What Are Data Links - Omron CS1W-CLK12-V1 Operation Manual

What Are Data Links?

5-1 What Are Data Links?
Manually Setting Data Links
76
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-series, CVM1, and CV-series PLCs, and IBM PC/AT or compatible com-
puters (in token-bus mode only).
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.
• Data link areas can be manually set by inputting data link tables through
Controller Link Support Software (Ver. 2.00 or later). 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.
Example 1: The order of send and receive
nodes is free.
# 1
Area 1
# 1
# 2
# 1
Area 2
# 1
# 2
Example 3: Some nodes can receive
data without sending data.
# 1
Area 1
# 2
Receive only
# 1
Area 2
# 2
Receive only
Manually set data links are used to create flexible data links that meet the
needs of the individual system.
• Data links are set in the Controller Link Unit or Board of each node using
the Controller Link Support Software (Ver. 2.00).
• Area 1 and Area 2 can be selected from PLC memory areas, including the
DM Area and EM Area.
• A send area and its size can be allocated freely for each node.
• The sequence of receive nodes can be changed.
• Nodes can be set that only send or only receive data.
• Only part of send data can be received and an offset can be used to spec-
ify the beginning of the desired part.
Example 2: Some nodes can send data
without receiving data.
# 2 # 1
Area 1
# 1
# 2
Send only
# 1
# 2 # 1
Area 2
# 2
# 1
# 1
Example 4: A node can receive only a
specified number of words from
the beginning of an area.
# 2
Area 1
# 2
# 1
# 2
Area 2
# 2
Section 5-1
# 2
# 1
# 2
# 2
# 1
# 2
# 1 # 2
# 1
Several
# 2
words from
the begin-
# 1 # 2
ning of
area
# 1 # 1
# 2