Nj-Series Instructions Reference Manual (W502 - Omron NJ501-1500 Reference Manual

2 Instruction Descriptions
• If a file is open when the operating mode of the CPU Unit is changed to PROGRAM mode or when a
major fault level Controller error occurs, the file is closed by the system. Any read/write operations
that are in progress are completed to the end.
• If a file is open when the power supply it stopped with the power switch, the file is not corrupted.
• If a file is open and the SD Memory Card is removed before the power switch is pressed, the contents
of the file will sometimes be corrupted. Always turn OFF the power supply before removing the SD
Memory Card.
• If a file is open when the power supply is stopped or the SD Memory Card is removed, it will not be
possible to read or write the file even if the SD Memory Card is inserted again.
• An error occurs in the following cases. Error will change to TRUE.
• The SD Memory Card is not in a usable condition.
• The SD Memory Card is write protected.
• There is insufficient space available on the SD Memory Card.
• The file specified by SrcFileName does not exist.
• The value of SrcFileName is not a valid file name.
• The value of DstFileName is not a valid file name.
• The maximum number of files or directories is exceeded.
• The file specified by SrcFileName or DstFileName is already being accessed.
• A file with the name DstFileName already exits and the value of OverWrite is FALSE.
• A file with the name DstFileName already exits and the file is write protected.
• If more than four SD Memory Card instructions that do not have a FileID variable (i.e., FileWrite-
Var, FileReadVar, FileCopy, DirCreate, FileRemove, DirRemove, and FileRename) are executed
at the same time.
• The value of DstFileName exceeds the maximum number of bytes allowed in a file name.
• An error that prevents access occurs during SD Memory Card access.
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NJ-series Instructions Reference Manual (W502)