opc

OPC server access remotely using OPCDA.NET tools

可紊 提交于 2019-12-01 04:48:35
问题 I am developing OPC Client in windows C#. I have developed the code and reading OPC Items on Sampling as well as event based (OnDataChange). When I am working with local machine then my code works fine with both Sampling as well as OnDataChange, but when I am trying to read data from Remote OPC Server then Sampling works fine but I am not able fetch data on event based process. I am able to connect to the OPC Server but when i am adding subscription to it then i am getting error. HRESULT :

Specify Editors in Mercurial

心不动则不痛 提交于 2019-11-30 17:20:44
问题 In general, if I've got a custom file of type W and want to use custom application/editor X to open/view it how do i set up Hg to call the application X when i want to edit/view the file? Specific example: I'm using TortoiseHg to track a set of files, that are created by a custom application, an OPC server application called Kepserver. Kepserver creates .OPF files, while Hg can tell when the files have changed, I'd like to use the Kepserver application to view the files from Hg Workbench. I

What do the different DCOM / COM security settings mean?

淺唱寂寞╮ 提交于 2019-11-30 13:07:22
Our application uses COM and DCOM extensively, and so as part of that we need to ensure that the COM security permissions are correctly set up. I know that I can access these permissions under the Component Services MMC snap in and that I can set the defaults / limits under the property pages for the Computer And that under the DCOM Config node I can drill down and set securty permissions for individual applications I also understand the relationship between the "Defaults" (what DCOM applications will use unless permissions are expicily set on a per-application basis), "Limits" (what

OPC sample application for C# [closed]

跟風遠走 提交于 2019-11-30 03:23:44
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. Sevki https://fistfulofbytes.com/opc-sample-code I have posted sample code on how to use a dll "Interop.OPCAutomation.dll" enjoy... YOu may like this to visit http://www.opcconnect.com/source.php Visit the following webpages, where you can find source code, project files and documentation: Individual Visualization with OPC based on Microsoft® .NET and the Programming Language C# Mass Data Acquisition with an OPC

听说看了这篇文章就彻底搞懂了什么是OPC(上)

和自甴很熟 提交于 2019-11-28 18:32:17
从2000年初以来,我们就一直在使用OPC软件互操作性标准,而那些正准备踏入和想要踏入工业自动化领域的人们却对这些含义感到困惑。 所以在本中,我将系统地为你梳理OPC知识。 OPC首字母缩写词代表什么? 问一个OPC老手,他们或许会笑,因为他们知道有很多含义!在经典的且程序化的说法是: O LE for P rocess C ontrol(用于过程控制的OLE)。OLE 或对象链接和嵌入是Windows的基本早期构建块,允许应用程序在它们之间共享复杂的信息。我记得Windows 3.0的第一个演示中,人们将 Excel电子表格嵌入到 Microsoft Word文档中,以及更新电子表格,打开Word和更新文档的重要性。原始OPC标准源自该技术和 COM 或 Windows 组件对象模型。 从那以后,我们会听到很多其他的一些定义,但是比较出名的是现在官方OPC基金会所给出的说法是:它的含义是 O pen P latform C ommunications(开放平台通信)。其实无论它的定义是什么,其目标保持不变:消除自动化软件和硬件平台之间互操作性的障碍,为用户提供选择。 OPC Client(OPC客户端)和OPC Server(OPC服务器)之间有什么区别? OPC客户端请求数据,有时也想写入数据。如果允许的话,服务器会响应客户端的请求并提供数据或接受其写入。最简单的形式就是这样。

OPC UA : minimal code that browses the root node of a server

十年热恋 提交于 2019-11-28 17:40:57
I am using the OPC UA Foundation SDK to develop a small client. What would be the minimal C# code to: Connect to a server Browse the root node Print the immediate children's BrowseNames Quit? I am given the server endpoint (no discovery), security None. The code should make no use of config files, nor require a STA. Any help on this would be more than appreciated. Edit 4/2018: The OPC UA .Net Standard Library is going asynchronous. See the updated sample. Edit 9/2016: Everyone should see the new OPC UA .Net Standard Library . You can develop apps that run on all common platforms available

栈栈

邮差的信 提交于 2019-11-28 00:33:53
1. HDOJ4699 : 对顶栈的使用 //在这里遇到了传说中的scanf字符缓冲问题,,,哭了 //然后“https://bbs.csdn.net/topics/70106056”中有个大佬说使用空格可以保证输入流中过滤空格、TAB、\n这三中字符 //原因见“https://wenwen.sogou.com/z/q656588149.htm” //另外有个题解是添加了如下while代码块解决的问题,原因暂。。。求教张雷??orz while (opc<'A' || opc>'Z') { scanf("%c", &opc); cout << "opc:" << opc << '?'; } 来源: https://www.cnblogs.com/xzmxiao/p/11383013.html

OPC UA : minimal code that browses the root node of a server

|▌冷眼眸甩不掉的悲伤 提交于 2019-11-27 20:07:48
问题 I am using the OPC UA Foundation SDK to develop a small client. What would be the minimal C# code to: Connect to a server Browse the root node Print the immediate children's BrowseNames Quit? I am given the server endpoint (no discovery), security None. The code should make no use of config files, nor require a STA. Any help on this would be more than appreciated. 回答1: Edit 4/2018: The OPC UA .Net Standard Library is going asynchronous. See the updated sample. Edit 9/2016: Everyone should see

C# 读写opc ua服务器,浏览所有节点,读写节点,读历史数据,调用方法,订阅,批量订阅操作

时光怂恿深爱的人放手 提交于 2019-11-27 16:51:00
OPC是应用于工业通信的,在windows环境的下一种通讯技术,原有的通信技术难以满足日益复杂的环境,在可扩展性,安全性,跨平台性方面的不足日益明显,所以OPC基金会在几年前提出了面向未来的架构设计的OPC 统一架构,简称OPC UA,截止目前为止,越来越多公司将OPC UA作为开放的数据标准,在未来工业4.0行业上也将大放异彩。 在OPC UA的服务器端。会公开一些数据节点,或是方法等信息,允许第三方使用标准的OPC协议来进行访问,在传输层已经安全的处理所有的消息,对于客户端的访问来说,应该是非常清楚简单的。 本篇文章是讲述如何开发C#的OPC UA客户端的方式,关于如何开发OPC UA可配置的服务器,请参照另一篇博客: http://www.cnblogs.com/dathlin/p/8976955.html 这篇博客讲述了如何创建基于三菱,西门子,欧姆龙,ModbusTcp客户端,异形ModbusTcp客户端的OPC UA服务器引擎。 2.0版本说明 2018年8月18日 20:09:24 基于OPC UA的最新官方库,重新调整了订阅的代码实现,开源地址: https://github.com/dathlin/OpcUaHelper 除了组件的源代码之外,还包含了一个服务器的示例,就是下面的的示例操作。 更加详细的代码说明可以参照GitHub上的readme文件 前期准备

OPC协议和TCP/IP协议的区别和联系是什么

此生再无相见时 提交于 2019-11-27 10:10:57
  OPC(OLE for Process Control)技术是指为了给工业控制系统应用程序之间的通信建立一个接口标准,在工业控制设备与控制软件之间建立统一的数据存取规范。它给工业控制领域提供了一种标准数据访问机制,将硬件与应用软件有效地分离开来,是一套与厂商无关的软件数据交换标准接口和规程,主要解决过程控制系统与其数据源的数据交换问题,可以在各个应用之间提供透明的数据访问。 来源: https://www.cnblogs.com/cxyloveccy/p/11358262.html