Mitsubishi Electric MELSEC IQ-R series Reference Manual page 301

Number of requested file, total number of registered files, number of file information
A data that indicates the number of request files, number of files registered in the specified drive, and number of files that
return file information when reading file information.
■Data communication in ASCII code
Convert the numerical value described in the reference section relevant to the corresponding function to 4-digit ASCII code
(hexadecimal), and send it from the upper digits.
■Data communication in binary code
Send the 2-byte numerical value described in the reference section relevant to the corresponding function from each low byte
(L: bits 0 to 7).
File name, extension, and attribute
■For file name, extension, and storage location that can be specified
For file name, extension, and storage location of files that can be specified in CPU modules, refer to the user's manual
(function explanation, program fundamentals) of the CPU module used.
Files not described in the user's manual (function explanation, program fundamentals) of the CPU module
used may also be shown for file control. Do not access them since they are for the system use.
■When creating files or changing the file names
When creating a new file or changing the file name, specify the file name (up to 8 characters) and extension (3 characters) in
accordance with the file naming rule of Engineering tool.
■File name, extension
For QnACPU, specify the file name by a file name + extension.
Item
File name
Extension
Ex.
When the file name is 'ABC.QPG'
File name: ABC QPG ( indicates a space)
■Attribute
Add an attribute a file.
Specify the attribute with 1 byte.
Specify '20H' as an attribute value (disk files that can be read/written) at a new file creation and when a dummy is specified.
When the attribute of the created file is not changed, the attribute of readable/writable disk file will be attached.
The attributes for the existing files can be checked using the following functions.
Page 308 Read file information table without header statement (command: 0201)
Page 311 Read file information table with header statement (command: 0202)
The attribute of the created files can be changed between '01H' (Read Only file)  '20H' (readable/writable
disk file).
Page 329 Modify file information (command: 1204)
Specification method
Specify the file name within 8 characters.
If the file name is less than 8 characters, add space (code: 20H) after the file name and fill the characters to 8
characters.
Specify the extension within 3 characters.
15 QnACPU DEDICATED COMMANDS
15.3 File Control
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