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5 Understanding Programming

CJ2 CPU Unit Software User’s Manual

5-5 Symbols

5-5-6 Variables in Function Blocks

Programs in function blocks are all written with variables rather than actual addresses. Variables in

function blocks have different variable types and specifications than symbols outside of function blocks.

For details on variables in function blocks, refer to the CX-Programmer Operation Manual: Function

Blocks and Structured Text (Cat. No. W447).

z Function Block Variable Fields

5-5-6 Variables in Function Blocks

CLOCK PULSE

(BOOL)

ON_TIME

(INT)

OFF_TIME

ENO

(BOOL)

tim_b

tim_a

TIMX tim_a OFF_TIME

TIMX tim_b ON_TIME

ENO

Ladder Diagram

Inside Function Blocks

Algorithm

Variables (e.g., input variables, output

variables, and I/O variables) for transferring

data between external programming and

programming in function blocks

Variables used only in function

blocks (internal variables and

external variables)

Omron CJ2 CPU UNIT SOFTWARE User Manual

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