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Access machine parameters

Press MOD key, select 'Machine Parameters' and navigate to MP100-MP199 axis configuration parameters to verify actual axis count.

Check MP110 (number of axes) first as this is the master axis count parameter

Check PLC configuration file

Access Setup menu → PLC → Configuration and verify AXIS_COUNT constant matches the MP110 value exactly.

Do not modify PLC configuration without proper backup

Correct and recompile

Update AXIS_COUNT to match MP110, save configuration, and restart PLC compiler from Setup → PLC → Compile PLC program.

Always perform a complete PLC compilation after changing configuration constants

Verify channel configuration

Check MP20010 (number of channels) in machine parameters to determine actual channel count configured in TNC.

Most standard mills have 1 channel, while multi-channel machines may have 2-4

Compare PLC configuration

Navigate to Setup → PLC → Configuration and verify CHANNEL_COUNT matches MP20010 value.

Incorrect channel count can cause program execution errors

Update and validate

Correct CHANNEL_COUNT value, save configuration, and perform PLC compilation test from Setup → PLC menu.

Check PLC compilation log for any remaining configuration errors

Check spindle parameters

Review MP3010 (number of spindles) and MP3011-MP3019 spindle configuration parameters to verify actual spindle count.

Include both main spindles and live tooling spindles in the count

Verify PLC spindle configuration

Access Setup → PLC → Configuration and ensure SPINDLE_COUNT matches the total configured spindles from machine parameters.

Incorrect spindle count affects M03/M04/M05 command processing

Recompile PLC program

Update SPINDLE_COUNT, save configuration, and execute full PLC compilation from Setup → PLC → Compile PLC program.

Test spindle functions after recompilation to ensure proper operation

Backup current configuration

Create backup of current PLC program and configuration via Setup → Data management → Backup data before making changes.

Always backup before attempting configuration recovery

Restore default configuration

Navigate to Setup → PLC → Configuration and select 'Load default configuration' to restore factory PLC compiler settings.

Keep a copy of working PLC configuration files for quick recovery

Reconfigure constants

Manually re-enter correct values for OMG_COUNT, CHANNEL_COUNT, AXIS_COUNT, and SPINDLE_COUNT based on machine parameters, then recompile PLC.

Document all custom PLC configuration values for future reference

Check software version compatibility

Verify TNC software version in Setup → General → Version info and compare PLC configuration requirements in software documentation.

Keep PLC configuration documentation updated with software versions

Review post-update parameters

Check all machine parameters MP100-MP199, MP20010-MP20019, and MP3010-MP3019 to ensure they weren't reset during update.

Software updates may reset some machine parameters to defaults

Reconfigure PLC constants

Update PLC configuration constants to match current machine parameter values and perform complete PLC recompilation.

Always verify PLC functionality after software updates before returning machine to production