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5
Overview
Section 1-1
Data Links
Data links allow the constant sharing of data in predetermined data areas
between nodes, between PLCs, or between a PLC and an IBM PC/AT or com-
patible computer on the network. Data links do not require the use of commu-
nications programs on the PLC (CPU Unit) or IBM PC/AT or compatible
computer. Data written in the send area of the local node will be automatically
sent to the receive area of other nodes.
The I/O area (CIO area), link area (LR area), data memory area (DM area),
and extended data memory area (EM area) can be freely set in the send or
receive area. (The area used for sending or receiving data using the data link
function is called “data link area.”)
The data link area can be set automatically or manually.
Automatic Setting
Used for simple data link processing. Data link can be performed by simply
setting parameters in the DM area of the PLC.
Send data size per node is the same for all nodes. All nodes participating in
the data link share the same data.
Manual Setting
Used for flexible data link processing depending on each system.
Using the Controller Link Support Software, individual data link tables can be
set for each node and the data link area can be freely allocated for each node.
Send data size per node can be freely set. It is also possible to set nodes for
only send or receive data. With the Controller Link Unit, the data link can be
set to receive only a part of the data link area of other nodes.
Message Service
This function controls data transmission with particular nodes, reading or writ-
ing of status data, changing of operation modes, etc., by executing communi-
cations instructions on a program. The communications instructions include
SEND/RECV instructions for data transmission and CMND instructions for
issuing various commands.
SEND/RECV
The SEND or RECV instruction sends or receives data in an area of a particu-
lar node.
The SEND instruction sends data from an area of the local node and writes to
an area in the designated node.
Controller Link Unit
Constant data exchange (sharing)
PLC
PLC
PLC
Controller Link Unit
Data transmission (under certain conditions)
as required
User program
Communications instruction
PLC
PLC
PLC
Summary of Contents for CS1W-CLK12-V1
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Page 5: ...vi ...
Page 9: ...x TABLE OF CONTENTS ...
Page 11: ...xii ...
Page 59: ...42 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 62: ...45 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 91: ...74 CVM1 and CV series Optical Ring Controller Link Units Section 4 2 ...
Page 108: ...91 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 125: ...108 Checking Data Link Status Section 5 4 ...
Page 181: ...164 Setting Routing Tables Section 7 4 ...
Page 199: ...182 Memory Areas Related to Duplex Operation Section 8 6 ...
Page 275: ...258 Handling Precautions Section 10 7 ...
Page 298: ...281 CS series Optical Bus Controller Link Units Appendix C Dimensions Unit mm 101 35 130 ...
Page 299: ...282 CS series Optical Bus Controller Link Units Appendix C ...