I am working with a PC based automation software package called Think'n'Do created by Phoenix Contact It does real time processing, read inputs/ control logic / write outputs all done in a maximum of 50ms. We have an OPC server that is reading/writing tags from a PLC every 10ms. There is a long delay in writing a tag to the PLC and readi...
Where is a good place to start with making an application in .NET that communicates through OPC? ...
Folks, We have been using OpenXml APIs found in System.IO.Packaging for creating a package file that contains some Xml/Binary files, hence the package is some how structured as below: Package/ -/DataFolder1/an xml file.xml -/DataFolder2/another xml file.xml -/Bin/other binar files This has been used for version 1.0 of the applicat...
I'm looking for freeware library to connect to OPC DA 2.x server. So far, everything I found has commercial licensing, which is not an option for this project. ...
I have been trying to write a simple Markdown -> docx parser/writer, but am completely stuck with the last part, which should be the easiest: i.e. compressing the folder into a .docx that Word, or any other .docx reader, will recognize. My parser-writer is irrelevant really: I have this problem if I simply unzip any old Word-produced...
I'm working with a OPC Server control that stores data tags as variant types, described by System.Runtime.InteropServices.VarEnum. These types include the following, VT_BSTR (string), VT_I2 (short) and VT_I4 (long). All these values are stored by the server as objects and then I have to cast to the correct value when I fetch them. I kn...
Hi all, I am trying to grasp the link between OPC and DCOM. I have watched all four of the tutorials here and I think I have a good feeling for what OPC is, but in one of the tutorials (the third one 35 seconds in) the narrator states that OPC is based on DCOM, but I do not understand how the two are really linked. My confusion comes f...
I have one OPC ( OLE for Process control ) server project which is developed into visual studio 2005. I want to run it in visual studio 2008. The coding for the OPC server project is done in VC++. I want to connect my OPC client to this OPC server. When I was opened the OPC server project which was build into visual studio 2005 into visu...
I am currently new in OPC ( OLE for process control). I want to know about the interfaces IOPCServer, IOPCDataItem, IOPCGroup interfaces in the OPC. What are they used for & what is their role in terms of OPC Client & OPC Server & what methods & properties these interfaces conatins ? Can you provide me the answer for the above questions ...
I have downloaded & installed the OPCDA.NET client component evaluation & XMLDA.NET client component evaluation. It provides some C# samples for browsing the available OPC Server, connecting to the OPC server, & browsing the available items on the server. I know the programmatic way in which we can access the local OPC server. It is pro...
I have created one asp.net web service. In this web service I am using the web method as follows. The web service is related to the OPC ( OLE for process control) public string ReadServerItems(string ServerName) { string txt = ""; ArrayList obj = new ArrayList(); XmlServer Srv = new XmlServer(...
Hello. I am to build an automation solution based on WinPac-8000 controller (http://www.icpdas.com/products/PAC/winpac/introduction.htm). I split this project into 2 programs: 1st is running on the controller (it does some business logic) and second operates on user machine (it displays current results). The problem is: I use build-in ...
I'm running this code to connect to a plc. System.Guid guid=new Guid("75d00bbb-dda5-11d1-b944-9e614d000000"); System.Type t=Type.GetTypeFromCLSID(guid,node,true); object COMobject=System.Activator.CreateInstance(t); opcServer = (IOPCServer) COMobject; using the opc protocol as previously mentioned. I have little to no ex...
Does anyone know a C# OPC client sample application? I'm looking for a good opensource one to learn about the protocol. I would prefer it if it uses OPC foundation .net core apis. ...
I want to write opc client for server. And dont want use big libraries. can i do it witn .net libs? smth like adding reference to opcautomation? but i cant find it in vs2010. thx! ...
I'm writing opc client, using .NET API from opc foundation. In samples I only see, where item's names are hardcoded like: items[0] = new Opc.Da.Item(); items[0].ItemName = "blahblahblah"; What I want, is not to write names of all items by my hands. I want to load all items from server, into tree for example. How can I do it? ...
Hi everybody! I made a program basing on JeasyOpc source code, whan i try to use it on localhost there is no problem it works fine (i can see the opc server and can read signals from it). Than i tried to read signals from a another computer in our Lan - not working. I configured the DCOM as required but nothing helps. I even downloaded ...