Hi Developers,

For testing purposes I need to open a file while my application is running in using .

The file is in the same folder of the project *.pro but always returns 0.

Is it possible to open a file or I need to be connect on a real target?

Best regards

Daeio

Hi

Sorry, but the SysFileLib functions do not work in Simulation mode.

Best regards

Erik

Hi,
i would wanna know if you can show me some e.g. for syslibfile.. i understand that not work on online mode... wherever, i wanna be sure about how to use it because i need create a file for store a value from a variable. and a need writte the value into a .txt... thanks.. can you help me? i'm sorry for my english.

Originally created by: Mikhail Shvetsov

If i understood you correctly, the examples below can help you. But this example is on Russia, but you can use Google-translate, or look at code. It's pretty understandable. There are too much explanations, but you need part below line "*" after fig 3.
http://forum-ru.3s-software.com/viewtop ... 1584#p1584 m

Hi
Did you read the CoDeSys documentation to SysLibFile ?
Everything you need is described there.

Erik

excuse me but, if i use OPC server it's not easier? the example in russ is so good!. but, does not work...

What do you want ?
Write into a .txt, or use OPC ?
Thats 2 different things...
Writing in a file is very easy.

Erik

I really want to get the value from a global variable of codesys, then to safe that values into a .txt file; but i don't know if using OPC would be easier for that, that was my question about OPC. but, please if you can help me to make that, i will be thankful.

Try this:

FUNCTION_BLOCK WriteValueToFile_FB
VAR_INPUT
strFileName: STRING(255);
strDataBuffer: STRING(255);
END_VAR
VAR_OUTPUT
bDone: BOOL;
bError: BOOL;
wErrorID: WORD;
END_VAR
VAR
dwBytesWritten: DWORD;
dwFileWrite: DWORD := 0;
END_VAR

dwFileWrite := SysFileOpen(FileName:=strFileName, Mode:='a');

IF dwFileWrite = 0 THEN (error: file couldn't be opened )
bError := TRUE;
wErrorID := 1;
RETURN;
END_IF

dwBytesWritten := SysFileWrite(File:=dwFileWrite, Buffer:=ADR(strDataBuffer), Size:=LEN(strDataBuffer));

IF dwBytesWritten = LEN(strDataBuffer) THEN
bDone := TRUE;
SysFileClose(dwFileWrite);
dwFileWrite := 0;
ELSE
bDone := FALSE;
SysFileClose(dwFileWrite);
dwFileWrite := 0;
END_IF

Thanks for your code. I wonder if the error is due to the way I'm stating the name of the file, because I am stating this: strFileName: STRING (255): = 'c: / data / mylog.txt', the results from strDataBuffer is 0 I think it can be because I'm in simulation mode and I understand that you can have conflicts, have you any idea how to see the results? The PLC I'm using is a MFD4-5-XRC-30. If only work connected with the PC or does will lack the MMC?

strFileName: STRING (255): = 'c: / data / mylog.txt';

the results are:

Hi
As usual, SysLibs do not work in Simulation mode.
There is no Hardware selected, so there are no SysLibs...

Erik

Originally created by: Mikhail Shvetsov

ventas3 hat geschrieben:
excuse me but, if i use OPC server it's not easier? the example in russ is so good!. but, does not work...

All examples were checked out many times by a lot of peoples. Just believe me, i know it:) Theres a lot of peculiarities which isn't showed on figures but explained in text, and you probably miss them. But you can ask me about problem with it.I'll reply.

i attached very simple project (special for you from Russia with love ). This one is written for PLCWinNT. Start the program and change "Start" variable to TRUE.
It write the string WriteBuffer into file on drive "D" (you should fix it if you don't have drive D) and read it to string ReadBuffer.

It works well

WriteReadFile.pro [32.43 KiB]

Originally created by: Mikhail Shvetsov

ventas3 hat geschrieben:
Muchisimas Gracias a todos!... Thank you very much for your help...!..

Да всегда пожалуйста - it means - You are always welcome!