6 - 10 6 - 10
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.
Содержание A1SD51S
Страница 183: ...11 13 11 13 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS RUN Before swap A 0 H924 A 1 H1159 After swap A 0 H1159 A 1 H924 OK...
Страница 331: ...11 161 11 161 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the CON ON OFF STOP and ZOPEN functions and Section 7 4...
Страница 557: ...11 387 11 387 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the CHR SPACE and SPC functions...
Страница 629: ...11 459 11 459 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the ZOPEN ZSEND and ZCNTL instructions and Section 7 3 4...
Страница 645: ...11 475 11 475 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the ZEVENT ZSIGNAL and DEF ZEVENT instructions...