Coil cable has a very good stability. It plays a very important role in the control system, and also brings great convenience to the operation of the control system, greatly increase the stability and efficiency of the work. Usually the coil cables are applied for machine tools, and assembly line in the industry control system. Sometimes it is also adopted by scientists and inventors to the creation of the new robot manufacture due to its great performance for the robot control connection. To some extent, it accelerates the invention and creation of many new types of machines.