How do I read digital input status of PLC S7-200 smart on ethernet communication from by VB program?

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Hello Experts,
I am conversant with PLC programming but I am developing a PC interface wherein I am required to read status of Digital Inputs for further processing.
I need help in establishing Ethernet communication between Siemens S7-200 Smart PLC and my windows application (Which I will develop in Visio Studio-2012).
Please ask for additional details.
I am Eager to receive some suggestion for this.

What I have tried:

So far I have tried some free program library like libnodave and SNAP7 but have not succeeded.

Posted 1-Nov-16 6:19am

Sushil Mishra

Updated 2-Nov-16 1:28am

Sean Ewington

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[no name] 1-Nov-16 12:25pm

What help do you need or expect from us? What did the manual say for your PLC? What did the technical support people say when you asked them?

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Richard MacCutchan · Answer 1 · 2016-11-01T06:26:00

Solution 1

You need to study the device documentation to check what protocol it supports. you can then use the relevant .NET class to connect.

Posted 1-Nov-16 6:26am

Richard MacCutchan

Comments

Sushil Mishra 1-Nov-16 22:52pm

Protocol is Profinet.

Richard MacCutchan 2-Nov-16 4:41am

Is that supposed to mean something?

Ralf Meier 2-Nov-16 7:32am

@Richard:
No ... that means nothing. ProfiNet is a bus-protocol based on EtherNet.
The problems of the OP come from the handling (or not-handling) of the library he uses.
So originally the text of your answer had better be : "you need to study the documentation of the LibNoDave-Library ..." - but in sum you are right ...

Richard MacCutchan 2-Nov-16 7:38am

I know that. I was just trying to prompt the OP to think about his/her problem, rather than posting vague messages.

Ralf Meier · Answer 2 · 2016-11-02T01:28:00

The LibNoDave-Library nowadays is much improved by a guy named "Jochen Kuehner". He also made a lot of samples to work with it.
If you want more Information you should post this question in the German PLC-Forum www.SPS-Forum.de.
Here you could also contact Jochen Kühner for more Information.

But also there is much more Information about your code (and so on) required.