Category Program & G/M Codes

G-Code

The most widely used programming language for CNC machines. G-code commands control machine movements, spindle operations, coolant, and other functions through standardized alphanumeric codes.

G-Code

Definition

The most widely used programming language for CNC machines. G-code commands control machine movements, spindle operations, coolant, and other functions through standardized alphanumeric codes. Read it together with modal state, active plane, offsets, and controller dialect.

Formula / Rule

G-codes set motion, modal behavior, planes, compensation, and datum logic.
The same block can contain coordinates, feed, spindle, and auxiliary commands that must be read as one state.

Typical Range

Use it in every toolpath block, but judge meaning by the active modal context instead of the letter alone.

Shop-floor Scenarios

Check startup blocks first when restarting a part or loading a transferred program.
Compare posted code with the controller manual before dry run on a new machine.

Common Errors / Troubleshooting

If motion is unexpected, confirm the active plane, positioning mode, and compensation state before editing geometry.
If output differs between machines, verify controller dialect and post-processor settings.

Source-grounded Evidence

Notebook covers PMC/LADDER III, FSSB, restart patterns, macro compiler flow, TCP/G68.2, and backup/boot workflows.
Notebook covers GSK controller families, PLC, MDI, compensation, simulation, RS232/USB communication, and backup workflows.
Notebook covers Mitsubishi controller operation, PLC interfaces, user macros, external I/O, alarms, and high-speed precision features.
来源详细列出 FANUC 各系列的预备功能指令表，覆盖定位、插补、补偿与模式控制。
来源将 G 代码定义为控制系统中的行程条件或准备功能指令。