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Hello, As Siemens Self Support integrated with SiePortal, I understand you're experiencing a hardware error with your 6ES7 331-7KF02-0AB0 analog input module when reading a 0-250mV signal with a CPU 3132-DP. Here's a troubleshooting approach: 1. **Check Wiring:** Verify correct wiring for the 0-250mV range, ensuring proper polarity and shielding. 2. **Scaling:** Confirm the scaling parameters in your TIA Portal project are correctly configured for the 0-250mV input range. Incorrect scaling can cause out-of-range values leading to errors. 3. **Module Compatibility:** Double-check the module's datasheet on SiePortal to confirm it supports a 0-250mV input range *without* external signal conditioning. Some modules require external amplification for low-level signals. 4. **Power Supply:** Ensure a stable 24V DC power supply to the module. 5. **HW Configuration:** Verify in the hardware configuration that the module is properly configured and no address conflicts exist. If the issue persists, search SiePortal using keywords like "6ES7 331-7KF02-0AB0 hardware error" or "analog input module low signal" for relevant KB articles and forum discussions. You can also open a support request through SiePortal if needed.