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S7 200, OPC & C#

7/15/2006 8:08 AM	Rate (0)
uglydragon79 Posts: 2 Rating: (0)	Hi, I'm having some problems with the OPC server via C#. Now I'm not sure if the posting should be here or in the Simatic S7 / PLC forum, but the PC based part simply alters values in the memory. Either way, I can't seem to figure out what data type is to be used when passing parameters to the OPC server. The method asks that i send type array and the VB6 example uses specified datatypes. I tried having typed arrays (string[] etc.) and I tried having System.Array.CreateInstance(). But neither seems to work. Can someone help me out here? Many thanks, Steve
uglydragon79 Posts: 2 Rating: (0)
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7/27/2006 1:53 PM	Rate (0)
Cicero Gold Member Joined: 10/10/2005 Last visit: 11/27/2024 Posts: 1921 Rating: (136)	Hello, regarding to your inquiry we would like to inform you. Please see the home page of the SIMATIC customer support and find the following FAQ which do you will find by the quoted Beitrags-ID: http://www.siemens.com/automation/csi_en/product S7-200 PC Access and further OPC-Clients -- Configuring and programming communication -- Programming and connection OPC clients Beitrags-ID: 21601611 With best regards Cicero

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7/28/2006 2:11 AM	Rate (0)
Westcoaster Posts: 1 Rating: (0)	I ran into the same problem but in VB.net 2005. and eventually figured it out. The main problem is that the arrays in the opc dll is 1 based. The .net programs are 0 based (can't be changed to 1 based like vb6) In .net 2005 you can indirectly create a 1 based array by using CreatInstance (like you have done) however I found an option to create a 1 based array (it doesn't seem to be documented). I have attached the VB6 sample that came with the PC-access which i have modified to work with .NET. It is in VB.net but it should be relatively straight forward to convert to c# Hope it helps. I have not converted the async read and writes (i think) so only look at the sync read and writes commands Note the array_length variable and array_lowerbound arrays. Attachment MainFormTweaked.zip (969 Downloads)
Westcoaster Posts: 1 Rating: (0)	Last edited by: Westcoaster at: 7/28/2006 2:18 AM
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