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EPICS MCP Server

EPICS MCP Server

Public
Jacky1-Jiang/EPICS-MCP-Server

Python-based MCP server enabling seamless interaction with EPICS process variables by retrieving, setting, and fetching detailed PV information through Model Context Protocol for efficient control system integration.

python
0 tools
May 29, 2025
Updated Jun 4, 2025

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EPICS-MCP-Server

Overview

  • The EPICS MCP Server is a Python-based server designed to interact with EPICS (Experimental Physics and Industrial Control System) process variables (PVs). It provides a set of tools to retrieve PV values, set PV values, and fetch detailed information about PVs. The server is built using the mcp framework and communicates over stdio, making it suitable for integration into larger control systems or workflows.

  • This tool is particularly useful in environments where EPICS PVs are used for monitoring and controlling hardware or software parameters.

Features

  • The EPICS MCP Server provides the following tools:
  1. get_pv_value

    • Create or update a single file in a repository
    • Inputs:
      • pv_name (string): The name of the PV variable.
    • Returns: A JSON object containing the status (success or error) and the retrieved value or an error message.
  2. set_pv_value

    • Set a new value for a specified PV.
    • Inputs:
      • pv_name (string): The name of the PV variable.
      • pv_value (string): The new value to be set for the PV.
    • Returns: A JSON object containing the status (success or error) and a confirmation message or an error message.
  3. get_pv_info

    • Fetches detailed information about a specified PV.
    • Inputs:
      • pv_name (string): The name of the PV variable.
    • Returns: A JSON object containing the status (success or error) and the detailed information about the PV or an error message.

Usage with Langchain

  • To use this with Langchain, you must install the dependencies required for the project.
pip install -r requirements.txt
  • Langchain

server_params = StdioServerParameters( command="python", # Make sure to update to the full absolute path to your math_server.py file args=["/path/server.py"], )
  • EPICS

  • Before using the EPCIS mcp server, you must successfully install EPCIS on your local machine, ensure that IOC can start normally, and verify that functions such as caget, caput, and cainfo are working properly. For detailed installation instructions, please refer to https://epics-controls.org/resources-and-support/base/.
jiangyan@DESKTOP-84CO9VB:~$ softIoc -d ~/EPICS/DB/test.db Starting iocInit ############################################################################ ## EPICS R7.0.8 ## Rev. 2025-02-13T14:29+0800 ## Rev. Date build date/time: ############################################################################ iocRun: All initialization complete epics>
jiangyan@DESKTOP-84CO9VB:~$ caget temperature:water temperature:water 88 jiangyan@DESKTOP-84CO9VB:~$ caput temperature:water 100 Old : temperature:water 88 New : temperature:water 100 jiangyan@DESKTOP-84CO9VB:~$ cainfo temperature:water temperature:water State: connected Host: 127.0.0.1:5056 Access: read, write Native data type: DBF_DOUBLE Request type: DBR_DOUBLE Element count: 1

Test Result

  • Mcp client:
async def run(): async with stdio_client(server_params) as (read, write): async with ClientSession(read, write) as session: # Initialize the connection await session.initialize() # Get tools tools = await load_mcp_tools(session) # Create and run the agent agent = create_react_agent(model, tools) agent_response = await agent.ainvoke({"messages": "To query the value of a PV (Process Variable) named temperature:water"}) return agent_response )
  • Result:
================================ Human Message ================================= To query the value of a PV (Process Variable) named temperature:water ================================== Ai Message ================================== Tool Calls: get_pv_value (call_vvbXwi51CyYUxEM0hcyvCFCY) Call ID: call_vvbXwi51CyYUxEM0hcyvCFCY Args: pv_name: temperature:water ================================= Tool Message ================================= Name: get_pv_value { "status": "success", "value": 88.0 } ================================== Ai Message ================================== The current value of the PV named `temperature:water` is 88.0.
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