Topics

1

Support Questions / Float Register with Modbus

« on: March 20, 2024, 06:47:41 AM »

Good morning, I am doing some Float register readings in modbus TCP and I am using the AnalogoValueDisplay with PlcAddressValue F40001. It reads correctly the float register, taking register 40002 as the most significant register (where the sign and the exponent are), I wonder how I could do it the other way round, that is, with register 40001 as the most significant register.

Thank you very much

2

Support Questions / Basic Indicator On wiith decimal value

« on: March 14, 2024, 06:25:26 AM »

Good morning friends, I have been trying all day to turn on a BasicIndicator in red colour for example when the modbus register is at a decimal value of 101 and when it is at any other value the indicator is off. But something escapes me because as much as I try I don't get it. How could I do this?

 Thank you very much!

 

3

Open Discussion / ON/OFF Button for bit in a register Modbus TCP

« on: February 05, 2024, 01:18:02 PM »

Hi, I'm new with VB and I was looking for some forum posts to create a couple of buttons for an application. The first button is to set to 1 independent bits of a modbus tcp register and for that I have used Godra's code in another post:

Private Sub BasicButton1_Click(sender As Object, e As EventArgs) Handles BasicButton1.Click
    Try
        Dim b_Num As Integer = 1 'or if dynamically changing then call it from a TextBox, like: Dim b_Num As Integer = TextBox1.Text
        Dim Value = Me.ModbusTCPCom1.Read("40001")
        Me.ModbusTCPCom1.Write("40001", Value Or 2 ^ (b_Num - 1))
    Catch ex As Exception
        System.Windows.Forms.MessageBox.Show("Failed to write value. " & ex.Message)
    End Try

 The second button I created to disable the bit of the word I enabled earlier and for this I used the same Godra code and changed the following command:

Me.ModbusTCPCom1.Write("40001", Value - 2 ^ (b_Num - 1)).

The off button is only connected and appears on screen if the bit it disables is set to 1, but if you quickly hit the button before the associated bit is disabled, it is able to subtract more than once the same bit, how could I avoid it to subtract more than once and not modify the register in a wrong way? Can you think of another way to create an off/on button for independent bits of a register?