Read Operands?

[foxxs]

I've created a fairly workable application to retrieve data from the data tables of the PLC's (PL-570) i'm working with, however I would like to also be able to gather all of the operands (MB, MI, SI, etc) as well, and format them into organized datagridviews in vb.net. I'd like to use a similar method as I've used for the tables if possible:

   Public Sub ReadDataTables(IP As String, port As Integer, protocal As EthProtocol, retries As Integer, timeoutMs As Integer)
       Dim frmClockTables As New Form
       Dim Tabs As New TabControl
       frmClockTables.Controls.Add(Tabs)
       Tabs.Dock = DockStyle.Fill
       Try
           ethernet1 = New Ethernet(IP, port, protocal, retries, timeoutMs)
           plc1 = PLCFactory.GetPLC(ethernet1, 0)
           dtTables = New DataTables(plc1, DataTablesReadOptions.StructureAndValues)
       Catch ex As Exception
           MessageBox.Show("Could not connect to " & IP & " on port " & port)
       End Try
       Try
           ethernet1 = New Ethernet(IP, port, protocal, retries, timeoutMs)
           plc1 = PLCFactory.GetPLC(ethernet1, 0)
           dtTables = New DataTables(plc1, DataTablesReadOptions.StructureAndValues)
       Catch ex As Exception
           MessageBox.Show("Could not connect to " & IP & " on port " & port)
       End Try

       Dim colcount As Integer = 0
       Dim rowcount As Integer = 0
       For Each item In dtTables.Tables
           Dim data As New DataGridView
           Dim tab As New TabPage
           tab.Text = item.Name.ToString
           tab.Controls.Add(data)
           data.Dock = DockStyle.Fill
           Tabs.TabPages.Add(tab)
           colcount = item.Columns.Count
           rowcount = item.Rows.Count

           Dim i As Integer = 0
           For Each column In item.Columns
               data.ColumnCount = colcount
               data.RowCount = rowcount
               data.Columns(i).Name = column.Name.ToString
               For Each Cell In column.Cells
                   Dim cellvalue As String = ""
                   For Each Field In Cell.Fields
                       If Not cellvalue = "" Then
                           cellvalue &= ";"
                       End If
                       cellvalue &= Field.Value
                   Next
                   data.Rows(Cell.RowIndex).Cells(Cell.ColumnIndex).Value = cellvalue
               Next
               i += 1
           Next
           NumberAllRows(data)
       Next
       frmClockTables.Show()
   End Sub

how can this be done, or can it be done at all?

[Saragani]

Are you familiar with the plc.ReadWrite ?

You can read or/and write values of Operands. You simply send an array of ReadWriteRequest to that function, which will ultimatly return you a the requests filled with what you have requested.

What you do after that (Either showing it in a table, creating a Scada or whatever) is your own code.

You want to show it in a table, that's fine. You can create an array of requests that the first one will read 100 MIs, the second will read 100 MBs, and the 3rd 100 SIs

Iterate the indexes from 0 to 99 (le'ts call it J), and then inside it, iterate the requests inside the array.

Each Read request has a property called Values. If you get the Value at index J then you get the value of the current "Row" on your table.

[foxxs]

I'm actually not familiar with plc.readwrite, are their any examples on the forms somewhere, or maybe an API i could work with. im trying to get listen mode to work as well (cant seem to get my program to actually LISTEN on a port)? i was not able to find any detailed documentation on ether subject for .net, though admittedly i may be looking in the wrong places.

thank you for your help!

[Saragani]

http://www.unitronics.com/Data/Uploads/communication/Unitronics_Communication_Driver_for_Dot_Net.pdf

The following link also has the examples (but compiled with an old version of the dll):

http://www.unitronics.com/Data/Uploads/Dot_NET/Unitronics%20Communication%20Driver.rar

[foxxs]

I was able to get listen mode working perfectly with this example, and reading operands looks fairly straightforward, though I've not integrated that just yet.

Thank you so much Saragani!