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100

101

PLC programming

Library

FILE IO functions

8.8

8.8.3

384

EDSTCXN EN 2.0

8.8.3.3 SetCurrentPath

FUNCTION SetCurrentPath: DINT

VAR_INPUT

path_s : STRING(40); (* device name and path *)

END_VAR

Defines the actual default drive and the directory path for the file IO

functions of the device drivers (¶ 390). With the directory path the IP

address of the CNC data server (network disk) can be defined.

Return value: The function returns an error code (¶ 391).

SetCurrentPath(’ND:172.16.5.66’);

8.8.3.4 SYSOPENFILE

FUNCTION SYSOPENFILE : DINT

VAR_INPUT

filename_s : STRING(15);

accessmode_di : DINT;

END_VAR

The function is used to open a file on the defined device (¶ 390). It returns

a file handle which is required for the functions SysReadFile() and

SysWriteFile(). A total of 4 files can be opened simultaneously.

filename_s: Name of the file to be opened. Optionally with preceding device ID and

colon.

accessmode_di: Access mode O_RDONLY or O_WRONLY (defined in gobal constants)

Return value: file handle (greater or equal to 0 if successful, less than 0 in

case of an error (¶ 391).

handle_di : DINT;

handle_di := SYSOPENFILE(’RD:data.dat’, O_RDONLY);

Declaration

Description

Example

Declaration

Description

Parameters

Example

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Lenze ETC Motion Control Manuale Utente Pagina 384

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