Panasonic FP7 Series Command Reference Manual page 1183

19.9 Common Precautions for SD Memory Card Access Instructions
Max. file size
Max. number of files (8.3 format): Root
directory
Max. number of files (8.3 format): Sub
directory
Max. number of files (long format): Root
directory
Max. number of files (long format): Sub
directory
Items
Long file name
File name/Directory name
■
Common precautions
● Error flags are not cleared even when normal arithmetic operations are performed. Use ERR
instruction for clearing error flags.
● An SD memory card access instruction cannot be executed when another SD memory card
access instruction is already being executed. Do not execute the SD memory card access
instruction until the active instruction is complete.
● It may take several scans for the processing to complete.
● Use in an interrupt program is not possible.
● Character string data is set in the order of number of characters then character data.
S
S+1
S+2
S+3
S+4
・・・
Byte address
<Example> When specifying 5 for the number of characters, and "ABCDE" for
character data
DT0
DT１
DT2
DT3
DT4
Byte address
● Include the extension in the file name specification.
WUME-FP7CPUPGR-12
No. of characters
Char.2( byte 1)
Char.1(byte 0)
Char.4(byte 3) Char.3(byte 2)
Char.6(byte 5) Char.5(byte 4)
Char.8(byte 7)
Char.7(byte 6)
・・・
High Low
5
"B"
"A"
"D" "C"
"E"
High Low
SD
2GB
512
65534
170
56634
Description
256 bytes for full path (when specifying route with \. It is 255
bytes when omitting route\.)
ASCII characters (H20 to H7E) / One-byte katakana (HA1 to
HDF)
Japanese (S-JIS code) (H'8140~H'9FFC,H'E040~H'EAA4)
・・・Number of characters stored in character strings
Character data
SDHC
4GB
65535
65534
21845
65534
19-23