Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Overtravel/Limit · Intermediate · 30-120 minutes

Alarm 26006

Siemens 840D 26006 - Axis encoder encoder type/output type not possible

ALARM 26006 fires when the encoder type configured in MD 30240 (ENC_TYPE) or the control output type in MD 30130 (CTRLOUT_TYPE) is incompatible with the 840D controller. The 840D supports only three encoder types (Simulation, Signal Generator, Square-wave) and one output type (Standard), whereas unsupported encoder configurations trigger this mismatch alarm.

Siemens SINUMERIKOvertravel/LimitIntermediate30-120 minutes

26006

Siemens 840D 26006 - Axis encoder encoder type/output type not possible

Axis encoder encoder type/output type not possible

Siemens SINUMERIK alarm 26006: Axis encoder encoder type/output type not possible. This alarm indicates a fault or error condition on the SINUMERIK 840D control. Refer to the Siemens SINUMERIK alarm documentation for the complete description and remedy.

Root Cause Summary

ALARM 26006 fires when the encoder type configured in MD 30240 (ENC_TYPE) or the control output type in MD 30130 (CTRLOUT_TYPE) is incompatible with the 840D controller. The 840D supports only three encoder types (Simulation, Signal Generator, Square-wave) and one output type (Standard), whereas unsupported encoder configurations trigger this mismatch alarm.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Access SIEMENS HMI or Operate panel → Diagnosis → Alarms to confirm ALARM 26006 references Axis %1 and Encoder %2.

  2. 2

    Navigate to NCK → Machine Data → Axis [n] → Encodings in SINUMERIK Operate or use Service Software. Locate MD 30240 (ENC_TYPE) for the faulted axis.

  3. 3

    Change MD 30240 to one of: 0=Simulation (for commissioning), 1=Signal Generator (external waveform), or 2=Square-wave encoder (TTL/HTL incremental). Verify the physical encoder connected matches the selected type.

    Changing ENC_TYPE requires axis re-initialization; plan downtime accordingly.

  4. 4

    Save machine data (MD store) via NCK menu and perform a warm restart (IPL) to apply the corrected encoder configuration.

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