Ny-Series Instructions Reference Manual (W560 - Omron NY532-5400 Reference Manual

2 Instruction Descriptions
• The number of array elements in ReadBuf[] is smaller than the value of Size.
• The SD Memory Card is not in a usable condition.
• The file specified by FileID does not exist.
• The file specified by FileID is being accessed.
• The file specified by FileID was not opened in a reading mode.
• An error that prevents access occurs during SD Memory Card access.
Sample Programming
In this sample, four bytes of data are read from the second byte from beginning of the file named
'ABC.bin.' The data is written to BYTE array variable InDat[]. The processing procedure is as follows:
1
The FileOpen instruction is used to open the file 'ABC.bin.'
2
The FileSeek instruction is used to set a file position indicator at the second byte from the begin-
ning of the file.
3
The FileRead instruction is used to read four bytes of data from the position of the file position
indicator and store it in array variable InDat[].
4
The FileClose instruction is used to close the file 'ABC.bin.'
LD
Internal
Variables
External
Variables
2-1268
Variable
OperatingEnd BOOL
Trigger BOOL
Operating BOOL
Fid DWORD
ARRAY[0..999]
InDat
OF BYTE
RS_instance RS
FileOpen_instance FileOpen
FileSeek_instance FileSeek
FileRead_instance FileRead
FileClose_instance FileClose
Variable
_Card1Ready
Data type Initial value
FALSE
FALSE
FALSE
16#0
[1000(16#0)]
Data type Comment
BOOL SD Memory Card Ready Flag

NY-series Instructions Reference Manual (W560)

Comment
Processing completed.
Execution condition
Processing
File ID
Read data