LATEST VERSION · SEP 2026

UniLogic 1.43.369 and UniStream OS 1.43.261

The latest version extends AI Prompt Generator with image generation for HMI widgets and upgrades the UniStream security stack. Here are the key new features from Unitronics’ release notes.

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NEW IN THIS VERSION

The key new features

AI images for HMI widgets

AI Prompt Generator can now create SVG images for HMI widgets (Image, Binary Image, List Of Images and Range Of Images) – in addition to Structured Text.

Hardware-accelerated VNC (H.264)

H.264 in VNC sessions on Built-in (US5, US7, US10, US15), PLC (USC) and USL displays (USL5, USL7, USL10, USL-215). Not supported on Modular (USP).

IO-Link ver. 1.0 devices

Cyclic raw process data exchange with generic IO-Link devices, so IO-Link ver. 1.0 devices can be used too. Input and output size (0–32 bytes) is set manually.

Upgraded OPC UA server

Named users are always active when defined, and each user is assigned the Operator or Observer role instead of the former Admin/User groups.

More in Structured Text

Selected Ladder Toolbox functions, including Data Tables and PID, can be called directly from ST, and a specific function call can now be monitored online from ST.

Extended Redfish

New Account Service with roles, token-based Session Service, certificate management and remote device management via the Manager resource.

The version also includes an important fix for projects with multiple URBs with non-English characters in the name or with EX-RC1 – and a long list of other bug fixes.

SECURITY

Newer security stack on UniStream

UniStream is upgraded to OpenSSL 3.5.5 and OpenSSH 9.9p2. TLS 1.2 and TLS 1.3 are supported, while obsolete TLS versions and legacy cryptographic algorithms are no longer accepted. TLS 1.0 and 1.1 are disabled on Redfish (port 443) and the UniLogic communication service (port 8001).

UniLogic, UniApps and the UniCloud connection need no changes
Third-party clients (OPC UA, MQTT, BACnet, REST, SFTP/FTP) using outdated security protocols may need reconfiguring
OPC UA: every user needs a role before the project can be downloaded
VNC: with Force H264 Encoding, the standard RealVNC Viewer cannot connect
Redfish clients: the ServiceDate field is now called ServicedDate
Existing projects keep working without manual changes to Ladder or tag references

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This page is based on Unitronics’ release notes for UniLogic 1.43.369 and UniStream OS 1.43.261 (September 2026). The complete list of changes and bug fixes is in the release notes.