Omron CX-PROCESS TOOL V5.2 - 12-2009 Operation Manual page 201

Creating User-defined Blocks
External
inputs to
user-defined
block
Function Blocks Not
Supported in
User-defined Blocks
Restrictions in the
Number of User-defined
Blocks
Displaying User-defined
Function Blocks
174
3. A virtual block that functions as the output interface block to handle output
data for the above group of blocks
2. Input interface block
1. Algorithm registered as one group
Input
interface
Note The only external I/O for a user-defined block are the analog I/O con-
nected to the input and output interfaces. Reading and writing ITEMs
in the function blocks within the user-defined block is performed in the
same way as for any other function block.
The following function blocks cannot be used in user-defined blocks:
• Field Terminals
• User link tables
• Sequence tables
• Step ladders
Create these function blocks outside of the user-defined blocks.
The CX-Process Tool version 4.0 or higher is required to register step ladder
blocks in user-defined blocks.
All other function blocks can be used in user-defined blocks.
Up to 96 user-defined function blocks can be created in each function block file.
User-defined function blocks are displayed as one function block with the input
and output names assigned in the input and output interfaces.
3. Output interface block
Output
interface
User-defined Block A
Actual display of
User-defined Block A
(This user-defined block consists of
inputs a and b, and output c.)
Section 3-6
External
outputs from
user-defined
block