1, Deterministic failure   

Deterministic failure refers to the control system host hardware damage or as long as certain conditions are met, CNC machine tools are bound to fail. This type of failure phenomenon in the most common CNC machine tools, but because it has a certain pattern, so it also brings convenience to the maintenance of deterministic failures with non-recoverability, once the failure occurs, such as its maintenance treatment, the machine will not automatically return to normal. But as long as the root cause of the failure to find out, maintenance can be completed immediately after the machine back to normal. Correct use and careful maintenance is to eliminate or avoid the occurrence of failure of important measures.

2, Random failure   

Random failure refers to CNC machine tools in the working process of accidental failure of such failures occur more hidden reasons, it is difficult to find out its regularity, it is often referred to as "soft failure", random failure cause analysis and troubleshooting is more difficult, in general, the occurrence of failures is often associated with the quality of installation of components, parameter settings, Generally speaking, the occurrence of faults is often related to the installation quality of components, parameter setting, quality of components, poor software design, the influence of the working environment and many other factors. Random faults have recoverability, after the fault occurs, through the reboot and other measures, the machine tool can usually be restored to normal, but in the process of operation, the same fault may occur again.

Strengthening the maintenance and inspection of the CNC system to ensure the sealing of the electrical box, reliable installation, connection, proper grounding and shielding is an important measure to reduce and avoid the occurrence of such failures.