Lenze ETC Motion Control - Manual (Page 385)

PLC programming
Library
FILE IO functions
8
8.8
8.8.3
l
385 EDSTCXN EN 2.0
8.8.3.5 SYSCLOSEFILE
FUNCTION SYSCLOSEFILE: DINT
VAR_INPUT
handle_di : DINT;
END_VAR
The function is used to close a file previously opened with SysOpenFile(). The
content of the FLASHPROMs is only updated in the FLASHPROM after the last
file opened for write−access has been closed. The return value of the function
is less than 0 for an error (all error codes are defined in the global constants
of the library).
handle_di File handle (returned by SysOpenFile())
8.8.3.6 SYSREADFILE
FUNCTION SYSREADFILE: DINT
VAR_INPUT
handle_di : DINT; (* File handle returned by SysOpenFile *)
buffer_p : DINT; (* Address of a buffer where the data are stored *)
maxlen_di : DINT; (* Buffer length in byte *)
END_VAR
The function is used for reading blocks (in sequence) from a file previously
opened with SysOpenFile(). A maximum of maxlen_di characters are read
from the file into the buffer defined with buffer_p. Less than maxlen_di
characters will only be read if the file end is reached before or a read error
occurs.
Return value: Actual number of read characters; 0 for file end or less than 0
for error (
¶ 391).
handle_di : DINT;
num_di : DINT;
ret_di : DINT;
buffer_from : ARRAY[0..100] OF BYTE;
handle_di := SYSOPENFILE(’test.dat’, O_RDONLY);
num_di := SYSREADFILE(handle_di, ADR(buffer_from), 20);
ret_di := SYSCLOSEFILE(handle_di);
Declaration
Description
Parameters
Declaration
Description
Example