Converting Function Block Definitions To Library Files - Omron CX-PROGRAMMER 5.0-FUNCTION BLOCK OPERATION Operation Manual

Converting Function Block Definitions to Library Files

Function Block Holding
Area Words (H512 to
H1535)
1-4 Converting Function Block Definitions to Library Files
16
Setting Procedure
Select Function Block Memory - Function Block Memory Allocation from
the PLC Menu. Set the areas in the Function Block Memory Allocation Dialog
Box.
Function Block Instance Areas
FB Instance
Area
Start Address
Non Retain H512
Retain H1408
Timers T3072
Counters C3072
The Function Block Holding Area words are allocated from H512 to H1535.
These words are different to the standard Holding Area used for programs
(H000 to H511) and are used only for the function block instance area (inter-
nally allocated variable area). These words cannot be specified as instruction
operands. They are displayed in red if input when a function block is not being
created. Although the words can be input when creating a function block, an
error will occur when the program is checked. If this area is specified not to be
retained in the Function Block Memory Allocation Dialog Box, turn the power
ON/OFF or clear the area without retaining the values when starting opera-
tion.
A function block definition created using the CX-Programmer can be stored as
a single file known as a function block definition file with filename extension
*.cxf. These files can be reused in other projects (PLCs).
Project
Function block definition
Example: CLOCK_PULSE
1. Algorithm
tim_b
TIMX tim_a OFF_TIME
tim_a
TIMX tim_b ON_TIME
ENO
2. Variable Definitions
Usage Name
Type
Internal tim_a TIMER
tim_b TIMER
Internal
Input ON_TIME INT
Input OFF_TIME INT
Default value
End Address Size
H1407 896
H1535 128
T4095 1024
C4095 1024
Project
Save
Read
Function block
definition file (.cxf)
Section 1-4
Applicable memory
areas
CIO, WR, HR, DM, EM
HR, DM, EM
TIM
CNT
Function block definition
Example: CLOCK_PULSE
1. Algorithm
tim_b
TIMX tim_a OFF_TIME
tim_a
TIMX tim_b ON_TIME
ENO
2. Variable Definitions
Usage
Name Type
Internal
tim_a TIMER
tim_b TIMER
Internal
Input ON_TIME INT
OFF_TIME INT
Input