Self-diagnosis of the CNC system in CNC machine tools

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　　Modern CNC machines, thanks to the use of computer technology, have powerful software capabilities; combined with the appropriate hardware, they possess strong self-diagnosis abilities. 　　1. Power-on self-diagnosis 　　When the CNC system is powered on, it runs a power-on self-diagnosis program to check all the connected control devices. Any issues detected are reported immediately; for example, it checks whether the voltage of the backup battery meets the required level. If the voltage is too low, the system issues an alarm. In Siemens systems, this type of battery-related alarm is indicated by alarm code i, signaling to maintenance personnel to replace the battery right away. If the battery cannot be replaced, the power must not be turned off until the battery is replaced. 　　2. Run self-diagnosis 　　While the CNC machine is in operation, the CNC system continuously monitors its performance. The CNC unit monitors the operation of the servo system and PLC system; it issues alerts promptly if any problems are detected, and warning messages for many faults are displayed on the screen. While the machine tool is in operation, the PLC unit monitors the performance of the CNC machine tool in real time through the user programs developed by the machine tool manufacturer. If any faults are detected or if commands issued are not carried out, the corresponding signals are sent to the CNC unit, which then displays alert messages on the screen.