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MELSEC-Q
6 I/O Processing of Data Files
Random File
MEMORY CARD
• Always execute the CLOSE instruction after data input/output is complete.
• After the CLOSE instruction is executed,
input/output operation can no longer be performed in the file.
Furthermore, input/output operation cannot be performed in the file buffer.
3)" Read the data into the file buffer using the GET instruction if data is to be read.
File buffer
Data
File Buffer
CLOSE #n
G E T
D1#= CVD ( A$) • • • • • • • •
X1$= B$
The numeric data is converted back to numeric
data using CVI, CVS, or CVD function.
G E T # n , < r e c o r d n u m b e r >
Read the data in the file buffer to variables.
4) Close the file.
