Siemens SIMATIC AX WinCC Unified Elements Brings IT-Style DevOps to PLC and HMI Engineering
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Siemens SIMATIC AX WinCC Unified Elements Brings IT-Style DevOps to PLC and HMI Engineering
, Siemens has released SIMATIC AX WinCC Unified Elements, a next-generation engineering application that extends the company's SIMATIC AX portfolio beyond PLC programming into full-scale HMI visualization development. The launch represents one of the most significant architectural shifts in industrial automation tooling in recent years: for the first time, control logic and human-machine interface
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The global IT/OT convergence market was valued at USD 50 billion in 2024 and is projected to reach USD 101.91 billion by 2030 (CAGR 12.6%). Siemens' move to collapse PLC and HMI engineering into a unified, Git-driven toolchain directly targets the industry's most persistent pain point: the walled-garden separation between control logic and its operator interface , a fragmentation that has historically slowed project delivery, complicated collaboration, and made version control an afterthought rather than a native capability.
When Siemens introduced SIMATIC AX, the pitch was compelling: bring modern software development practices , Git version control, unit testing, CI/CD pipelines, and package management , to PLC programming. But there was a glaring omission. Engineers still had to switch back to TIA Portal for any HMI development. Screens remained locked inside binary project files, resistant to diffing, branching, or merge-request workflows.
WinCC Unified Elements closes that gap. Engineers can now design HMI screens through two complementary paths: a visual editor familiar to TIA Portal veterans, or entirely in code using YAML , a human-readable data serialization format. The latter option means every faceplate, every tag binding, and every screen layout can be version-controlled alongside the PLC's Structured Text logic in a single Git repository.
Manufacturing faces a well-documented engineering workforce shortage. By adopting VS Code , the world's most popular code editor , and supporting YAML-based screen definitions, Siemens lowers the barrier for software engineers transitioning into industrial automation. A developer who knows Git, YAML, and VS Code can contribute to HMI projects without years of proprietary tooling experience. This design choice is as much about talent acquisition as it is about engineering efficiency.
Engineers can toggle between a graphical screen builder and a text-based YAML editor. Every visual change generates clean YAML code , and vice versa. This bidirectional fidelity means the project is always diffable, always reviewable, and always ready for automated testing pipelines.
Git is not bolted on; it is embedded. Teams can branch, commit, review pull requests, and merge visualization changes with the same discipline applied to PLC code. One commit can span a tag pragma change in the PLC and the corresponding binding update in the HMI , delivering a genuine single-source-of-truth for the entire automation project.
The IDE is built on the Open VSX marketplace, allowing engineers to customize their development environment with community and Siemens-authored extensions. New features arrive as background updates without forced upgrades or additional licensing costs , a model familiar to software developers but rare in industrial engineering tools.
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