FAPT Ladder allows you to assign meaningful names to addresses (e.g., COOLANT_PUMP instead of Y3.2). Comments can be added for rungs, networks, and individual contacts, making the logic readable for maintenance technicians.
Many machinist forums confuse "Fapt Ladder" with two different things:
The true "Fanuc Fapt Ladder" is the editor used to modify the Ladder on legacy systems before the advent of Windows-based Fanuc Ladder III software. Fanuc Fapt Ladder
Today, Fanuc uses "Ladder III" (Windows-based external software) or the iLadder feature on newer i-series controls (31i, 0i-D/F). However, FAPT Ladder remains a beloved feature for maintaining legacy Fanuc machines because it requires no external computer and provides instant visual debugging.
You cannot edit online. You must:
It is vital to understand that Fanuc Fapt Ladder is extinct. Modern Fanuc controls (31i, 32i, 0i-D) use Fanuc Ladder III software on a PC. Here is the comparison:
| Feature | Fanuc Fapt Ladder | Fanuc Ladder III (Modern) | | :--- | :--- | :--- | | Interface | Green monochrome CRT, keyboard arrow keys | Windows 10/11 GUI, Mouse driven | | Editor | On-board CNC only | PC software (upload via PCMCIA or Ethernet) | | Search function | Slow, limited to 1 address at a time | Full text search, cross-reference tables | | Backup format | .TF or .FD binary | .LAD or .LPC (convertible to PDF) | | Current status | Obsolete (1995) | Active, supported | FAPT Ladder allows you to assign meaningful names
If you are upgrading a machine, you must convert the old Fapt Ladder .FD file to a modern PMC format. This requires a specialized conversion service or an ancient DOS computer running FAPT LADDER-III (DOS version).