The wiring-saving module includes: industrial relay module board, I/O module and transfer module board, standard connection interface board. They can expand flexible on different types of CNC and PLC development boards. The fixed screw holes and DIN35/C45 guide rail can faster the installation and easy to replace. Saving the space, convenient wiring and shortening the set up time. Also reducing human errors, and the defect rate can lower by more than 50%. The independent wiring of the contacts and the protection devices are available. The less the wiring, the fewer the failure points. Thus, the parts can extend the mechanical life and electrical life longer. The module boards maintain easily, to achieve the electrical control and production cost-saving.