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OPC Client C#

Created by: drihtar at: 12/28/2007 6:15 PM (2 Replies)

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12/28/2007 6:15 PM	Rate (0)
drihtar Posts: 2 Rating: (0)	Hello! I have a problem. I have s7-200 plc connected to pc where I run PC Access. I have to build a OPC Client using VisualStudio and C#. Where to start?
drihtar Posts: 2 Rating: (0)
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1/2/2008 3:37 PM	Rate (0)
Denilson Pegaia Diamond Member Joined: 9/23/2005 Last visit: 12/26/2025 Posts: 4434 Rating: (1487)	Hi, I suggest you start taking a look at http://support.automation.siemens.com/WW/view/en/7888239
	Denilson Pegaia Siemens Industry Sector Technical Support
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2/4/2008 9:54 AM	Rate (0)
drihtar Posts: 2 Rating: (0)	Hello! Well I have started developing OPCClient using Visual C#. It works yust fine (connecting to server, browsing ang adding groups) but there is a problem when I add items. I use sopcdaauto.dll. Here is how I declare variables: Array MyItemServerHandles = Array.CreateInstance (typeof (long),100) Array ItemID = Array.CreateInstance(typeof(String), NumbOfItems) Array ItemClientHandle = Array.CreateInstance(typeof(int), NumbOfItems) Array Errors = Array.CreateInstance(typeof(int), NumbOfItems) I declare ItemID and itemClientHandle, but Errors and ServerHandles are arrays server should return.. AddItems function looks like this: MyItems.AddItems(NumbOfItems, ref ItemID, ref ItemClientHandle, out MyItemServerHandles, out Errors, "VT_EMPTY", "") Project builds successfully, but no items are added and Array MyItemServerHandles is empty..
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