The other versions are expected to work because Openness keeps its APIs backward compatible, which is an honest statement of what has and hasn't been exercised. Live values come through a separate S7CommPlus bridge shipped inside the download — that is how the diagnostics tool can report a CPU's actual RUN or STOP state, which the engineering API does not expose at all.
A Windows MCP server that reaches TIA Portal through the Openness API: 18 tools with 205 actions across PLC programming, project management, library operations, hardware configuration, cross-reference analysis and deployment.
- Blocks read and written — `blocks_read` (16 actions) lists, exports and compiles; `blocks_write` (24) creates FBs, FCs and OBs and edits interfaces, networks and rungs
- `db` (11 actions) for data blocks, including reading and writing start values at any depth in nested multi-instance structures
- `tag` (13), `udt` (11), `alarm_text` (15) and `watch` (14) for tags, user-defined types, alarm texts and watch or force tables
- `hardware` (14) and `library` (25) for hardware configuration and library management
- `diagnostics` (7) and `download_upload` (4) — go online, compare the project against the PLC, scan the network for reachable controllers, download
- `live_data` (11) reads data blocks, tag tables, watch tables and CPU diagnostics from the running controller
- `xref` (6) for cross-references, `folders` (5) for the project tree, `session` (16) and `admin` (13) for exports, call statistics and recent errors
Windows with .NET Framework 4.8, and TIA Portal V17 to V20 installed — V16 and older are detected and refused with a message. Download the portable release for version 3.15.2 and point your client at `C:\TiaCommander\TiaCommander.exe` over stdio, or add it in one line with `claude mcp add --transport stdio --scope user tiacommander`. Protocol: MCP 2024-11-05.