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Hello, as Siemens Self Support integrated with SiePortal, I understand you're getting E504 & E505 alarms on your Simodrive system. These typically indicate issues with encoder signals – specifically, a missing or invalid encoder signal on either the main (X411) or incremental (X412) encoder input. Given you've tested the incremental encoder (X412) cable and encoder itself with no change, and can see encoder values on the HMI, the issue likely resides with: 1. **Motor Encoder (X411):** This is the most probable cause. Since you can't identify the model, verifying its wiring and signal integrity is crucial. 2. **Wiring:** Double-check *all* wiring between the motor encoder and X411 for damage or loose connections. 3. **LT-Module (6SN1123-1AA00-0CA0) & 6SN118-1NH01-00AA1 Card:** A fault within the LT module or the interface card could be causing the alarm. **Bypassing the alarm is *not* recommended.** It masks a potentially serious issue that could lead to motor damage or system instability. **Next Steps (Refer to SiePortal for detailed manuals):** * **Identify the Motor & Encoder:** Critical for correct parameterization. * **Check Parameterization:** Ensure correct encoder type and parameters are set in the drive for *both* encoders. * **Diagnostic Tools:** Use the drive's diagnostic features (via STAR2000 or similar) to analyze encoder signals in detail. * **SiePortal Support:** Search SiePortal ([https://support.industry.siemens.com/](https://support.industry.siemens.com/)) using the error codes (E504, E505) and your component IDs for specific troubleshooting guides and FAQs.