PS0115

Review the faulting program line shown in the alarm display. Identify the variable number being accessed (e.g., #50000, #10, #95).

Navigate to SYSTEM > PARAM and check parameter 6001-6049 (macro variable settings). Verify parameter 6008 (number of additional macro variables) to confirm the total available extended user variables.

Verify the variable range: common variables #100-#199 and #500-#999 are standard; local variables #1-#33 are subroutine-specific; system variables #1000-#9999 are read-only or control-specific. Check Fanuc macro variable manual for your control series.

Correct the program to use valid variable numbers within the permitted range. If extended variables are needed, adjust parameter 6008 to allocate additional macro variable memory (requires control restart).

Changing parameter 6008 clears all existing macro variable data. Backup critical variable values before modification.

Identify the system variable number from the alarm message. Cross-reference with the Fanuc Macro Executor/Macro Compiler manual for your control series (0i-MF, 31i-B5, 32i-B, etc.) to verify the variable is supported.

Navigate to SYSTEM > PARAM and check parameter 6000-6049 range. Verify parameter 6004#0 (macro executor enable), parameter 6005 (external workpiece coordinate system settings), and other macro-related parameters are correctly configured.

Check if the system variable requires specific options (Custom Macro B, AI Nano, PMC Axis Control). Navigate to SYSTEM > MISC > OPTION to verify installed options match the requirements for the variable being accessed.

If attempting to write to a read-only system variable (e.g., current position variables #5021-#5030), modify the program logic to only read these values or use appropriate write-enabled variables.

Examine the program line for indirect addressing syntax such as #[expression]. Use MDI mode to check the current values of variables used in the calculation by entering G65 commands or viewing MACRO > VARIABLE screen.

Navigate to MACRO > VARIABLE screen (or SYSTEM > MACRO > VARIABLES depending on control series). Verify the values of all variables involved in the indirect address calculation are defined (not <null>) and produce a valid result.

Manually calculate the resulting variable number from the indirect expression. Ensure the result falls within valid ranges (#100-#199, #500-#999, or extended range). Check for uninitialized variables that default to <null> causing invalid addressing.

Add bounds checking in the macro program before indirect variable access. Initialize all index variables to known values at program start using #100=0 format to prevent null reference errors.