vb.net - Troubles to connect to Siemens S7 probably cause of bad protocol used -

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i encounter many troubles connect plc, that, use libnodave library.

here last informlations got : cpu 412-2 communication : cp 443-1

so far, manage connect automaton, but, if use - usertransport protocol, programs crashes when try read datum - isotpc or mpi protocols, can't connect plc ...

so far, code isn't different 1 : http://www.automation-sense.com/medias/images/source-code-and-example-visual-basic-libnodave.jpg

in case, port number 25, rack value 0 , slot value 3.

what may suggest me do?

thanks


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