Siemens SINUMERIK codes
AxisMD

axismd.ai

Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-40 minutes

Alarm 12270

Siemens 840D 12270 - Channel block macro identifier already defined

The name of the macro to be selected by the instruction DEFINE is already defined in the control as: Macro name Keyword Variable Configured identifier.

Siemens SINUMERIKServo/AxisIntermediate20-40 minutes

12270

Siemens 840D 12270 - Channel block macro identifier already defined

Channel block macro identifier already defined

The name of the macro to be selected by the instruction DEFINE is already defined in the control as: Macro name Keyword Variable Configured identifier.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Macro with identical name already exists in the control's memory or system library
  • Previous program run did not properly clear or unload macro definitions
  • Duplicate DEFINE statements within the same program or across loaded programs
  • Macro name conflicts with reserved keywords or system-defined identifiers
  • Corrupted or incompletely deleted macro definitions remaining in control memory

Troubleshooting Steps

  1. 1Review the active program listing and search for all DEFINE statements to identify duplicate macro names; rename the conflicting macro identifier to a unique name
  2. 2Check the macro library and system memory for pre-existing macro definitions matching the error identifier; delete or rename conflicting entries as needed
  3. 3Clear the control's macro memory by performing a selective reset or power cycle; reload only the required program without legacy macro definitions
  4. 4Verify that the macro name does not match reserved system keywords or NCK parameter names; consult the 840D/828D programming documentation for restricted identifiers
  5. 5If using multiple program files, ensure each macro DEFINE statement uses unique identifiers across all loaded programs; consolidate macro definitions into a single library file

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

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