Fanuc FAPT Ladder (specifically the modern FAPT LADDER-III ) is the standard PC-based programming system for developing, debugging, and maintaining sequence programs for Fanuc .

On newer Fanuc 30i/31i/32i and 0i-D/E models, the old "FAPT" branding faded, but the logic remains. Today, it is called the or Built-in Ladder Editor . It is faster, supports color touch screens, and allows online editing without stopping the machine.

The "Ladder" aspect refers to , the graphical programming language used to program Programmable Logic Controllers (PLCs). Inside a Fanuc CNC, the PMC (Programmable Machine Controller) uses Ladder Logic to handle M-codes, T-codes, safety interlocks, and coolant control.

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Programming efficiently within the FAPT Ladder environment requires a solid grasp of Fanuc's standard addressing convention. Data is categorized into distinct memory areas:

A new project is created by selecting the exact PMC model matching the target Fanuc hardware. Alternatively, an existing .LAD or #Mnemonic file is imported.

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