OPC UA Standard|Forum|OPC Foundation Log InSelect ForumAnnouncementsProduct and Service RequestsSuggestionsOPC MarketplaceOPC UA StandardOPC UA Companion StandardsOPC UA Implementation: Stacks, Tools, an…OPC Certification and Interoperability T…Classic OPC: DA, A&E, HDA, XML-DA, e…Miscellaneous SearchAdvanced SearchSearchForum ScopeCurrent forumAll forumsMatchMatch any wordMatch all wordsMatch phraseForum OptionsPosts onlyTopic titles onlyPosts and topic titlesMinimum search word length is 3 characters - maximum search word length is 84 characters Search Login name Password Remember me Lost password? HomeForumOPC UA Standard OPC UA StandardQuestions about OPC UA technology and specifications etc.Page: 12345 59 Is it allowed to set the value to null on a mandatory property in an EventType?Started By Mikael Eklund - 08/12/2026 - 01:07Replies: 1 Views: 31 Last Post Randy Armstrong - 3 days ago Figure B.8 missing in OPC 10000-3Started By Thomas Schulz_2 - 08/10/2026 - 00:27Replies: 2 Views: 21 Last Post Thomas Schulz_2 - 4 days ago Intro sentence of 9.1 General; OPC 10000-3; OPC Unified Architecture Part 3 :Address Space Model; Release 1.05.06; 2025-10-22Started By Thomas Schulz_2 - 08/10/2026 - 01:03Replies: 2 Views: 24 Last Post Thomas Schulz_2 - 4 days ago Need Guidance on PublishRequest TimeoutHintStarted By Ross Turton - 06/19/2026 - 08:44Replies: 1 Views: 144 Last Post Randy Armstrong - 2 months ago QuantitiesFolderType and UserCredentialCertificateType removed from standardStarted By Mattias Häggkvist - 05/04/2026 - 08:17Replies: 5 Views: 240 Last Post Randy Armstrong - 2 months ago Confusion about error codesStarted By Patrick Berger - 12/12/2025 - 02:09Replies: 5 Views: 442 Last Post Randy Armstrong - 3 months ago Facing issue of disconnect after 57 minutes in OPCUA server built on Dot net , using OPCUACore.dll version 1.5.374.158Started By Vinay Salian - 05/20/2026 - 20:50Replies: 1 Views: 105 Last Post Randy Armstrong - 3 months ago Server Index in NodeIdStarted By CHIRANTAN JOSHI - 03/20/2024 - 00:15Replies: 1 Views: 803 Last Post Sebastian Allmendinger - 5 months ago Change of Namespaces after the server has startedStarted By Siyuan Xu - 03/02/2026 - 03:36Replies: 2 Views: 224 Last Post Siyuan Xu - 5 months ago Namespace of BrowseNames of standard FileType methods Open/Close,...Started By Nico Buhl - 03/02/2026 - 00:05Replies: 1 Views: 261 Last Post Randy Armstrong - 5 months ago Structure with subtyping and Optional fieldsStarted By Rahul Rahul_1 - 02/23/2024 - 04:57Replies: 9 Views: 1111 Last Post Randy Armstrong - 5 months ago Status code BadNodeIdUnknown when reading attributes from a variable in namespaceindex 0 Started By Mikael Eklund - 02/23/2026 - 07:12Replies: 1 Views: 367 Last Post Randy Armstrong - 6 months ago Page: 12345…59 Forum Timezone: America/PhoenixMost Users Ever Online: 1361Currently Online: Guest(s) 36Currently Browsing this Page: 16 Guest(s)Top Posters: Forum Stats: Groups: 2Forums: 10Topics: 1530Posts: 5173 Usage Policy © Simple:Press — Privacy Policy New / Updated TopicsMissing Product in Marketplace SearchIs it allowed to set the value to null o…Figure B.8 missing in OPC 10000-3Intro sentence of 9.1 General; OPC 10000…Need Guidance on PublishRequest TimeoutH…QuantitiesFolderType and UserCredentialC…Confusion about error codesFacing issue of disconnect after 57 min…No endpoints discovredUnable to test method call with UACTT Li…Model Compiler usage for client sideRAM memory concernsOPC UA Client Application Certificate Se…PHP or Javascript implementationIs upgrading to OPC Core Components v3.1…How to develop an OPC Xi (WCF) Server OPC Core Components Redistributables ICE…OPC Core Components Redistributables Err…How to Develop a OPC DA Client in 2026Missing OPCAutomation.dll After Installi…