What causes FANUC alarm 137?

A spindle orientation M code (such as M19) was programmed in the same block as an axis move command. The programmer combined a spindle positioning M code with a C-axis or spindle axis address in one block instead of separating them. Post-processor error caused the spindle positioning M code and axis movement to be output on the same line. Copy-paste or manual editing of the NC program accidentally merged two separate blocks into one.

How do I fix FANUC alarm 137?

1. Open the part program and go to the line number indicated by the alarm. Look for a block that contains both an M code related to spindle positioning (like M19) and an axis address on the same line. 2. Separate the spindle positioning M code into its own block. The M code must complete before any axis movement is commanded, so put the M code on one line and the axis move on the next line. 3. Check if a dwell or wait is needed between the spindle positioning M code and the axis move to allow the spindle to finish orienting before motion begins. 4. If the program was generated by a CAM post-processor, review the post settings to ensure spindle orientation commands are never output on the same block as axis moves. Regenerate the program after fixing. 5. After editing the program, run a dry run or single-block test to confirm the alarm is cleared and the spindle orients correctly before axis motion begins.

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FANUC Controller

Program/G-code · Basic · 10-20 minutes

Alarm 137

Fanuc Alarm 137 - M-CODE AND MOVE CMD IN SAME BLK

Fanuc Alarm 137 occurs when a part program block contains both an M-code that commands spindle positioning (such as M19 for spindle orientation) and a move command for the axis that is designated as the spindle positioning axis (typically C-axis). This simultaneous specification violates Fanuc programming syntax rules, as spindle positioning commands and C-axis movement commands must be issued in separate blocks.

FANUCProgram/G-codeBasic10-20 minutes

137

Fanuc Alarm 137 - M-CODE AND MOVE CMD IN SAME BLK

PMC System Alarm

Root Cause Summary

Fanuc Alarm 137 occurs when a part program block contains both an M-code that commands spindle positioning (such as M19 for spindle orientation) and a move command for the axis that is designated as the spindle positioning axis (typically C-axis). This simultaneous specification violates Fanuc programming syntax rules, as spindle positioning commands and C-axis movement commands must be issued in separate blocks.

Safety

Machine logic affected
⚠️ CRITICAL: Machine safety logic may be compromised
Electrical Hazard: Disconnect power to the machine before performing any electrical troubleshooting. Lockout/Tagout procedures must be followed.
Mechanical Hazard: Be aware that the machine's axes may move unexpectedly if the PMC program is corrupted. Ensure the work area is clear of obstructions and personnel.
Crush Hazard: Some PMC errors can cause unexpected activation of hydraulic or pneumatic cylinders. Keep hands and other body parts clear of potential pinch points.
Static Discharge Hazard: When handling electronic components, use proper ESD precautions to prevent damage.
Always wear appropriate personal protective equipment and ensure the area is safe before proceeding.

Causes and Fixes

1
Locate the alarm block number in the CNC display and review the NC program at that line number. Look for M19, M119, or other spindle positioning M-codes combined with C-axis address words.
2
Separate the commands into two blocks: Place M19 (or spindle orient M-code) in one block, then program the C-axis movement in the subsequent block. Example: Change 'N100 G00 X50. C90. M19;' to 'N100 M19; N101 G00 X50. C90.;'
3
Verify parameter 4000#0 (C-axis control enable bit) and parameter 4016 (spindle positioning M-code number, typically 19) are correctly set to confirm system configuration for spindle positioning.
4
Test the modified program in single block mode to confirm the spindle orients correctly with M19, then the C-axis executes the rotary movement independently.
Do not run program in automatic mode until single block testing confirms proper operation.

DIY Feasiblehigh confidence

Call a technician if:

·PMC ladder modifications required
·Servo parameter corruption suspected
·Mechanical spindle orientation issues

Prevention

Always separate M19 and C-axis commands into different program blocks
Verify parameter backup before making spindle configuration changes
Use proper dwell times between spindle orient and positioning moves

Common Mistakes

Programming M19 C90.0 in same block
Modifying parameter 3117 without understanding spindle control method
Not allowing sufficient time for spindle orientation completion

Related Alarms

136 138 PS0300 SV0300

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