What causes FANUC alarm 114?

Peripheral system (hydraulic, coolant, auxiliary) component fault or sensor indicating an out-of-limit condition. PMC input signal from the affected peripheral device not in the expected state. Fluid level, pressure, or temperature outside acceptable limits. Mechanical fault in the peripheral system mechanism. Wiring or sensor fault on the peripheral system I/O.

How do I fix FANUC alarm 114?

1. Identify the specific peripheral system indicated by the alarm name. 2. Check the fluid level, pressure, and temperature for the relevant system. 3. Inspect the relevant mechanism for mechanical faults or obstructions. 4. Check the PMC input signals for the peripheral system in the Fanuc PMC monitor. 5. Consult the machine tool builder documentation for alarm 114 specific remedy.

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FANUC Controller

Program/G-code · Intermediate · 30-60 minutes

Alarm 114

Fanuc Alarm 114 - ILLEGAL EXPRESSION FORMAT

Fanuc Alarm 114 ILLEGAL EXPRESSION FORMAT occurs when a custom macro program (G65, G66, or macro variables) contains syntax errors in mathematical expressions or variable assignments. This is typically caused by incorrect use of operators, brackets, functions, or variable formats within macro statements that do not conform to Fanuc macro B programming rules.

FANUCProgram/G-codeIntermediate30-60 minutes

114

Fanuc Alarm 114 - ILLEGAL EXPRESSION FORMAT

Chuck Open

Root Cause Summary

Fanuc Alarm 114 ILLEGAL EXPRESSION FORMAT occurs when a custom macro program (G65, G66, or macro variables) contains syntax errors in mathematical expressions or variable assignments. This is typically caused by incorrect use of operators, brackets, functions, or variable formats within macro statements that do not conform to Fanuc macro B programming rules.

Safety

LOCKOUT/TAGOUT required - isolate hydraulic and pneumatic pressure before servicing chuck components
Chuck jaws under spring tension - use proper restraint procedures during disassembly
High pressure hydraulic lines present - depressurize system before disconnecting fittings
Depressurize hydraulic system before disconnecting high-pressure fittings
Electrical shock hazard - disconnect power before working on electrical components.
Pinch point hazard - keep hands clear of moving chuck jaws.
Projectile hazard - ensure workpiece is securely clamped before starting machining operations.
Ensure proper grounding of the machine and chuck system to prevent electrical hazards.
Use appropriate personal protective equipment (PPE) including safety glasses, gloves, and hearing protection.
Be aware of potential for stored energy in hydraulic or pneumatic systems even after shutdown.
Apply LOCKOUT/TAGOUT - isolate hydraulic and pneumatic pressure before servicing
Maintain proper machine and chuck system grounding
Wear appropriate PPE including safety glasses, gloves, and hearing protection
Check for stored energy in hydraulic/pneumatic systems even after shutdown
Ensure the machine is properly grounded before performing any maintenance or troubleshooting.
Always use a chuck key or wrench extension when manually operating the chuck.
Never attempt to adjust or repair the chuck while the machine is running.
Be aware of the potential for workpiece ejection if the chuck is not properly clamping.
Use caution when handling hydraulic/pneumatic fluids, as they can be harmful if ingested or inhaled.
Properly secure the workpiece before starting any machining operations.
Always wear safety glasses when working near the chuck.
Ensure the chuck is properly balanced to prevent vibration and premature wear.
Consult the machine's operation manual and chuck manufacturer's instructions for specific safety guidelines.

Causes and Fixes

1
Locate the program line number displayed with the alarm on the CRT screen. Navigate to EDIT mode and find the specific macro statement causing the error.
2
Check all bracket pairs in expressions like #100=[#101+#102] or #1=SIN[#2]. Ensure each opening bracket [ has a matching closing bracket ] and parentheses are not mixed with brackets in expressions.
3
Verify function syntax follows Fanuc format: SIN[ ], COS[ ], ATAN[ ]/[ ], SQRT[ ], ABS[ ], ROUND[ ], FIX[ ], FUP[ ]. Functions require square brackets, not parentheses.
4
Correct the expression syntax, reset the alarm using RESET button, and test the program in single block mode (SINGLE BLOCK switch ON) to verify proper execution.

DIY Feasiblehigh confidence

Call a technician if:

·PMC ladder modification required
·Hydraulic system major repair needed
·I/O module replacement with configuration changes

Prevention

Regular chuck cleaning and lubrication
Periodic hydraulic pressure checks
Preventive replacement of chuck sensors
Keep spare I/O modules in inventory

Common Mistakes

Ignoring hydraulic pressure warnings
Not checking sensor gap specifications
Modifying PMC without backup
Operating with intermittent chuck issues

Related Alarms

113 115 401 402

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Always verify with your machine manual or a certified technician before performing service procedures.