Mitsubishi Electric MELSEC System Q/L Series

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise, a hardware fault, or (for Universal model QCPU) accessing outlying devices with device range checks disabled (SM237 = 1) during BMOV, FMOV, or DFMOV instruction execution. This error specifically affects QCPU and LCPU modules.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise or a hardware fault. For Qn(H), QnPH, and QnPRH models, this error can also occur if a boot operation was performed without formatting the program memory.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

An error is detected due to an out-of-specification voltage waveform applied to the power supply module, or a failure in critical hardware components. This includes the power supply module, CPU module, main base unit, extension base unit, or extension cable. In redundant systems, failure of both redundant power supply modules or the redundant base unit can also trigger this error.

The entire program was executed without the proper execution of an END instruction. This issue can arise if the END instruction is misread due to electrical noise or if it has been inadvertently changed to another instruction code.

The SFC (Sequential Function Chart) program cannot be terminated normally. This issue may be caused by electrical noise interference or other unspecified reasons preventing the SFC program from concluding its execution sequence.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

The CPU module has experienced a runaway condition or failure, potentially due to electrical noise interference or a fundamental hardware fault within the module. This condition indicates the CPU is no longer operating correctly.

The CPU module, specifically its built-in I/O, has experienced a runaway condition or failure. This can be caused by electrical noise interference or a fundamental hardware fault within the CPU module. The condition indicates that the CPU is not operating correctly.

The sequence program storing program memory within the CPU module is faulty. This diagnostic occurs during power ON, after a reset, or upon execution of an END instruction, indicating an issue with program integrity.

The work area RAM in the CPU module, or the standard and extended RAM areas, are faulty. This diagnostic occurs at power ON, after a reset, or when an END instruction is executed.

The device memory in the CPU module is faulty. This can also occur if a device address outside the valid range is accessed due to indexing, potentially overwriting system device memory. This diagnostic occurs at power ON, after a reset, or upon execution of an END instruction (for specific Qn(H) series models).

The address RAM in the CPU module is faulty. This diagnostic occurs at power ON or after a reset of the CPU module.

The CPU memory in the CPU module is faulty. This indicates a problem with the main processing unit's internal memory. This error is typically detected at power ON or during a system reset, pointing to a potential hardware malfunction within the CPU module.

The program memory in the CPU module is faulty. This error is detected during a STOP to RUN transition or when an END instruction is executed, indicating an issue with the stored program logic.

A tracking hardware fault was detected during running in the redundant system. This indicates an issue with the hardware responsible for tracking system status, potentially compromising redundancy.

The memory of the CPU module in the Multiple CPU high speed transmission area is faulty. This indicates a problem with memory designated for inter-CPU communication in high-speed multi-CPU systems, affecting data exchange.

The program memory in the CPU module is overwritten. This suggests an integrity issue with the stored program, potentially due to incorrect writes or memory corruption during program execution.

The data of the device memory built in the CPU module is overwritten. This indicates a corruption or unintentional modification of data within the CPU's internal device memory.

Data in the program memory of the CPU module were overwritten. This fault occurs when an instruction is executed, indicating an integrity issue with the program memory that stores application logic.

The destruction of the data stored in the standard RAM is detected. This error occurs when an instruction is executed, indicating a potential issue with the integrity of data in the CPU's standard memory area.

The RAM of the CPU module (built-in I/O) is faulty. This error indicates a hardware problem with the internal memory specifically allocated for built-in I/O functions within the CPU module. It can occur at any time.

The RAM of the CPU module (built-in I/O) is faulty. This error indicates a hardware problem with the internal memory specifically allocated for built-in I/O functions within the CPU module. It is detected at power ON or during a system reset.

In a multiple CPU system, a CPU module incompatible with the multiple CPU system is mounted. This means an incorrect CPU type has been installed in the main base unit, preventing proper system operation. Alternatively, it could be a self-diagnostic error in the system bus or CPU module, or a mismatch in the control CPU setting for other CPUs compared to CPU No.1.

A fault of a loaded module was detected, or in a multiple CPU system, a CPU module incompatible with the multiple CPU system is mounted. This indicates an issue with an installed module or an incorrect CPU type, affecting system operation.

An error is detected on the system bus. This indicates a communication or integrity issue within the system's internal data highway. It can also signify a fault of the main or extension base unit.

An error of the host CPU is detected in the Multiple CPU high speed bus. This indicates a communication or hardware issue originating from the primary CPU within a multi-CPU high-speed communication network, potentially affecting inter-CPU data exchange.

