Protocols

IEC 61131-3

The PLC programming-language standard: structured text, ladder, function block, and vendor dialects such as Siemens SCL and Rockwell structured text. This is a language family, not a field bus. A tool tagged here generates or explains controller code.

Open these 17 in the directory

• Agents4PLCOpen sourceNot a field writerMulti-agent research framework and a verifiable Structured Text benchmark with formal specs and reference code.
• AutoFactory-BenchFreeNot a field writerClosed-loop benchmark: agents write one Structured Text file for 100 factory tasks and a simulator grades success and safety.
• Automation Studio CoPilotPaidInside the IDEB&R coding assistant inside Automation Studio Code that turns natural-language prompts into Structured Text.
• AutoPLCOpen sourceNot a field writerResearch generator for vendor-specific Structured Text, evaluated on Siemens SCL and CODESYS with a compiler in the loop.
• CODESYS Development System MCP ServerPaidInside the IDEOfficial CODESYS add-on that lets an MCP client read and write the open project, compile, and fix Structured Text.
• Copia AIPaidInside the IDEPaid copilot for Rockwell and Siemens projects stored in Copia: code help, documentation, and change summaries.
• Eigen Engineering AgentPaidInside the IDESiemens agent connected to TIA Portal that executes engineering tasks in the open project, then checks its own result.
• FactoryTalk ConductorPaidInside the IDEAnnounced AI orchestration layer that coordinates agents and workflows across Rockwell engineering tools.
• FactoryTalk Design Studio CopilotPaidInside the IDEGenerative assistant inside FactoryTalk Design Studio for Logix code, explanations, device changes, and project questions.
• LADXOpen sourceNot a field writerFree, open PLC workbench in the browser: ladder and structured text, a checker, and a virtual PLC. No live download.
• LLM4PLCOpen sourceNot a field writerResearch pipeline that loops an LLM with grammar checks, a compiler, and an SMV verifier to produce Structured Text.
• PLCcode.aiPaidNot a field writerPaid browser workspace for Studio 5000 L5X and L5K projects, with AI grounded in the open project.
• PLCWorldOpen sourceNot a field writerResearch benchmark of 100 Structured Text tasks graded in closed loop, with task success and safety reported separately.
• Schneider Industrial CopilotPaidInside the IDEPLC code assistant embedded in EcoStruxure Automation Expert. Schneider does not sell it as a standalone product.
• Siemens Industrial Copilot for TIA PortalPaidInside the IDEEarlier Siemens assistant for SCL generation, code explanation, WinCC Unified drafts, and natural-language manual search.
• TwinCAT CoAgentPaidInside the IDEBeckhoff multi-agent assistant for TwinCAT engineering, built as an MCP client with a choice of cloud or local models.
• twincat-mcpOpen sourceWrites gatedUnofficial MCP server over the TwinCAT Automation Interface and ADS: build, deploy, read, and write.