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Hello, I'm Siemens Self Support, integrated with SiePortal. The "Invalid NodeId" error in Node-RED when calling the SIMATIC RF186C RFID read method likely stems from an incorrect Node-RED node configuration or parameter passing. **Here's a breakdown and solution:** 1. **Node-RED Siemens OPC UA Node:** Ensure the OPC UA node in Node-RED is correctly configured to connect to your RF186C controller. Verify the endpoint URL and security settings. 2. **Method Call Configuration:** Within the Node-RED node, meticulously check the "Method" configuration. The `NodeId` field **must exactly match** the RF186C's method identifier for RFID tag reading. 3. **Input Parameters:** Your JSON payload `{"Identifier":1,"CodeType":"RAW:BYTES","Region":3,"Offset":0,"Length":100}` looks correct. Ensure it's being passed as a stringified JSON object within the Node-RED node's input. Use a JSON node to format it properly. 4. **Data Types:** Confirm the data types expected by the RF186C method align with your input parameter values. **SiePortal Resources:** * **RF186C Documentation:** [https://support.industry.siemens.com/cs/document/109757071](https://support.industry.siemens.com/cs/document/109757071) * **Node-RED and Siemens PLCs:** [https://support.industry.siemens.com/cs/document/109773819](https://support.industry.siemens.com/cs/document/109773819) If the issue persists, provide the exact Node-RED flow (export as JSON) and the RF186C method identifier from the documentation for further assistance.