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PLC Cloud Sim — LAD/SCL simulation over MCP

Official registry Other

Cloud PLC simulator: validate and step-run LAD/SCL programs, run scenarios, return PASS/FAIL.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http plc-cloud-sim-lad-scl-simulation-over-mc 'https://tia.hubwiz.com/sim/mcp' --header 'Authorization: <Bearer API key from https://tia.hubwiz.com/sim, format '\''Bearer sim_live_...'\''. WeChat login issues a free key with 100 calls; top-ups are 1000 calls for ¥9.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "plc-cloud-sim-lad-scl-simulation-over-mc": {
            "type": "http",
            "url": "https://tia.hubwiz.com/sim/mcp",
            "headers": {
                "Authorization": "<Bearer API key from https://tia.hubwiz.com/sim, format 'Bearer sim_live_...'. WeChat login issues a free key with 100 calls; top-ups are 1000 calls for ¥9.>"
            }
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. PLC Cloud Sim — MCP server for LAD / SCL simulation
  2. What it does
  3. Quick start
  4. Pricing
  5. Notes

PLC Cloud Sim — MCP server for LAD / SCL simulation

Cloud PLC simulator over MCP by 汇智网 (hubwiz.com). Validate and step-run Ladder (LAD) and SCL programs, run scenario acceptance, get a PASS/FAIL report — without installing TIA Portal.

This repository is documentation and client configuration only. The simulator runs as a hosted service at tia.hubwiz.com; its implementation is not open source.

  • Endpoint: https://tia.hubwiz.com/sim/mcp
  • Transport: Streamable HTTP (stateless, POST JSON-RPC)
  • Auth: Authorization: Bearer sim_live_… (the X-API-Key header is also accepted)
  • Dashboard / API keys: https://tia.hubwiz.com/sim
  • Registry entry: io.github.tia-forge/plc-cloud-sim (official MCP Registry)

What it does

ToolPurpose
lad_validateValidate one or more LadDoc ladder documents
lad_simulateRun scan cycles with given inputs, read back variables and diagnostics
lad_run_scenarioRun a declarative scenario (cases / exhaustive matrix / seeded fuzz / always invariants)
scl_validateParse and validate SCL source
scl_simulateStep-run SCL across scan cycles and read variables back
scl_run_scenarioRun a declarative SCL scenario

Semantics match a real PLC scan: contacts, coils, timers/counters, FC/FB calls, jumps, and IF/CASE/FOR/WHILE for SCL. Execution is deterministic and reproducible — the same input yields the same result, so a scenario is usable as a regression test.

Quick start

Claude Code
claude mcp add --transport http sim-cloud https://tia.hubwiz.com/sim/mcp \
  --header "Authorization: Bearer sim_live_YOUR_KEY"
claude mcp list
Cursor / VS Code / any JSON-configured client
{
  "mcpServers": {
    "sim-cloud": {
      "url": "https://tia.hubwiz.com/sim/mcp",
      "headers": { "Authorization": "Bearer sim_live_YOUR_KEY" }
    }
  }
}
Ask the agent for something
Validate this SCL block, then run it for two scans with Start=false then Start=true,
and tell me the final value of Motor.

Pricing

  • WeChat login on the dashboard issues a key immediately: 100 calls free, no signup form.
  • Top-ups: 1000 calls for ¥9, one-off — no subscription, no monthly fee.
  • Handshake requests (initialize, tools/list) are free; each tools/call costs 1 call.

Notes

  • No TIA Portal installation is required — the program text (LadDoc / SCL) is sent to the service. If your policy forbids uploading program text, use an on-premises path instead (see TiaLink for the on-machine gateway).
  • Related services: LadDoc Cloud (LadDoc → SimaticML), TIA Portal ladder examples.
  • Documentation license: CC BY 4.0. "TIA Portal", "SIMATIC" and "S7" are trademarks of Siemens AG; this service is an independent third-party tool, not affiliated with or endorsed by Siemens.

Frequently asked questions

What is PLC Cloud Sim — LAD/SCL simulation over MCP?

Cloud PLC simulator: validate and step-run LAD/SCL programs, run scenarios, return PASS/FAIL.

How do I install PLC Cloud Sim — LAD/SCL simulation over MCP?

It runs as a remote server. In Claude Code: claude mcp add --transport http plc-cloud-sim-lad-scl-simulation-over-mc 'https://tia.hubwiz.com/sim/mcp' --header 'Authorization: <Bearer API key from https://tia.hubwiz.com/sim, format '\''Bearer sim_live_...'\''. WeChat login issues a free key with 100 calls; top-ups are 1000 calls for ¥9.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does PLC Cloud Sim — LAD/SCL simulation over MCP need an API key?

Yes. It expects Authorization, which you set in its configuration.

Is PLC Cloud Sim — LAD/SCL simulation over MCP open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains PLC Cloud Sim — LAD/SCL simulation over MCP?

It is published by tia-forge. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.