Mitsubishi Electric MELSEC IQ-R series Reference Manual page 304

Number of bytes read, number of bytes written
A data to specify the number of bytes in the file range from/to which data is read/written. Specify it as one address per one
byte.
■Data communication in ASCII code
Convert the numerical value described in the reference section of the relevant function to 4-digit ASCII code (hexadecimal),
and send it from the upper digits.
■Data communication in binary code
Send 2-byte numerical value described in the reference section of the relevant function from the lower byte (L: bits 0 to 7).
Read data, write data (for batch read and batch write functions)
A data read from or to be written to the file in the CPU module.
■Data communication in ASCII code
Convert one byte (one address) to 2-digit ASCII code (hexadecimal), and send it for the specified number of bytes from the
upper digits.
■Data communication in binary code
Send the specified number of bytes as one byte for one address.
■Data order
• When reading data: Store the data to the external device without changing the order of data read from the CPU module.
• When writing data: Specify the data without changing the order of data read from CPU module.
Write data (identical data write function)
A data for the identical data write function used to wrote the identical data to the existing QnACPU files.
■Data communication in ASCII code
Convert the numerical value for one word to 4-digit ASCII code (hexadecimal), and send it from the upper digits.
■Data communication in binary code
Send the numerical value for one word from the lower byte (L: bits 0 to 7).
Capacity
A data to reserve the file area on the specified disk when registering a new file. Specify the data in the number of bytes.
■Data communication in ASCII code
Convert the numerical value which represents the area for specified file to be reserved in 2 words to 8-digit ASCII code
(hexadecimal), and send it from the upper digits.
■Data communication in binary code
Send the numerical value which represents the area for the specified file to be reserved in 2 words from the lower byte (L: bits
0 to 7).
A new file with the same contents as the existing file can be registered from an external device.
The size of the relevant existing file must be checked using the read file information table function.
Page 308 Read file information table without header statement (command: 0201)
Page 311 Read file information table with header statement (command: 0202)
Page 314 Read file presence (Search file) (command: 0203)
15 QnACPU DEDICATED COMMANDS
302
15.3 File Control