Lenze ETC Motion Control Manual de usuario descargar pdf (Pagina 385)

100

101

PLC programming

Library

FILE IO functions

8.8

8.8.3

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

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ama 11 Jan 2025 | 19:35:39

rasha

Lenze ETC Motion Control Manual de usuario Pagina 385

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