Bit-level comments

Bit-level comments are descriptions added to explain the purposes or functionality of individual bits.

In language editors, bit-level comments are shown when you assign variables to Program Organization Unit (POU) elements. Bit-level comments apply to the following variable types, POUs, and POU elements:

User-defined variables
Variables of the INT data type
Multi-dimensional arrays that are of the INT data type
POUs and POU elements
Instructions, coils, and contacts in an LD
Global and local variables in a UDFB
Global and local variables in a UDF

Bit-level comments capture the changes that are made to the associated variables when performing the following actions:

Add, update, or delete POUs or variables.
Copy or paste POUs, variables, or cross instances.
Export or import devices or POUs.
Export or import global or local variables