TIA Portal MCP server (TiaMcpServer)

MCP serverCommunity

A .NET tool that reads and edits a running TIA Portal V21 project through Openness, with dry-run previews for every write. By Czarnak.

113 starsUpdated 4 days agoGitHub data from 5 Nov 2026

At a glance

Reads PLC blocks, PLC data types and tag tables (as SimaticML XML, or as source text for SCL blocks, global DBs and UDTs) and the cross-references of any block, tag or folder.
Writes PLC software in batches of up to 50 operations: block and type content, blocks, groups, tag tables, tags and user constants, with a content hash that rejects edits to a block changed since it was read.
Reads hardware configuration with I/O addresses matched to PLC tags, searches the hardware catalogue, adds devices and edits subnets and PROFINET settings.
Inspects and edits WinCC Unified HMI tag tables, tags and alarms, works with Version Control Interface workspaces, and compiles a PLC or block and returns compiler messages.
Three access modes: read-only (8 tools), read-write (19 tools, one confirmation per project lifecycle call) and full; every write is logged to an audit file.

Windows only, TIA Portal V21 only, and your Windows user must be in the Siemens TIA Openness group.
Batch writes stop at the first failure without rolling back earlier items, so re-read before retrying.
No PLC run/stop or download; Classic WinCC devices are listed but not read.

dotnet tool install -g TiaMcpServer
tia-mcp doctor
tia-mcp install claude-code

MCP servers and skills run code on your computer. Review the source before installing.

AI-generated models, drawings and results must be checked by a qualified engineer before use.