What causes Siemens SINUMERIK alarm 380051?

Encoder cable damaged or connector loose at drive or encoder end. Encoder signal amplitude below minimum specification — contamination or cable issue. SSI or EnDat measuring system communication fault. Encoder supply voltage out of specification. Measuring system hardware failure.

How do I fix Siemens SINUMERIK alarm 380051?

1. Check encoder/measuring system cable for damage and reseat connectors. 2. Clean the measuring system reading head and scale if contamination is present. 3. Verify encoder supply voltage at the connector. 4. Check SINAMICS drive diagnostics for detailed fault sub-codes. 5. Replace encoder cable first; replace sensor head if cable checks out.

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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 380051

Siemens 840D 380051 - Profibus-DP: multiple assignment of outputs on address

This alarm occurs due to multiple assignments of output data at the same logical address in the Profibus-DP configuration. Fix by identifying and correcting the duplicate address assignment in the program or configuration.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

380051

Siemens 840D 380051 - Profibus-DP: multiple assignment of outputs on address

Profibus-DP: multiple assignment of outputs on address

Root Cause Summary

This alarm occurs due to multiple assignments of output data at the same logical address in the Profibus-DP configuration. Fix by identifying and correcting the duplicate address assignment in the program or configuration.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
SAFETY: Power down and lock out system
Follow LOTO procedures before making any program changes. Ensure system is in safe state.
2
Check alarm details
Note the logical address (%1) mentioned in the alarm message.
3
Review program/configuration
Search the program or Profibus-DP configuration for duplicate assignments to the specified address.
4
Correct assignment
Modify the program or configuration to ensure unique address assignments.
5
Validate changes before restart
Verify all safety circuits and emergency stops function properly before returning to operation.

Service Recommendedmedium confidence

Call a technician if:

·If you are not trained in Siemens programming and safety procedures
·If unable to locate duplicate assignments after thorough review
·If alarm persists after configuration changes
·If any safety-critical outputs are involved in the address conflict

Prevention

Validate Profibus-DP address assignments during programming
Use simulation to detect configuration errors before execution

Common Mistakes

Overlooking address conflicts in subprograms
Misinterpreting the logical address in the alarm message

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Always verify with your machine manual or a certified technician before performing service procedures.