# \#opcua **URL:** https://forum.inductiveautomation.com/tag/opcua/75.md [Latest](https://forum.inductiveautomation.com/latest.md) · [Categories](https://forum.inductiveautomation.com/categories.md) · [Tags](https://forum.inductiveautomation.com/tags.md) --- ## [Source Timestamp in SFB33 Siemens block](https://forum.inductiveautomation.com/t/source-timestamp-in-sfb33-siemens-block/117511)
**Author:** [@alberto.vazquez](https://forum.inductiveautomation.com/u/alberto.vazquez)\ **Replies:** 0\ **Last updated:** [October 16, 2026, 8:01am UTC](https://forum.inductiveautomation.com/t/source-timestamp-in-sfb33-siemens-block/117511 "2026-10-16T08:01:16Z")
Hi, Just throwing a bottle to the sea. I have a Siemens S7-400 with an SFB33 block that natively stores the timestamp at which it was activated. You can recover this data via a WinCC supervision, and in AVEVA via the si… --- ## [OPC UA Server Max Connection number and Rate Limiter](https://forum.inductiveautomation.com/t/opc-ua-server-max-connection-number-and-rate-limiter/117380)
**Author:** [@Gomez](https://forum.inductiveautomation.com/u/Gomez)\ **Replies:** 6\ **Last updated:** [October 8, 2026, 4:57pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-max-connection-number-and-rate-limiter/117380 "2026-10-08T16:57:26Z")
Hi, my customer is connecting 34 UA Client services ( they are going to growth ) coming from the same ip address ( ERP Server ) and subscribe around 10/15 tags each, to an Ignition 8.1 UA Server. When he want to write a… --- ## [8.1 and 8.3 endpoint validation issues](https://forum.inductiveautomation.com/t/8-1-and-8-3-endpoint-validation-issues/117039)
**Author:** [@tyler2](https://forum.inductiveautomation.com/u/tyler2)\ **Replies:** 8\ **Last updated:** [September 14, 2026, 12:56pm UTC](https://forum.inductiveautomation.com/t/8-1-and-8-3-endpoint-validation-issues/117039 "2026-09-14T12:56:30Z")
I have gone through OPC-UA Client connection issues - Ignition - Inductive Automation Forum and a few others. My vendor's documentation provides the following cause & "resolution" for the endpoint mismatch upon connectio… --- ## [Connecting Ignition to Vendor Device/OPC Client](https://forum.inductiveautomation.com/t/connecting-ignition-to-vendor-device-opc-client/116904)
**Author:** [@Everett\_Cass](https://forum.inductiveautomation.com/u/Everett_Cass)\ **Replies:** 1\ **Last updated:** [September 2, 2026, 8:47pm UTC](https://forum.inductiveautomation.com/t/connecting-ignition-to-vendor-device-opc-client/116904 "2026-09-02T20:47:01Z")
Okay I have this Vendor Device from FOSS/ProcessScan2. It has an option to connect to an OPC UA Server, from my understanding from that server its expecting to have pre-defined opc paths/string node ID's. The purpose of … --- ## [UaExpert cannot connect with Ignition OPC server on same host](https://forum.inductiveautomation.com/t/uaexpert-cannot-connect-with-ignition-opc-server-on-same-host/116824)
**Author:** [@maknem](https://forum.inductiveautomation.com/u/maknem)\ **Replies:** 4\ **Last updated:** [August 18, 2026, 8:20pm UTC](https://forum.inductiveautomation.com/t/uaexpert-cannot-connect-with-ignition-opc-server-on-same-host/116824 "2026-08-18T20:20:29Z")
I have trial version of Ignition 8.3.8. I am trying to use the OPC Server in UaExpert OPC client on same host. OPC server is set with below settings In trusted certificates I see only Ignition OPC UA Server. Quaranti… --- ## [Free OPC UA simulator + web browser client, useful for testing gateway connections](https://forum.inductiveautomation.com/t/free-opc-ua-simulator-web-browser-client-useful-for-testing-gateway-connections/116715)
**Author:** [@dru.steeby](https://forum.inductiveautomation.com/u/dru.steeby)\ **Replies:** 1\ **Last updated:** [August 8, 2026, 9:47pm UTC](https://forum.inductiveautomation.com/t/free-opc-ua-simulator-web-browser-client-useful-for-testing-gateway-connections/116715 "2026-08-08T21:47:29Z")
Sharing a free, open-source OPC UA toolkit that's useful alongside Ignition. Credit first, since it's a fork: the simulator half is built on Microsoft's open-source OPC PLC sample (GitHub - Azure-Samples/iot-edge-opc-plc… --- ## [OPC tags desync from siemens PLC](https://forum.inductiveautomation.com/t/opc-tags-desync-from-siemens-plc/116554)
