Plcs Ai MCP server

What it does

PLCs.ai MCP server exposes 17 tools that give MCP-compatible AI agents access to PLC projects (Allen-Bradley Studio 5000, Siemens TIA Portal, CODESYS V3), live tag values, and project analyses hosted on PLCs.ai. It is aimed at PLC engineers and developers who want to query, troubleshoot, and propose code changes for industrial control projects from within AI coding tools like Claude, Cursor, or Codex.

• Query live tag values and tag history from a connected PLC to diagnose why a machine stopped or misbehaved.
• Ask the PLCs.ai assistant a natural-language question about a project and receive a cited answer, such as tracing interlocks to find why a conveyor won't restart.
• Draft a code change proposal for a missing handshake or dead-code issue identified in the project analysis, review it, then save it as a new version.

Tools this server exposes

Tool	Does
plcs_health	Check the health and availability of the PLCs.ai MCP service.
plcs_list_projects	List all PLC projects accessible to the authenticated organization.
plcs_get_project	Retrieve metadata and details for a specific PLC project.
plcs_get_project_source	Fetch the source content of a PLC project.
plcs_ask_project	Ask a natural-language question about a project and receive a cited answer from the PLCs.ai assistant.
plcs_get_live_values	Read current live tag values from a connected PLC.
plcs_get_tag_history	Retrieve historical values for a specific tag over a given time range.
plcs_request_live_tags	Request that specific tags be made available for live data collection.
plcs_get_project_analysis	Fetch the latest analysis of a project, covering dead code, race conditions, interlocks, cycle-time bottlenecks, and signal tracing.
plcs_propose_code	Generate a reviewable code change proposal; nothing is persisted without a separate approval step.
plcs_save_version	Save a reviewed proposal as a new version of the project.
plcs_stage_upload	Stage a project upload in preparation for committing a new version.
plcs_export_plc	Initiate an export of a PLC project in its native format.
plcs_export_pdf	Initiate a PDF export of a PLC project.
plcs_get_export	Check the status or metadata of a previously initiated export.
plcs_download_export	Download the file produced by a completed export job.
plcs_mint_embed_token	Generate a short-lived, read-only, project-scoped token for embedding a project view in an iframe.

Before you enable it

An MCP server runs with whatever access you give it. Start with a development account rather than production, and check which tools the server exposes before you let an agent call them unattended.