Filter
Top Products
106
What Are Data Links? Section 5-1
5-1 What Are Data Links?
Data links automatically exchange data in the preset areas between nodes
(PLCs and/or computers) on one network. Data links can be freely created for
CS/CJ-series PLCs, C200HX/HG/HE PLCs, CVM1, CV-series PLCs,
CQM1H-series PLCs, and IBM PC/AT or compatible computers.
Two data link areas, area 1 and area 2, can be set for each node. Data links
can be set in either of the following ways.
CS/CJ-series Controller Link Unit Functions by Unit Version
Note Use the CX-Net in CX-Programmer version 5.0 or higher to set a data link
area in which the number of send and receive words exceeds 12,000 words,
or to set data link tables that allocate the same area for Area 1 and Area 2.
• Data link areas can be manually set by inputting data link tables using
Support Software. Data link tables are created to define the data links.
These tables enable free allocation of data link areas.
• Data links can be set automatically from a Programming Device. With
automatically set data links, all link areas are the same size.
Both automatic setting and manual setting cannot be used together in the
same network. The following rules apply to these two methods of setting data
links.
• Data links are enabled concurrently for area 1 and area 2.
• Separate settings (data link start words and send area size) are made in
area 1 and area 2. The sequences of send and receive words are the
same in area 1 and area 2.
• Not all nodes must participate in the data links.
Manually Setting Data Links
Functions Earlier version
(Pre-Ver. 1.2)
Unit version 1.2
CS1W-CLK21-V1
CJ1W-CLK21-V1
CS1W-CLK21-V1
CJ1W-CLK21-V1
Maximum number of data link
words (data link area for send-
ing/receiving that is created
for a single node in a single
CPU Unit)
12,000 max. 20,000 max.
Data Link Area The same area cannot be
allocated for both Area 1
and Area 2.
The same area can be
allocated for both Area 1
and Area 2.
# 1
# 1
# 1
# 2
# 2
# 2
# 2
# 1
# 2
# 2
# 1
# 1
# 1
# 1
# 2
# 2
# 1
# 2
# 1 # 2
# 1 # 1
Area 1
Area 2
Area 1
Area 2
Send only
Example 1: The order of send and receive
nodes is free.
Example 2: Some nodes can send data
without receiving data.