You're reading the documentation for an older, but still supported version (1.33.0).
For information on the latest version, please have a look at 1.33.5.

2.1 Constant Type

This section describes constant values used across the DRFL. These constants define fixed sizes, limits, I/O capacities, and utility macros that are referenced by multiple functions and data structures.

• 2.1.1 Boolean & Debug Constants
• 2.1.2 Robot Configuration Constants
• 2.1.3 String Size Constants
• 2.1.4 I/O Configuration Constants
• 2.1.5 I/O Configuration Constants (Version 3)
• 2.1.6 Motion / Configuration Size Limits
• 2.1.7 Modbus Configuration Constants
• 2.1.8 Flange & Hardware Utility Macros