**Author:** [@Daniel\_Vestol](https://forum.inductiveautomation.com/u/Daniel_Vestol)\ **Replies:** 1\ **Last updated:** [July 29, 2026, 4:14am UTC](https://forum.inductiveautomation.com/t/opc-tags-desync-from-siemens-plc/116554 "2026-07-29T04:14:55Z")
We have some tags bound directly to a boolean in a symbolic siemens DB. Their configuration is about as simple as it gets: We are now experiencing an issue where they at times randomly change state in ignition, witho… --- ## [SLC OPC Connection Path Through Two ControlLogix Chassis](https://forum.inductiveautomation.com/t/slc-opc-connection-path-through-two-controllogix-chassis/107133)
**Author:** [@Jacob\_Sanchez](https://forum.inductiveautomation.com/u/Jacob_Sanchez)\ **Replies:** 6\ **Last updated:** [July 21, 2026, 9:36pm UTC](https://forum.inductiveautomation.com/t/slc-opc-connection-path-through-two-controllogix-chassis/107133 "2026-07-21T21:36:48Z")
Ignition 8.1.31 I'm trying to configure an SLC 5/04 OPC-UA device driver. It routes through two ControlLogix chassis. The SLC(5/04) itself is connected to a DH+ network which connects back to one of the ControlLogix cha… --- ## [OPC UA Methods array error](https://forum.inductiveautomation.com/t/opc-ua-methods-array-error/115956)
**Author:** [@Adarsh\_K](https://forum.inductiveautomation.com/u/Adarsh_K)\ **Replies:** 2\ **Last updated:** [July 20, 2026, 9:58am UTC](https://forum.inductiveautomation.com/t/opc-ua-methods-array-error/115956 "2026-07-20T09:58:33Z")
I am calling a Siemens PLC OPC UA Method from Ignition Perspective using system.opcua.callMethod(). The method expects 2 inputs: Header — custom struct Parameter — Array\[0..1\] of custom struct When I sent one p… --- ## [Intermittent OPC Issues](https://forum.inductiveautomation.com/t/intermittent-opc-issues/116399)
**Author:** [@Josh\_Meseke](https://forum.inductiveautomation.com/u/Josh_Meseke)\ **Replies:** 4\ **Last updated:** [July 15, 2026, 5:33pm UTC](https://forum.inductiveautomation.com/t/intermittent-opc-issues/116399 "2026-07-15T17:33:47Z")
We have a setup with an OPC connection to our DCS/PCS setup. Generally speaking, this OPC connection has been stable but following a recent upgrade to our PCS server, we've encountered a lot of issues on this OPC connect… --- ## [Ignition OPCUA Server "Null" Datatype](https://forum.inductiveautomation.com/t/ignition-opcua-server-null-datatype/116249)
**Author:** [@alvise.garbin](https://forum.inductiveautomation.com/u/alvise.garbin)\ **Replies:** 6\ **Last updated:** [July 7, 2026, 2:38pm UTC](https://forum.inductiveautomation.com/t/ignition-opcua-server-null-datatype/116249 "2026-07-07T14:38:14Z")
Hello everyone, I am currently experiencing an issue with the "Null" data type on an Ignition OPC UA Server. I have created a string tag (both inside a UDT and standalone) with its value source set as "Memory". The tag… --- ## [How should I read S7-300 DB addresses (e.g. DB916,DBD228) in Ignition OPC?](https://forum.inductiveautomation.com/t/how-should-i-read-s7-300-db-addresses-e-g-db916-dbd228-in-ignition-opc/116269)
**Author:** [@galeman](https://forum.inductiveautomation.com/u/galeman)\ **Replies:** 2\ **Last updated:** [July 6, 2026, 5:37pm UTC](https://forum.inductiveautomation.com/t/how-should-i-read-s7-300-db-addresses-e-g-db916-dbd228-in-ignition-opc/116269 "2026-07-06T17:37:19Z")
I'm configuring an OPC Tag in Ignition to read a value from a Siemens S7-300 PLC. The PLC address I was given is: DB916,DBD228 The OPC device name in Ignition is: L12\_VarioAsep The OPC Item Path is currently configu… --- ## [Ignition OPC-UA Client randomly disconnects from Kepware server](https://forum.inductiveautomation.com/t/ignition-opc-ua-client-randomly-disconnects-from-kepware-server/116128)
