A bracket , comprising a body , the body comprising: a first face provided with a plurality of through holes ; and a second face facing away from the first face and provided with a plurality of accommodating chambers corresponding to the plurality of through holes , wherein the plurality of accommodating chambers is configured to accommodate an input/output module fixedly mounted therein and expose the input/output module from the second face , and the plurality of through holes is configured to expose the input/output module from the first face , wherein the bracket is integrally formed, wherein the plurality of accommodating chambers comprises a first chamber , a second chamber , a third chamber , and a fourth chamber arranged in sequence, wherein the through hole comprises a first through hole , a second through hole , a third through hole , and a fourth through hole , the first through hole is in communication with the first chamber , the second through hole is in communication with the second chamber , the third through hole is in communication with the third chamber , and the fourth through hole is in communication with the fourth chamber , wherein the body comprises a side wall , the side wall connects the first face to the second face , the side wall comprises a top side wall and a bottom side wall facing away from each other, characterized in that centers of the first through hole , the third through hole and the fourth through hole are arranged on a same straight line (L), and the second through hole is arranged between the straight line (L) and the bottom side wall , the top side wall has a notch , the first face has a recess , and the recess is in communication with the notch , wherein the bracket further comprises a bracket positioning column protruding from the bottom of the recess , and the bracket positioning column is arranged between the straight line (L) and the top side wall . a first face provided with a plurality of through holes ; and a second face facing away from the first face and provided with a plurality of accommodating chambers corresponding to the plurality of through holes , wherein the plurality of accommodating chambers is configured to accommodate an input/output module fixedly mounted therein and expose the input/output module from the second face , and the plurality of through holes is configured to expose the input/output module from the first face , wherein the bracket is integrally formed, wherein the plurality of accommodating chambers comprises a first chamber , a second chamber , a third chamber , and a fourth chamber arranged in sequence, wherein the through hole comprises a first through hole , a second through hole , a third through hole , and a fourth through hole , the first through hole is in communication with the first chamber , the second through hole is in communication with the second chamber , the third through hole is in communication with the third chamber , and the fourth through hole is in communication with the fourth chamber , wherein the body comprises a side wall , the side wall connects the first face to the second face , the side wall comprises a top side wall and a bottom side wall facing away from each other, characterized in that centers of the first through hole , the third through hole and the fourth through hole are arranged on a same straight line (L), and the second through hole is arranged between the straight line (L) and the bottom side wall , the top side wall has a notch , the first face has a recess , and the recess is in communication with the notch , wherein the bracket further comprises a bracket positioning column protruding from the bottom of the recess , and the bracket positioning column is arranged between the straight line (L) and the top side wall . <EOS>