Subscribing to PLC data via code

VB Example:

The AdvancedHMI drivers support a subscription that will automatically poll data and return the values. The DataSubscriber provides a non-code method of using this service. However, there are times when it is desired or more efficient to subscribe using code. This is an example on how to do this:

   Private SubscriptionID1 As Integer
   Private Sub Button2_Click_1(sender As Object, e As EventArgs) Handles Button2.Click
       SubscriptionID1 = EthernetIPforCLXCom1.Subscribe("MyTag", 1, 500, AddressOf Subscription_DataReceived)
   End Sub

   Private Sub Subscription_DataReceived(sender As Object, e As Drivers.Common.PlcComEventArgs)
       If e.ErrorId=0 AndAlso e.Values IsNot Nothing AndAlso e.Values.Count>0 Then
           Label1.Text = e.Values(0)
       End If
   End Sub

   Private Sub MainForm_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
       EthernetIPforCLXCom1.UnSubscribe(SubscriptionID1)
   End Sub

The rate at which data is polled is determined by the value of the PollRateOverride property.

Each driver is highly optimized for communications using subscriptions. All of the visual controls (e.g. Gauge) use the subscription mechanism to receive their data.

C# Example:

The Following is an example of how to programmatically set PLC Items to a dataSubscriber2 component. First you must create 3 com drivers and 3 dataSubscriber2 components that are bound to the 3 com drivers

the example below uses 3 EthernetIPforSLCMicroCom components with poll rate overrides of:

Slow: 1000; (CommDewax1Slow) Medium: 500; (CommDewax1Medium) Fast: 100; (CommDewax1Fast)

Be sure to set the "DataChanged" Event handler to the custom methods below

   using AdvancedHMIDrivers;
   using AdvancedHMIControls;
   using MfgControl.AdvancedHMI.Drivers;
   using System;
   using System.Collections.Generic;
   using System.ComponentModel;
   using System.Data;
   using System.Drawing;
   using System.Linq;
   using System.Text;
   using System.Threading.Tasks;
   using System.Windows.Forms;
   using MfgControl.AdvancedHMI.Drivers.Common;
   //
   namespace AdvancedHMICS
   {
       public partial class MainForm : Form
       {
           #region PLCItemsLists
           List<PLCAddressItem> PLCDewaxer1SlowItems = new List<PLCAddressItem>();
           List<PLCAddressItem> PLCDewaxer1MediumItems = new List<PLCAddressItem>();
           List<PLCAddressItem> PLCDewaxer1FastItems = new List<PLCAddressItem>();
           #endregion
           public MainForm()
           {
               InitializeComponent();
               #region DataSubscribers (Continuation)
               #region Add PLCItems (Slow, Medium, Fast)
               #region Add PLCSlowItems
               PLCDewaxer1SlowItems.Add(new PLCAddressItem("F8:1"));
               PLCDewaxer1SlowItems.Add(new PLCAddressItem("F8:2"));
               PLCDewaxer1SlowItems.Add(new PLCAddressItem("F8:3"));
               PLCDewaxer1SlowItems.Add(new PLCAddressItem("F8:4"));
               PLCDewaxer1SlowItems.Add(new PLCAddressItem("F8:5"));
               #endregion
               #region Add PLCMediumItems 
               PLCDewaxer1MediumItems.Add(new PLCAddressItem("C5:1.ACC"));
               PLCDewaxer1MediumItems.Add(new PLCAddressItem("C5:2.ACC"));
               PLCDewaxer1MediumItems.Add(new PLCAddressItem("C5:3.ACC"));
               #endregion
               #region Add PLCFastItems
               PLCDewaxer1FastItems.Add(new PLCAddressItem("N7:1"));
               PLCDewaxer1FastItems.Add(new PLCAddressItem("N7:2"));
               PLCDewaxer1FastItems.Add(new PLCAddressItem("N7:3"));
               #endregion
               #endregion
               // bind the PLCAddressItems to the Subscribers
               for (var i = 0; i < PLCDewaxer1SlowItems.Count(); i ++)
               {
                   DataDewax1Slow.PLCAddressValueItems.Add(PLCDewaxer1SlowItems[i]);
               }
               for (var i = 0; i < PLCDewaxer1MediumItems.Count(); i++)
               {
                   DataDewax1Medium.PLCAddressValueItems.Add(PLCDewaxer1MediumItems[i]);
               }
               for (var i = 0; i < PLCDewaxer1FastItems.Count(); i++)
               {
                   DataDewax1Fast.PLCAddressValueItems.Add(PLCDewaxer1FastItems[i]);
               }           
               #endregion
           }
           private void DataDewax1Slow_DataChanged(object sender, PlcComEventArgs e)
           {
               if (e.ErrorId == 0 && e.Values != null && e.Values.Count() > 0)
               {
                   try
                   {
                       if (e.PlcAddress == "F8:1")
                       {
                           label1.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "F8:2")
                       {
                           label2.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "F8:3")
                       {
                           label3.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "F8:4")
                       {
                           label4.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "F8:5")
                       {
                           label5.Text = e.Values[0];
                       }
                   }
                   catch (Exception ex)
                   {
                       errorMsg1.Text = "Source: " + ex.Source + " Message: " + ex.Message;
                   }                 
               }
           }
           private void DataDewax1Medium_DataChanged(object sender, PlcComEventArgs e)
           {
               if (e.ErrorId == 0 && e.Values != null && e.Values.Count() > 0)
               {
                   try
                   {
                       if (e.PlcAddress == "C5:1.ACC")
                       {
                           label6.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "C5:2.ACC")
                       {
                           label7.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "C5:3.ACC")
                       {
                           label8.Text = e.Values[0];
                       }
                   }
                   catch (Exception ex)
                   {
                       errorMsg2.Text = "Source: " + ex.Source + " Message: " + ex.Message;
                   }
               }
           }
           private void DataDewax1Fast_DataChanged(object sender, PlcComEventArgs e)
           {
               if (e.ErrorId == 0 && e.Values != null && e.Values.Count() > 0)
               {
                   try
                   {
                       if (e.PlcAddress == "N7:1")
                       {
                           label9.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "N7:2")
                       {
                           label10.Text = e.Values[0];
                       }
                       if (e.PlcAddress == "N7:3")
                       {
                           label11.Text = e.Values[0];
                       }
                   }
                   catch (Exception ex)
                   {
                       errorMsg3.Text = "Source: " + ex.Source + " Message: " + ex.Message;
                   }
               }
           }        
       }
   }