Omron CJ2 CPU UNIT SOFTWARE User Manual page 135

5-4-2 Features of Function Blocks
Entering Addresses for Function Blocks
Addresses in function blocks are generally entered by using variables rather than the actual physical
addresses. The programmer uses these variables to set the parameters (i.e., addresses or values). The
address used for each variable is automatically allocated by the CX-Programmer every time a function
block is placed in the program.
Nesting
A function block can be nested within another function block. Up to eight nesting levels are possible,
including calling the first function block.
Smart FB Library
The Smart FB Library is a set of function blocks that improve operation between OMRON PLC Units
and FA components. It is not necessary to create a ladder program to use basic Unit and FA component
functions.
Online Editing of FB Definitions
FB definitions can be changed during operation, so FB definitions can be edited quickly during debug-
ging. In addition, FBs can be used with confidence even in equipment that must operate 24 hours/day.
Protecting FB Definitions
It is possible to prevent unauthorized manipulation, editing, or misappropriation of the program by set-
ting passwords for the function block definitions allocated in the project file and protecting the definitions
based on their purpose.
FB Generation Function
Existing PLC programming can be reused by easily converting it to FBs.
CJ2 CPU Unit Software User's Manual
5 Understanding Programming
5
5-43