Omron NX-series CPU Unit

An error was detected in the DIP switch setting of the PLC Function Module. This fault is detected at power ON or Controller reset, indicating an incorrect configuration. When this error occurs, both the user program and overall CPU Unit operation will stop, requiring a power cycle to recover.

A fatal error was detected on the internal bus of the PLC Function Module. This issue is continuously monitored and indicates potential hardware failure or interference. If this error occurs, the user program and CPU Unit operation will stop, and connection to the Sysmac Studio may not be possible. A power cycle is required for recovery.

The specified number of deletions for the non-volatile memory in the CPU Unit has been exceeded, or the number of bad blocks in memory has surpassed the specified value. This indicates that the non-volatile memory life has expired, suggesting degradation of the memory component.

An error was detected in the memory check of the main memory in the CPU Unit's PLC Function Module. This error is continuously detected, indicating a major fault level, and will stop user program execution and controller operation.

An error was detected during the non-volatile memory check, leading to file system recovery or formatting. This action may result in the deletion of previous files. This typically occurs due to power interruptions during memory access.

An error was detected during the memory check of the main memory in the CPU Unit's PLC Function Module. This fault is continuously monitored and indicates a critical issue with the CPU's primary memory. Both the user program and overall CPU Unit operation will stop upon detection, requiring a power cycle to recover.

A critical file required by the Controller, stored in non-volatile memory, is either missing or has become corrupted. This error is detected at power-on or during a Controller reset, leading to a major fault level that stops both the user program and Controller operation.

The event level setting file contains incorrect or corrupted data. This error is detected at power-on or during a Controller reset, resulting in a major fault that stops the user program and Controller operation.

The user program execution ID configured in the user program does not match the ID set in the CPU Unit. This error is detected during user program download, power ON, or Controller reset. When this mismatch occurs, the user program and CPU Unit operation will stop, requiring a power cycle or Controller reset to clear the fault.

Saving the event log failed in the PLC Function Module. This error is detected at power ON or Controller reset, categorized as an observation level error. User program execution is not affected, but part or all of the past event log cannot be read.

The user program is not correctly structured or exceeds system limitations. This error is detected during program download, power ON, or Controller reset. If this fault occurs, the user program will stop, and the CPU Unit's operation will also cease, requiring a power cycle or Controller reset for recovery.

The power supply was interrupted while transferring the trace settings in the PLC Function Module. This error is detected at power ON or Controller reset, categorized as an observation level error. User program execution continues, but all trace settings are initialized.

A fatal error was detected in the PLC Function Module. This error is continuously detected, indicating a major fault level. User program execution and controller operation will stop immediately.

A fatal error was detected in the PLC Function Module. This error is continuously detected, indicating a major fault level. User program execution and controller operation will stop immediately.

A fatal error was detected in the PLC Function Module, making a connection to the Sysmac Studio impossible. This error is continuously detected, indicating a major fault level, and will stop user program execution and controller operation.

A fatal error has been detected within the PLC Function Module, indicating a critical software malfunction. This error leads to a partial fault level. The user program will stop, and the controller operation will cease.

A fatal error was detected in part of the PLC Function Module. This is a minor fault level error, meaning the user program continues to run, and overall operation is not affected.