**Author:** [@e4andVibes](https://forum.inductiveautomation.com/u/e4andVibes)\ **Replies:** 5\ **Last updated:** [June 24, 2026, 3:30pm UTC](https://forum.inductiveautomation.com/t/ignition-opc-ua-client-randomly-disconnects-from-kepware-server/116128 "2026-06-24T15:30:13Z")
Hello everyone, I have an Ignition Edge version 8.1.36 running on a Linux edge computer which subscribes to over 7200 tags over OPC-UA. The Kepware project is configured with 2 channels, with one channel holding around … --- ## [S7-1500 OPC UA Type info issues](https://forum.inductiveautomation.com/t/s7-1500-opc-ua-type-info-issues/113857)
**Author:** [@rickard.eriksson](https://forum.inductiveautomation.com/u/rickard.eriksson)\ **Replies:** 28\ **Last updated:** [June 23, 2026, 11:45pm UTC](https://forum.inductiveautomation.com/t/s7-1500-opc-ua-type-info-issues/113857 "2026-06-23T23:45:45Z")
I have used OPC UA and Siemens UDTs and Structs throughout my entire project without issues. Now suddenly new tags are starting to show up like this, It’s not giving me the tags in the struct as a JSON. I guess its somet… --- ## [OSI PI OPC-UA Connector](https://forum.inductiveautomation.com/t/osi-pi-opc-ua-connector/116017)
**Author:** [@michael.flagler](https://forum.inductiveautomation.com/u/michael.flagler)\ **Replies:** 6\ **Last updated:** [June 17, 2026, 11:13pm UTC](https://forum.inductiveautomation.com/t/osi-pi-opc-ua-connector/116017 "2026-06-17T23:13:11Z")
I'm working with a client currently to try to get their OSI PI connector to talk to Ignition, but we're not having any luck. We've followed the suggestions on the other threads on here (see below), but our options don't … --- ## [About Kepware certificate being automatically added under OPC UA Client Certificate](https://forum.inductiveautomation.com/t/about-kepware-certificate-being-automatically-added-under-opc-ua-client-certificate/115957)
**Author:** [@m\_tanaka](https://forum.inductiveautomation.com/u/m_tanaka)\ **Replies:** 2\ **Last updated:** [June 15, 2026, 1:34am UTC](https://forum.inductiveautomation.com/t/about-kepware-certificate-being-automatically-added-under-opc-ua-client-certificate/115957 "2026-06-15T01:34:22Z")
Hello, I have a question about OPC UA security (Client Security) in Ignition.Recently, I configured an OPC UA connection from Ignition to Kepware (KEPServerEX). After that, I checked the following page in the Gateway We… --- ## [Using SEL RTAC opc-ua server](https://forum.inductiveautomation.com/t/using-sel-rtac-opc-ua-server/114622)
**Author:** [@daniel.thomson1](https://forum.inductiveautomation.com/u/daniel.thomson1)\ **Replies:** 3\ **Last updated:** [June 2, 2026, 1:07pm UTC](https://forum.inductiveautomation.com/t/using-sel-rtac-opc-ua-server/114622 "2026-06-02T13:07:00Z")
Probing the hive mind here to see if anyone else has used one of the following with the OPC-UA feature and gotten a gateway to connect as a client, use it as an OPC UA server and browse tags on it? We know it is possible… --- ## [Troubleshooting OPC UA documents not being translated from binary to structure](https://forum.inductiveautomation.com/t/troubleshooting-opc-ua-documents-not-being-translated-from-binary-to-structure/115539)
**Author:** [@alke](https://forum.inductiveautomation.com/u/alke)\ **Replies:** 3\ **Last updated:** [May 14, 2026, 9:28pm UTC](https://forum.inductiveautomation.com/t/troubleshooting-opc-ua-documents-not-being-translated-from-binary-to-structure/115539 "2026-05-14T21:28:28Z")
I have a project using TwinCat 3 to ignition. Ultimately we need to get some data from an array of structures to a dataset, which lead me to finding that in modern OPC should be able to read those custom datatypes and th… --- ## [Live changes to OPC server causes reading errors](https://forum.inductiveautomation.com/t/live-changes-to-opc-server-causes-reading-errors/115268)
