What causes FANUC alarm 094?

Part program contains an illegal or malformed command related to the alarm condition. Missing required address word or parameter value in the program block. Programmed value is out of the allowable range. Conflict between active modal codes and the commanded function. Post-processor configuration mismatch for this Fanuc series.

How do I fix FANUC alarm 094?

1. Note the block number shown in the alarm screen and locate that block in the program. 2. Review the command in that block against the Fanuc programming manual. 3. Check for missing words, incorrect values, or conflicting G-code combinations. 4. Verify the program is post-processed for the correct Fanuc series. 5. Correct the program and dry-run at low speed before resuming machining.

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FANUC Controller

Program/G-code · Basic · 5-15 minutes

Alarm 094

Fanuc Alarm 094 - Work Coordinate Required

Fanuc Alarm 094 occurs when the CNC attempts to execute a machining operation without an active work coordinate system (G54-G59, G54.1, etc.). This alarm is triggered when the control detects that no work offset has been established or called prior to positioning or cutting commands, typically after power-on, program restart, or when G-code omits the necessary work coordinate selection.

FANUCProgram/G-codeBasic5-15 minutes

094

Fanuc Alarm 094 - Work Coordinate Required

Coordinate System Not Set

Root Cause Summary

Fanuc Alarm 094 occurs when the CNC attempts to execute a machining operation without an active work coordinate system (G54-G59, G54.1, etc.). This alarm is triggered when the control detects that no work offset has been established or called prior to positioning or cutting commands, typically after power-on, program restart, or when G-code omits the necessary work coordinate selection.

Safety

Position reference unknown

Causes and Fixes

1
Review the active NC program at the line preceding the alarm. Verify that a work coordinate command (G54, G55, G56, G57, G58, or G59) is programmed before any G00, G01, G02, or G03 movement commands.
2
Check parameter 1202 bit 5 (G54) which determines if G54 is automatically selected at power-on. If set to 0, work coordinate must be explicitly programmed. Navigate to SYSTEM > PARAM > search for parameter 1202.
3
Insert appropriate work coordinate command (typically G54) at program start or in the initialization block after tool change. Ensure it appears before the first positioning command.
4
Reset the alarm using RESET button, return to program start, and execute the corrected program from the beginning to verify work coordinate activation.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter 3104 needs modification
·Repeated coordinate system corruption
·Work offset values appear corrupted or unstable

Prevention

Avoid modifying work offsets during program execution
Use program stop (M00/M01) before making coordinate changes
Always use sequence number restart after coordinate modifications
Document coordinate system states before making changes

Common Mistakes

Attempting P-type restart after any coordinate change
Not verifying active coordinate system before restart
Forgetting to cancel G92 before coordinate system changes
Modifying wrong coordinate system (G54 vs G55, etc.)

Related Alarms

010 011 093 095

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