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FANUC Controller
Program/G-code · Intermediate · 15-30 minutes
Fanuc Alarm 1097 - TOO LONG VARIABLE NAME
Fanuc Alarm 1097 occurs when a macro variable name exceeds the maximum character length permitted by the control system. This typically happens in custom macro programs using #variable naming or when user-defined macro variable names (accessible via SYSTEM > MACRO > COMMON VARIABLE) exceed system limits, which are typically 8 characters for local variables and 32 characters for common variables depending on control series.
1097
Fanuc Alarm 1097 - TOO LONG VARIABLE NAME
SYSTEM ALARM 1097
Fanuc alarm 1097: SYSTEM ALARM 1097. This alarm indicates a fault condition detected by the Fanuc control. Refer to the alarm number and name to identify the specific system or function involved.
Root Cause Summary
Fanuc Alarm 1097 occurs when a macro variable name exceeds the maximum character length permitted by the control system. This typically happens in custom macro programs using #variable naming or when user-defined macro variable names (accessible via SYSTEM > MACRO > COMMON VARIABLE) exceed system limits, which are typically 8 characters for local variables and 32 characters for common variables depending on control series.
Causes and Fixes
- 1
Access MDI or EDIT mode and locate the program line causing the alarm. The alarm typically displays the program number and sequence number where the error occurred.
- 2
Review all macro variable declarations in the program. Check #_variable names for length compliance: local variables max 8 characters, common variables typically max 32 characters (check Parameter 6031 for actual system limits on common variable names).
- 3
Shorten the variable name to meet system requirements while maintaining program logic. Example: change #_LONG_TOOLING_OFFSET_VALUE to #_TOOLOFS or use numbered variables like #500 instead of named variables.
- 4
Verify Parameter 6001 bit 0 (MACEX) is enabled to confirm macro executor capability. Reset alarm and test program execution in single block mode to verify correction.
Call a technician if:
- ·Parameter corruption suspected
- ·Multiple programs affected simultaneously
- ·System variable access issues persist
Prevention
- Establish variable naming conventions within 8-character limits
- Use program verification tools before transfer
- Regularly backup working programs
- Train programmers on FANUC macro variable limitations
Common Mistakes
- Using descriptive variable names from other CNC systems
- Not checking variable name length during program editing
- Copying variables from CAM post-processors without verification
- Mixing different CNC system variable naming conventions
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