**Author:** [@akivabrookler](https://forum.inductiveautomation.com/u/akivabrookler)\ **Replies:** 1\ **Last updated:** [April 27, 2026, 5:07pm UTC](https://forum.inductiveautomation.com/t/live-changes-to-opc-server-causes-reading-errors/115268 "2026-04-27T17:07:48Z")
I am running an Ignition gateway connected to an opc server with opc tags. I have different opc tags configured for different possible tags the opc server may publish based on its configuration. When I switch the opc se… --- ## [Hypothetical specs for large OPC Ua server](https://forum.inductiveautomation.com/t/hypothetical-specs-for-large-opc-ua-server/115191)
**Author:** [@Ethan\_Brown](https://forum.inductiveautomation.com/u/Ethan_Brown)\ **Replies:** 0\ **Last updated:** [April 21, 2026, 10:51pm UTC](https://forum.inductiveautomation.com/t/hypothetical-specs-for-large-opc-ua-server/115191 "2026-04-21T22:51:21Z")
If I wanted to run a centralized server that has a handful of remote tag providers and I wanted to subscribe to several hundreds of thousands of tags from each of the tag providers, what kind of server specs do you think… --- ## [Writing multiple bits of Integer OPC tag at same time](https://forum.inductiveautomation.com/t/writing-multiple-bits-of-integer-opc-tag-at-same-time/115041)
**Author:** [@royd.van.doesburg](https://forum.inductiveautomation.com/u/royd.van.doesburg)\ **Replies:** 5\ **Last updated:** [April 13, 2026, 1:39pm UTC](https://forum.inductiveautomation.com/t/writing-multiple-bits-of-integer-opc-tag-at-same-time/115041 "2026-04-13T13:39:47Z")
Hello everyone, I’m trying to create a faceplate that works perfectly with our standardized PLC components in TIA portal. To prevent the need of a lot of communication tags with the HMI and other SCADA systems, all bits… --- ## [Tags from local KEPSERVEREX normally "Good" quality turns into "Bad\_Failure"](https://forum.inductiveautomation.com/t/tags-from-local-kepserverex-normally-good-quality-turns-into-bad-failure/114954)
**Author:** [@jmonteroh](https://forum.inductiveautomation.com/u/jmonteroh)\ **Replies:** 1\ **Last updated:** [April 8, 2026, 2:44pm UTC](https://forum.inductiveautomation.com/t/tags-from-local-kepserverex-normally-good-quality-turns-into-bad-failure/114954 "2026-04-08T14:44:20Z")
Hi all, We have an Ignition (8.1.29 (b2023070609) acting as a Historian connected locally (same server) as a client to KEPSERVEREX via OPC-UA channel. KEPSERVEREX is acting as a data hub, connecting to several devices … --- ## [OPC-UA VendorServerInfo in Ignition 8.3](https://forum.inductiveautomation.com/t/opc-ua-vendorserverinfo-in-ignition-8-3/114710)
**Author:** [@michael.flagler](https://forum.inductiveautomation.com/u/michael.flagler)\ **Replies:** 1\ **Last updated:** [March 27, 2026, 12:10am UTC](https://forum.inductiveautomation.com/t/opc-ua-vendorserverinfo-in-ignition-8-3/114710 "2026-03-27T00:10:38Z")
I'm working on migrating our standard project from 8.1 to 8.3 and as I was doing some of the diagnostics, I noticed that VendorServerInfo which used to work in 8.1 no longer works in 8.3 or something with my project brok… --- ## [Redundancy failover based on PLC communication loss and recovery](https://forum.inductiveautomation.com/t/redundancy-failover-based-on-plc-communication-loss-and-recovery/114629)
**Author:** [@a.moutska](https://forum.inductiveautomation.com/u/a.moutska)\ **Replies:** 3\ **Last updated:** [March 23, 2026, 9:11pm UTC](https://forum.inductiveautomation.com/t/redundancy-failover-based-on-plc-communication-loss-and-recovery/114629 "2026-03-23T21:11:49Z")
Hello everyone, I am using Ignition 8.3.4 with Perspective and a gateway redundancy architecture in Master/Backup mode. My setup is the following: \* Each gateway server has two network cards. \* One network card is de… --- ## [OPC-UA Server Loopback Connection Issue after Adding Additional Client](https://forum.inductiveautomation.com/t/opc-ua-server-loopback-connection-issue-after-adding-additional-client/114368)