A communication error with another CPU is detected in the Multiple CPU high speed bus. This suggests an issue preventing proper data exchange between CPU modules in a high-speed multi-CPU system, impacting coordinated operation.

A communication timeout with another CPU is detected in the Multiple CPU high speed bus. This means that a CPU module failed to respond within an expected timeframe during communication on the high-speed bus, indicating a delay or disconnection.

A communication error with another CPU is detected in the Multiple CPU high speed bus. This indicates an issue preventing proper data exchange between CPU modules in a high-speed multi-CPU system, impacting coordinated operation.

An error of the Multiple CPU high speed main base unit is detected. This also signifies an error of the Multiple CPU high speed bus, indicating a problem with the physical chassis or the high-speed communication backbone.

An error of the Multiple CPU high speed main base unit is detected. This also signifies an error of the Multiple CPU high speed bus, indicating a problem with the physical chassis or the high-speed communication backbone.

An error of the Multiple CPU high speed main base unit is detected. This also signifies an error of the Multiple CPU high speed bus, indicating a problem with the physical chassis or the high-speed communication backbone.

An error of the multiple CPU high speed main base unit was detected. This refers to an error of the multiple CPU high speed bus, indicating a problem with the physical chassis or the communication backbone in a multi-CPU system.

An error of the multiple CPU high speed main base unit was detected. This refers to an error of the multiple CPU high speed bus, indicating a problem with the physical chassis or the communication backbone in a multi-CPU system.

A momentary power supply interruption has occurred. This indicates a brief loss or sag in the incoming AC power supply, which can affect the stability and operation of the CPU.

This error indicates an incorrect layout or excessive configuration of special units (modules) on the base unit. It occurs when the number of connectable modules exceeds 10, when a module causes total I/O points to exceed 4096 (for L26CPU-BT) or 1024 (for L02CPU), or if a module is installed across an I/O point boundary. This fault results in the CPU stopping operation.

This error occurs when an intelligent function module or special function module is installed but is either not recognized by the CPU (QCPU/LCPU) or fails to respond. This suggests a compatibility issue, incorrect module type, or a hardware fault within the module itself. The error is diagnosed at power ON or reset and will cause the CPU to stop.

This error occurs in multiple CPU systems due to incorrect placement of CPU modules. It is triggered by empty slots existing between a QCPU and another QCPU or motion controller. Additionally, mounting any module other than a High-performance model QCPU/Process CPU (including motion controllers) to the left of a High-performance model QCPU/Process CPU will also cause this error. The CPU will stop operation.

This error indicates that an unusable module is mounted on an extension base unit within a redundant system (QnPRH with serial No. 09012 or later). This suggests an incompatibility or an incorrect module type for the specific redundant system configuration. The error is detected at power ON or during a reset, causing the CPU to stop.

The communication processing buffer has run out of space, preventing further communication. This typically occurs due to consecutive reception of request messages using the MC protocol or when received data is not read promptly, causing the buffer to overflow.

The connection to the target device was disconnected prematurely, either before sending a response using the MC protocol or during ongoing communication. This error can sometimes be a symptom of other underlying communication issues, such as a buffer overflow (4184H).

An abnormality was detected in the argument data within the Operating System (OS). This indicates a system error that could stem from improper installation of hardware, an unsuitable operating environment, insufficient power supply, or a hardware failure of the CPU module itself.

This error indicates a system shutdown in a multiple CPU configuration due to a CPU error in a module where 'All station stop by stop error of CPU' is selected. It can also occur if an incompatible CPU module is mounted, or if CPU modules other than CPU No.1 are removed or reset during operation. This fault results in the multiple CPU system stopping.

This fault signifies a failure in the initial communication process between CPU modules in a multiple CPU system. It is triggered by a lack of response from a target CPU module or the presence of an incompatible CPU module within the system. The error occurs at power ON or reset, causing the multiple CPU system to stop.

This error indicates a lack of response from a target CPU module during the initial communication stage within a multiple CPU system. This diagnostic occurs at power ON or reset. If this error persists after basic troubleshooting, it suggests a potential hardware fault within one of the CPU modules. The system will stop.

This fault indicates a data error occurring during communication between CPU modules in a multiple CPU system. It can be caused by issues in the system configuration, such as exceeding the allowed number of I/O points, or by a hardware fault within a CPU module. The error is always monitored and will lead to the CPU stopping.

This error signifies a change in the status of an I/O module from its initial power-on state. The register D9116/SD1116 stores a bit pattern indicating the specific module number (in units of 16 points) with the verification error. This verification is conducted on I/O modules located on remote I/O stations. If the normal status is restored, the error is not automatically cleared and requires a user program to clear it.