wherein the determination unit (110) is configured to read the plurality of primary identifiers from the first storage unit (115a), to read the identification ID corresponding to the combination of the plurality of primary identifiers from the second storage unit (115a) and to determine the function of the switching unit (101 to 108).