ModbusTCP SendData DLL Instance not created

[iDeeW]

Everybody ,

I'm using the latest version & getting an error when I try to write a register.

Code: [Select]

ModbusTCPCom1.Write(40016, 100)
Below is the full error massage. Any ideas?

An exception of type 'MfgControl.AdvancedHMI.Drivers.Common.PLCDriverException' occurred in MfgControl.AdvancedHMI.Drivers.dll but was not handled in user code

Additional information: ModbusTCP SendData DLL Instance not created

Thanks,

[Archie]

Try to do a read before doing the write

[iDeeW]

I wanted to use it with TextChange event of a Textbox.

Code: [Select]

Private Sub tbAlm_TextChanged(sender As Object, e As EventArgs) Handles tbAlm.TextChanged
        ModbusTCPCom1.Write(40016, 100)
    End Sub
The above error pops, when I hit F5 to start the app.

When I do it the same with a button click event, everything works.

Thanks

[Godra]

I just tested your code and it works with the TextChanged event of a TextBox.

Tried it with both direct and indirect change of the text.

As Archie suggested, also try reading before writing:

Code: [Select]

    Private Sub tbAlm_TextChanged(sender As Object, e As EventArgs) Handles tbAlm.TextChanged
        ModbusTCPCom1.Read("40016")
        ModbusTCPCom1.Write("40016", "100")
    End Sub


[ddddd13]

I tried the same thing it didn't work. When I put the quotation marks in "40005", "1" it worked!!!

[Godra]

The code I posted already shows them both with quotation marks.

One needs to observe the format of the function while typing the code.
If it asks for a String and Integer value is typed instead, causing issues, then just "quote" it.