PART 2: CX-Server PLC Tools
OMRON CHAPTER 10 – Data Links
CX-Server PLC Tools_Page 91
CHAPTER 10
Data Links
What Are Data Links?
Overview
Data links automatically exchange data in preset areas between nodes (PLCs and/or computers) on a network.
Settings can be made either manually or automatically.
CX-Net operations can be used for all operations from setting up the PLC network to controlling data exchange.
Manual Settings
Manual settings enable more flexible allocations, including the send size for each node, the sequence of nodes for
sending and receiving, and the setting of nodes for sending only or receiving only. Use manual settings to create
flexible data links to meet the requirements of the individual system (e.g., efficient utilization of memory,
restrictions on allocated addresses, etc.).
Data link tables (i.e., tables that define data link area allocations) are generated by CX-Net or network support
software (such as Controller Link Support Software), and sent to all nodes for use.
Controller Link
PC PC PC
Note: The following table provides a general comparison of manual setup between Controller
Link and SYSMAC LINK.
Item Controller Link SYSMAC LINK
Node sequence Free
Send size Can be specified.
Receive-only nodes Supported Supported
(Reception only is enabled by
setting the send area size at the
local node to 0.)
Send-only nodes Supported
Memory area Can be specified. Cannot be specified. Fixed as
follows:
CS/CJ/CV Series: Area 1: CIO;
Area 2: DM
C Series: Area 1: LR; Area 2: DM
Receive size Can be specified. All or none
Reception offset (reception
from start address + specified
number of words)
Can be specified. No (From start address only)
Communications cycle time Cannot be set. Can be set.
PLC PLC PLC
Controller Link
Unit
Only part of area
Only part of area
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