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User Link Tables
3-5
User Link Tables
3-5-1 Overview
User link tables are used to exchange data between a Loop Controller and the
CPU Unit. User link tables cannot be used with Loop Control Units. A user-de-
fined tag name and conditions for data exchange with the CPU Unit are set for
each row of the table. For each tag name, the specified I/O memory locations in
the CPU Unit are read and written according to the specified conditions. Up to
2,400 tags can be created.
Tags are registered in the user link table using the CX-Process Tool. Once tags
have been registered in a user link table, they can be used in line connections,
sequence tables, and other programming in the Loop Controller without having
to specify specific I/O memory addresses.
Loop Controller
Data can be
read/written
with function
block items.
Function block data
If an external
device contact
input is used,
CPU Unit I/O
memory can be
read/written on
ITEM timing.
User link tables can also be pasted as virtual blocks on block diagrams. Also,
tags can be automatically registered in user link tables when a field terminal
block is pasted and software connections are made. (Select Settings/Option
and then select the Register Tag Name automatically when connected to
Field Terminal option on the User Link Table Tab Page.)
Loop Controller
Function block data
Virtual link
table block
Tag A
Tag C
Note User link table tags can be saved in CSV format. They can thus be used in SCA-
DA software to specify user link table tags to read and write I/O memory in the
CPU Unit. (If Add User Link Table Information is selected in the CSV Tag
Compile Dialog Box, the user link table tags will be appended after the normal
HMI CSV tags.
The following read/write timing
can be set for each tag:
1. Always
2. When I/O memory changes
3. When external device
contact input turns ON
Table
Tag A
Tag B
Tag C
Sequence
table
Corre-
Table
spond
Tag A
Tag B
Tag C
Section
3-5
CPU Unit
I/O memory
CPU Unit
I/O memory
159
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