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Questions tagged [opc]

OPC (Open Platform Communications) is the interoperability standard for the secure and reliable exchange of data in the industrial automation space.

OPC (Open Platform Communications) is the interoperability standard for the secure and reliable exchange of data in the industrial automation space.

From: http://www.opcfoundation.org/

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648 questions
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OPCItemRead SyncItemServerError: -1073479679

Using the communication Library for Kepware OPC Server v4.0 (OPCServerCommLib.dll) I started receiving this error when I try to disconnect from the OPC server. Information about this error is available from nowhere and Kepware support was unable to…
Scott Solmer
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File access in C for implemenation of a protocol OPC UA

In OPC UA embedded stack, some libraries exist already, the task is to implement the callback functions to facilitate the server with data access capability.. For historical access, for instance, the historical data for a specific node (node_handle)…
user1798597
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How to handle connection abort to OPC Server

I have written a library which connects to an opc server and creates subscriptions to get notified about data changes. There is also an event which get fired when the opc server is going to shutdown. I am using the OPC .NET API and C#. How can I…
Bastian
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Guide in understanding OPC concepts

im trying to learn OPC for a project we are developing, i thought i understood a couple of things but a discussion with a colleague showed me otherwise So, please correct me if wrong on these terms/concepts: OPC is basically a protocol that allows…
sergio
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PLC Data Logging System: Some basic questions

I am currently trying to work with PLC. I am using kepware data logger to collect the PLC log data. The output is like below: Time Stamp Signal Signal O/P 20130407104040.2 …
alessandro
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OPC Da Write Bit in Word

I'm using OPC DA Automation Wrapper to connect to an AllenBradley PLC. I now have the requirement to set a bit within a word, independently to any other bits. Is there any way in which I can achieve this function rigorously? The two options I have…
Nick Williams
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How to make a type safe wrapper around Variant values

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…
Matt Warren
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Activate/ Deactivate specific opc items in active opc subscription without recreating it

I am developing a client / server applicatiod based on opc using OPC Net API. My server is an OPC Client that provides process data to clients via WCF service infrastructure. Depending on what tags are connected by my clients I want to react on my…
Marco Reichert
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Magento Default one page checkout Not Working - Jquery Conflict

I have configure two Magento stores on one installation. In these two, primary store one page checkout not working fine [ Actually it does not move to next step - billing step ] in step2. When view the source via browser it does not require…
user2228731
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Entity Framework - Events Issue

I'm just starting to force myself to use Entity Framework (I know I'm a long way behind), but I've fallen at the first hurdle. The program I'm writing simply watches a PLC for a bit to become true. When it does become true an event fires and then…
Nick Williams
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opc server written in java makes my java UI stop working

I have created a user interface in java which uses card layout. It basically shows a lot of readings in it which it receives through our company's local network. Now I had to write an OPC server in java so that all the readings my ui receives is…
user2076106
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Single instance of OPC client in WCF RIA Service

I'm developing a simple Silverlight app. The application will display the information found in the tags of an OPC server, running in the same machine of the web server. I implemented a domain service class with a method that let the client ask for…
Pomp
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Pi Historian, Only show result if value equals

I am using PI Historian to read values from some Tag Points. I am using this particular Historian software http://www.osisoft.com/ I would like to know if I can get it to show results if contains certain "text" or "result" Where is says Tag Mask I…
Mowgli
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Opc.Da.Browse children?

I have this listing to browse the root elements of my Opc.Da server: Dim clone As Opc.Da.Server = m_server Dim id As New Opc.ItemIdentifier Dim filters As New Opc.Da.BrowseFilters filters.BrowseFilter = Opc.Da.browseFilter.all Dim pos As…
søren hyltoft
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Outgoing Telnet fails however ping works

We have an OPC Server running on windows server 2003. I am using an OPC client from a remote machine running on Windows Server 2008. From the OPC Server node, I can ping the Client node. However I am not able to telnet ( I tried only port 135 which…
lostpacket
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