Hello everyone,

Actually, I'm on a project and I need to read some data from my plc. I'm using c# with the s7.Net library. 

However I have an error. I can make a connection but it's impossible to read any data from datablocks. 

I disable the optimized acces, allows the put/et method. 

If someone can help me, it would be perfect. I send with my post my code et a picture of my example Datablock.

Ps : I'm sorry about my english.

public void connexionplc()

{

Plc plc = new Plc(CpuType.S71200, "192.168.0.1", 0, 1);

plc.Open();

if (plc.IsConnected)

{

var data = plc.Read(DataType.DataBlock, 20, 0, VarType.Bit, 1);

}

}

I'm sure the connection is made because I can see with my debugger that the connection is good. When I force the data to true and take a picture of the value, this is TRUE. So it's good. The error is : WrongNumberReceivedBytes

Thank for you response. 

I tried, the second solution and the result was the same. I will try with the right type of data.

When I try to read the data with this lines  : plc.read("DB20.DBX0.0");

I have this result : "The variable'DB20.DBX0.0' could not be read. Please check the syntax and try again."