Mitsubishi Electric MELSEC IQ-R series Reference Manual page 293

Programmable controller
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Drive name
A data to perform reading usage status of drive memory, or specify the QnACPU drive to perform defragmentation.
■Data communication in ASCII code
Convert the numerical value that indicates access target drive to 4-digit ASCII code (hexadecimal), and send it from the upper
digits.
■Data communication in binary code
Send 2-byte numerical values that indicate access target drive from the lower byte (L: bits 0 to 7).
■Specified content of drive name (Other content cannot be specified.)
Setting value
0000H
0001H
0002H
0003H
0004H
000FH
Cluster No.
A data to specify the first cluster No. within the range of drive memory whose usage status is to be read. Specify the data in
multiples of 16 (00H, 10H, 20H... in hexadecimal notation).
■Data communication in ASCII code
Convert the cluster No. which is higher than '00H' to 4-digit (hexadecimal) ASCII code, and send it from the upper digits.
■Data communication in binary code
Send 2-byte numerical values that indicate cluster No. which is higher that '00H' from lower byte (L: bits 0 to 7).
■Drive memory defragmentation
When performing defragmentation of drive memory, specification of the cluster No. is not required.
Number of clusters to be read
A data to specify the number of clusters within the range of drive memory whose usage status is to be read. Specify the data
in multiples of 16 (10H, 20H... in hexadecimal notation).
■Data communication in ASCII code
Convert the number of clusters '10H' to '100H' (16 to 256) to 4-digit ASCII code (hexadecimal), and send them from the upper
digits.
■Data communication in binary code
Send 2-byte numerical value that indicates the number of clusters from '10H' to '100H' (16 to 256) from lower byte (L: bits 0 to
7).
■Drive memory defragmentation
When performing defragmentation of drive memory, specification of the number of clusters to be read is not required.
Specify the number of clusters to be read within the range of the usable memory size after formatting the drive
to be read from.
• Number of clusters = Usable memory size/Number of bytes in one cluster (4096 or 512)
For the number of bytes in one cluster, refer to the following section.
Page 289 Defragment drive memory
Target drive
Internal memory (built-in RAM)
RAM area of memory card A
ROM area of memory card A
RAM area of memory card B
ROM area of memory card B
Drive that the parameter files currently used (specified with the QnACPU dip switch) is stored.
15 QnACPU DEDICATED COMMANDS
15.2 Defragmentation of Drive Memory
15
291

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