I need to read data from Logo FS4 PLC using Visual Studio 2015. PLC as server and .NET as client.

For this I edited a sample program to communicate with Logo.

Communication established. But getting this error while reading data.

PLC config : http://snap7.sourceforge.net/logo.html

Manual under the folder doc from this zip file : 

https://sourceforge.net/projects/snap7/files/1.4.2/snap7-full-1.4.2.7z/download

I used the code provided from here ( err\dot.net\WinConsole\Client )

and the dll file ( err\dot.net\WinConsole\Bin\x64 ) from here.

Solved it. Just a command was missing. Cli_Connect() which connects with the PLC implicitly.

[snip]

New question published by santhosh sundaram is split to a separate thread with the subject Is it possible to read the data in cyclic like a HMI, using snap7?.

Best regards
Jen_Moderator