Help with s7 and C# application

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Hi there,

I have to develop simple application which will connect to Simatic 300 and recieve the data from it (Format data block from screen shot in configuration panel is -> DB29 and lenght = 32)

Im using for it library libnodave but Im new in this area of knowlege so I have few questions.

1. I made connection to PLC VIA TCP (.opensocket (102.IP))

2. I recieve simple data using dc.readybytes(daveDB,29,0,32,buffer) but the resoults are like some numbers ( I believe there are bytes). What I need to do with it know ? Im trying to encode it using System.Text.Encoding.ASII.getString(buffe) but there is nothing in there...

3. My application has to work all the time, and in each x minutes has to check if the data are from the PLC, which is the best way to do it ? Using thread and loop while() is good one ?

4. If I want to recieve data from PLC what I need to know ? Do I need to send any information to PLC for start recieve data ??



Please help.

Regards
Emil

 

[vierlagig]

2. the library have some functions, also the function getbyte or getreal ... you have to know, what type the value have you want to get ...

3. do never use a loop for this stuff. set a timer with 60s ... you will find some help here:

Timer t1 = [COLOR=#0000FF]new[/COLOR] Timer(); [COLOR=#008000]// make a timer[/COLOR]
t1.Interval = 100; [COLOR=#008000]// set the time, here 100ms[/COLOR]
t1.Tick+=[COLOR=#0000FF]new[/COLOR] EventHandler(t1_Tick); [COLOR=#008000]// set the thread[/COLOR]
t1.Start(); [COLOR=#008000]// start the timer[/COLOR]

[COLOR=#0000FF]void[/COLOR] t1_Tick([COLOR=#0000FF]object[/COLOR] sender, EventArgs e)
{
[COLOR=#008000]// this code will be execute every timer tick[/COLOR]
}

4.you have to open the connection and send (with the right function, s.a. 2., the position) to get the data ...


... the libnodave library involved a .net, i think a c# sample ... just read it