--- title: OPC-DA Collector slug: changelog/opc-da-collector docTags: createdAt: 2025-12-23T08:32:18.728Z --- :::hint{type="warning"} Always check the compatibility matrix below before installing a new version. ::: ## Compatibility Collectors of all versions >= v1.0.0 are compatible with all Factry Historian versions >= v4.0.0, in both directions. However, for certain functionalities, certain minimum versions of the collector and Factry Historian are required. More information is always available in the release notes. ### Feature Compatibility Matrix This is the compatibility matrix for version listed on this page. If you have downloaded a newer version than the one listed on this page please check the release notes of that version. | Feature | OPC-DA Collector Version | Factry Historian Version | | --------------------- | ------------------------ | ------------------------ | | Collector Auto Update | >= v1.2.0 | >= v6.4.0 | | Windows 7, 8 support | \< v2.0.0 | / | | Data compression | >= v3.1.0 | / | ## v3.1.3 Released on 16/07/2026 ### Changes - Updated the base collector to v3.5.3 ### Bug fixes - Fixed a crash that could occur when measurements were added, updated, or retried while the collector was polling. - Fixed a crash when polling a set of items that were all unknown to the OPC-DA server. - Fixed a case where the collector could keep reporting healthy while no longer collecting data after the OPC-DA server dropped the connection without closing it; this is now detected and the collector reconnects. - Measurements configured with a negative collection interval are now rejected instead of being registered but never collected. - Fixed a failover collector silently failing to connect after taking over. A connection failure is now reported in the logs and the collector health on every activation, even when the same error was already seen before. ## v3.1.2 Released on 22/01/2026 ### Changes :::Paragraph{listStyleType="disc" indent="2"} [Updated the base collector to v3.5.2](docId\:dJs1GFlKyD1m31dXQH5CU) ::: ## v3.1.1 Released on 12/12/2025 ## Bug fixes - Fixed deadlock that caused OPC-DA connection to hang when creating groups ## v3.1.0 Released on 5/12/2025 ### Improvements - Updated to base collector from v3.3.1 to v3.5.1 - \[Base collector]: Add `TimeoutGracePeriod` setting to configure how long the collector should wait before forcefully terminating operations during shutdown - \[Base collector]: Add `Swinging Door` and `Noise Filter` compression methods ### Bug fixes - \[Base collector]: Added a workaround for Windows systems to avoid issues with log messages being overwritten in Factry Historian due to time precision limitations. ## v3.0.0 Released on 18/11/2025 ### Improvements - Migrated collector to new more performant OPC-DA library - Collector now uses bulk OPC-DA API calls, improving startup performance - Added support for 64-bit Windows ### Removed - Support for multiple OPC-DA servers has been removed. Because of this, the `Nodes` setting has been changed to `Node`. ## v2.0.4 Released on 24/09/2025 ### Bug fixes - Fixed an issue where deleted measurements were still being reinitialized if they were marked invalid while being initially added ## v2.0.3 Released on 05/09/2025 ### Bug fixes - Fixed a recursion issue when pausing or deleting measurements - Fixed min max values of CollectionInterval and CollectionOffset in the measurement settings ## v2.0.2 Released on 20/08/2025 ### Bug fixes - Fixed an issue where having active measurements with invalid item ID's could cause the the collector to stop collecting data ## v2.0.1 Released on 01/07/2025 ### Bug fixes - Fixed an issue where the collector would send the "debug" as version instead of the correct version to historian ## v2.0.0 Released on 23/05/2025 ### Changes - [Updated the base collector to v3.1.1](docId\:dJs1GFlKyD1m31dXQH5CU) and thus dropped support for Windows 7 and 8 ## v1.3.3 Released on 29/04/2025 ### Bug fixes - Fixed failover collector and main collector both collecting in some cases ## v1.3.2 Released on 29/01/2025 ### Changes - Disabled streaming until a data loss fix is implemented - [Updated the base collector to v2.7.3](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.3.1 Released on 02/01/2025 ### Changes - [Updated base collector to v2.7.1](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.3.0 Released on 03/10/2024 ### Changes - [Updated base collector to v2.6.0](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.2.2 Released on 07/06/2024 ### Changes - Added support for performance monitoring with Pyroscope ### Bug fixes - Restored windows 7 compatibility - [Updated base collector to v2.4.8](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.2.1 ### Changes - Fixed a bug where the collector would not pause a measurement - [Updated base collector to v2.4.3](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.2.0 ### Changes - Added support for auto-updating. Requires historian server >= v6.4.0 - [Updated base collector to v2.4.0](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.1.12 ### Changes - [Updated the base collector to v1.2.18](docId\:dJs1GFlKyD1m31dXQH5CU) - Add possibility to escape non-printable characters in read strings - Add a liveness check to the collector that checks the opc server's timestamp to determine the health of the connection ## v1.1.11 ### Changes - [Updated the base collector to v1.2.13](docId\:dJs1GFlKyD1m31dXQH5CU) - Set collector health to `Initializing collector` when adding measurements initially ### Bug fixes - Measurements with a CollectionInterval under the minimum are not polled - Collector health was bad for failover collector when closing client after returning to `Idle` ## v1.1.10 ### Changes - [Updated the base collector to v1.2.12](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.1.9 ### Changes - [Updated the base collector to v1.2.9](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.1.8 ### Changes - [Updated the base collector to v1.2.8](docId\:dJs1GFlKyD1m31dXQH5CU) ## v1.1.7 ### Bug fixes - Fixed crash if buffer path could not be opened - Collector no longer tries to register collector if historian API is unavailable ## v1.1.6 ### Changes - Added connection monitoring to the OPC-DA client. This should resolve the issue of the collector not starting after the initial connection attempt fails. ## v1.1.0 \{\{\< notice warning "Watch out!" >}} When updating to this version keep in mind that environment variables that had a different value will need to be set in the Historian. \{\{\< /notice >}} ### Changes - Added first version of OPC-DA documentation - Changed most environment variables to be configured as advanced collector settings in the Historian.