19.9 Common Precautions for SD Memory Card Access Instructions
■
Instruction operation
● At the start of instruction execution, checks are conducted, whether an SD memory card is
inserted or not, if the cover is closed, and whether the card is write-protected or not.
● During execution, the SD memory card access instruction active flag (SR3A) is ON, and the
execution completion flag (SR3B) is OFF.
● During the execution, the SD memory card access instruction active flag (SR3A) is OFF, and
the execution done flag (SR3B) is ON.
● The execution is performed through multiple scans.
● On completion of execution, the SD memory card access instruction execution result flag
(SR3C) turns ON or OFF according to the result, and the execution end code is stored in
system data register SD30.
● Use the execution result flag to judge whether the SD memory card access instruction is
completed normally or abnormally when the execution done flag turns ON. The contents of
errors are stored in system data register SD30.
● Only one SD memory card access instruction can be executed at a time. To execute more
than one instruction, perform exclusive control using flags such as the SD memory card
access instruction active flag.
● If another SD memory card access instruction is being executed when starting an instruction,
the new instruction cannot be executed.
■
Flag operation
Abnormal completion = 1
Normal completion = 0
SD memory card access instruction execution conditions
SR3A
:
:
SD memory card access instruction active flag
SR3B
:
:
SD memory card access instruction done flag
SR3C
:
:
SD memory card access instruction result flag
SD30
:
:
SD memory card access instruction result code
All the above flags and register are set when the instruction is executed.
The completion is announced at the end of scan.
Zero is set.
The end code is set.
The execution is performed through multiple scans.
(Note 1)
However, when errors such as no SD memory card, SD memory card write protected, or improper SD
memory card file name length are detected, the completion is announced at the start of instruction
execution without turning ON the active flag.
■
Error Codes Table
Error code
Description
Cause
Types of detected instructions
and the timing
0
Normal end
1
No SD memory card
No SD memory card is inserted, or
the cover is open.
All SD memory card access
instructions, at the start of
instruction execution
2
SD memory card
write-protected
The SD memory card is write-
protected.
Write, delete, move, copy, and
rename instructions
19.9 Common Precautions for SD Memory Card Access Instructions
WUME-FP7CPUPGR-12
19-21
Содержание FP7 Series
Страница 2: ... MEMO 2 WUME FP7CPUPGR 12 ...
Страница 18: ... MEMO xviii WUME FP7CPUPGR 12 ...
Страница 52: ... MEMO 1 34 WUME FP7CPUPGR 12 ...
Страница 61: ...Example 2 Use PSHS RDS or POPS instruction 2 1 Structure of Instructions WUME FP7CPUPGR 12 2 9 ...
Страница 104: ... MEMO 2 52 WUME FP7CPUPGR 12 ...
Страница 123: ...3 9 ANS AND stack WUME FP7CPUPGR 12 3 19 ...
Страница 125: ...3 10 ORS OR Stack WUME FP7CPUPGR 12 3 21 ...
Страница 129: ...3 11 PSHS Push stack RDS Read stack POPS Pop stack WUME FP7CPUPGR 12 3 25 ...
Страница 139: ...4 CNDE instruction 5 Step ladder instructions 6 Subroutine instructions 3 16 ALT Alternate out WUME FP7CPUPGR 12 3 35 ...
Страница 146: ... Application example of timer instructions serial connection of timers 3 17 TM Timer 3 42 WUME FP7CPUPGR 12 ...
Страница 147: ... Application example of timer instructions parallel connection of timers 3 17 TM Timer WUME FP7CPUPGR 12 3 43 ...
Страница 190: ...3 26 JP LBL Jump Label 3 86 WUME FP7CPUPGR 12 ...
Страница 239: ...Name Description SR8 ER 3 46 ST ST ST ST ST ST Data Comparison Start WUME FP7CPUPGR 12 3 135 ...
Страница 246: ... MEMO 3 142 WUME FP7CPUPGR 12 ...
Страница 251: ...Name Description SRA Depending on the comparison result SRB SRC 4 1 CMP Data Compare WUME FP7CPUPGR 12 4 5 ...
Страница 258: ... MEMO 4 12 WUME FP7CPUPGR 12 ...
Страница 277: ...F E D C B A 9 8 7 6 5 4 3 2 1 0 Digit 3 Digit 2 Digit 1 Digit 0 bit 5 8 DGT Digit Data Transfer WUME FP7CPUPGR 12 5 19 ...
Страница 304: ... MEMO 5 46 WUME FP7CPUPGR 12 ...
Страница 321: ...Name Description ER 6 7 DIVFP2 Division FP2 Compatible WUME FP7CPUPGR 12 6 17 ...
Страница 348: ... MEMO 6 44 WUME FP7CPUPGR 12 ...
Страница 388: ... MEMO 7 40 WUME FP7CPUPGR 12 ...
Страница 438: ... MEMO 8 50 WUME FP7CPUPGR 12 ...
Страница 450: ... MEMO 9 12 WUME FP7CPUPGR 12 ...
Страница 520: ... MEMO 10 70 WUME FP7CPUPGR 12 ...
Страница 602: ... MEMO 11 82 WUME FP7CPUPGR 12 ...
Страница 622: ... MEMO 12 20 WUME FP7CPUPGR 12 ...
Страница 650: ... MEMO 13 28 WUME FP7CPUPGR 12 ...
Страница 1160: ... MEMO 18 66 WUME FP7CPUPGR 12 ...
Страница 1188: ... MEMO 19 28 WUME FP7CPUPGR 12 ...
Страница 1211: ...20 4 ASCII Code Table JIS8 Code Table Reference Table ASCII Codes 20 4 ASCII Code Table JIS8 Code Table WUME FP7CPUPGR 12 20 23 ...
Страница 1220: ... MEMO WUME FP7CPUPGR 12 ...
Страница 1221: ... MEMO WUME FP7CPUPGR 12 ...