Mitsubishi Electric · MELSEC-Q/L Common Instruction
This fault indicates that the drive number or file name specified in the (S1) or (S2) parameter of an instruction (such as PSWAPP) does not exist in the PLC memory or the specified storage location. This means the instruction cannot locate the required program file to perform its operation, leading to a failure in file manipulation or program execution.
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Verify the drive number specified in (S1) or (S2) matches an existing and accessible drive in the PLC.
Confirm the exact spelling and case sensitivity of the file name specified in (S1) or (S2) against the actual file name in storage.
Check the PLC's file system or memory card contents via the programming software to ensure the specified file physically exists in the correct drive.
Ensure the file is not corrupted and can be accessed independently.