Welcome to the Fanuc System Variables Atlas.

System variables provide direct access to machine information, controller status, positions, offsets, tools, alarms, timers, and automation functions.

They are the foundation of advanced CNC automation.

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SECTION 1 — WHAT ARE SYSTEM VARIABLES
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System variables allow programs to read machine data.

Examples

Current position

Current tool

Active G-codes

Work offsets

Timers

Alarms

Machine status

Applications

Automation

Probing

Adaptive machining

Monitoring

Smart manufacturing

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SECTION 2 — POSITION VARIABLES
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5001

Machine X position

5002

Machine Y position

5003

Machine Z position

5021

Current work coordinate X

5022

Current work coordinate Y

5023

Current work coordinate Z

Applications

Position monitoring

Verification

Adaptive programming

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SECTION 3 — ACTIVE G-CODE VARIABLES
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4001

Motion mode

4003

Plane selection

4006

Units mode

Applications

Program validation

Mode detection

Safety checks

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SECTION 4 — TOOL VARIABLES
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4120

Current tool number

Applications

Tool verification

Tool life systems

Automatic setup

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SECTION 5 — ALARM VARIABLES
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3000

Custom alarm

3006

Operator message

Applications

Safety systems

Setup verification

Automation alerts

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SECTION 6 — TIMER VARIABLES
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Cycle tracking

Runtime monitoring

Maintenance intervals

Tool life management

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SECTION 7 — ADVANCED APPLICATIONS
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Automatic probing

Fixture verification

Tool monitoring

Adaptive offsets

Production tracking

Lights-out machining

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FINAL PRINCIPLE

System variables transform CNC machines into intelligent manufacturing systems.

Understanding them allows programmers to monitor, control, automate, and optimize machining processes far beyond traditional G-code programming.