**Author:** [@Felipe\_CRM](https://forum.inductiveautomation.com/u/Felipe_CRM)\ **Replies:** 9\ **Last updated:** [March 23, 2026, 3:48pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-loopback-connection-issue-after-adding-additional-client/114368 "2026-03-23T15:48:43Z")
We recently added another client to our Ignition OPC-UA server. We had some issues setting up the client which are already addressed in other posts but eventually they connected properly. A little while later we discove… --- ## [Two gateways with one showing connected OPC and the other shows FAULTED](https://forum.inductiveautomation.com/t/two-gateways-with-one-showing-connected-opc-and-the-other-shows-faulted/114604)
**Author:** [@chandler.livingston](https://forum.inductiveautomation.com/u/chandler.livingston)\ **Replies:** 0\ **Last updated:** [March 20, 2026, 7:49pm UTC](https://forum.inductiveautomation.com/t/two-gateways-with-one-showing-connected-opc-and-the-other-shows-faulted/114604 "2026-03-20T19:49:32Z")
Hello, I was curious if anyone has encountered something similar. I have two ignition servers. Server 1 is 8.1.20 and server 2 is on 8.1.36 (to make use of mitusbishi drivers). I noticed that the OPC UA connection is … --- ## [OPC Connection to EAE Soft dPAC via OPC-UA - toggles between connected and faulted](https://forum.inductiveautomation.com/t/opc-connection-to-eae-soft-dpac-via-opc-ua-toggles-between-connected-and-faulted/114247)
**Author:** [@AaronJust](https://forum.inductiveautomation.com/u/AaronJust)\ **Replies:** 16\ **Last updated:** [March 1, 2026, 11:23pm UTC](https://forum.inductiveautomation.com/t/opc-connection-to-eae-soft-dpac-via-opc-ua-toggles-between-connected-and-faulted/114247 "2026-03-01T23:23:51Z")
The connection I have above constantly toggles between connected and faulted and is generally unusable. The reported error is: io.netty.channel.AbstractChannel$AnnotatedNoRouteToHostException: No route to host: /17… --- ## [Trouble with Modbus Addressing within OPCUA Device Connections](https://forum.inductiveautomation.com/t/trouble-with-modbus-addressing-within-opcua-device-connections/114238)
**Author:** [@logan.h](https://forum.inductiveautomation.com/u/logan.h)\ **Replies:** 1\ **Last updated:** [February 27, 2026, 9:18pm UTC](https://forum.inductiveautomation.com/t/trouble-with-modbus-addressing-within-opcua-device-connections/114238 "2026-02-27T21:18:49Z")
After adding the unit (with correct IP) to the OPC Device Connections ( status is connected), I’m finding that no matter what address I put in, the quality is bad or UncertainInitialValue. Perhaps I’m misinterpreting th… --- ## [Fixing a 5-Hour OPC Timestamp Offset (PLC to Ignition)](https://forum.inductiveautomation.com/t/fixing-a-5-hour-opc-timestamp-offset-plc-to-ignition/114182)
**Author:** [@arice](https://forum.inductiveautomation.com/u/arice)\ **Replies:** 5\ **Last updated:** [February 26, 2026, 3:20pm UTC](https://forum.inductiveautomation.com/t/fixing-a-5-hour-opc-timestamp-offset-plc-to-ignition/114182 "2026-02-26T15:20:17Z")
I am experiencing a 5-hour time sync issue between a B&R PLC and an Ignition Perspective Gateway. Initially, a specific "Trigger Timestamp" tag was showing a 5-hour offset. To "fix" this, the HMI clock on the PLC was man… --- ## [Possible to read windows system event logs?](https://forum.inductiveautomation.com/t/possible-to-read-windows-system-event-logs/114118)
**Author:** [@mcl](https://forum.inductiveautomation.com/u/mcl)\ **Replies:** 7\ **Last updated:** [February 25, 2026, 1:32pm UTC](https://forum.inductiveautomation.com/t/possible-to-read-windows-system-event-logs/114118 "2026-02-25T13:32:54Z")
Since I’m asking this question is because, we are running our gateway in a VM machine on a hosted windows server, and when they do patching they do a snapshot of the VM. We also have PLC’s that communicate to our gatewa… [Next page](https://forum.inductiveautomation.com/tag/opcua/75.md?match_all_tags=true&page=1&tags%5B%5D=opcua)