完全破坏使控制系统无法正常工作，甚至损坏集成电路。
In numerical control system, the peripheral circuits contains contactor, relay, and motor. The ultimate object of the motor system is to control the transient-absorption between contactor and relay contact, causing serious disturbance to the control system, and leading the whole system to waveform distortion due to the spark and arc caused by contact.when the contact open and close, it happens to High-voltage spark, dama