Exchanging Data - Omron SYSMAC CS1W-LCB01 Operation Manual

Exchanging Data with the CPU Unit
3-3-3

Exchanging Data

Using the user link table to exchange data with the CPU Unit
Explanation of the user
link table
Note
The Loop Controller can exchange any kind of data with the CPU Unit by
either of the following two methods.
• Exchanging data regularly or for a specified condition (when a function
block ITEM goes ON):
Use the User Link Table (i.e., register a tag in the User Link Table and use
that tag in the function block).
• Exchanging data with the CPU Unit only when required:
Use a CMND(490) instruction in the user program to send a FINS com-
mand to the Loop Controller.
Note Data for the HMI (Control, Function, External Control, or System
Common Block) can be read and written by reading and writing
data in the EM area from the CPU Unit's ladder program specifying
the EM area words allocated as the HMI data area.
The User Link Table is a table in the Loop Controller that is used to exchange
data with the CPU Unit.
Loop Controller
Function Block data
Virtual link
table block Equivalent
Tag A
Tag C
Set the necessary data in each line, including the user-defined tag name and
other parameters such as the CPU Unit's I/O memory address, 0%/100%
scaling values, refresh period, and function block ITEMs to be read/written.
Each tag can read or write data in the specified CPU Unit I/O memory for the
specified conditions. It is also possible to exchange data regularly or refresh a
particular function block's ITEM data when there is a change in the CPU Unit's
I/O memory. Up to 2,400 tags can be created.
Use the CX-Process Tool to register tags in the User Link Table.
Once the tags have been registered in the User Link Table, the tag names can
be used in Loop Controller programming such as connections or sequence
tables, so it isn't necessary to know the specific CPU Unit I/O memory
addresses associated with each tag when programming.
The User Link Table can also be pasted in a block diagram as a virtual func-
tion block.
It is also possible to store the User Link Table's tags in CSV format.
If the tags are stored in CSV format, the CPU Unit's I/O memory can be read
and written from SCADA software just by specifying the User Link Table tags.
The User Link Table tags will be stored just after the CSV tags for the HMI if
the "Add User Link Table Information" selection is checkmarked in the Com-
pile CSV Tags dialog box with the CX-Process Tool.
CPU Unit
User Link Table
Tag
A
Tag
B
Tag
C
Section 3-3
I/O memory
145