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Overview of Tag Data Links Section 6-1
*1 Unit version 2.0: 20 words (40 bytes) maximum.
System Configuration Conditions for Setting Tags Using Symbols or I/O Memory
Addresses
Local tags for tag data links can be set using I/O memory addresses or net-
work symbols. Support for network symbols, however, depends on the model
of CPU Unit, as shown in the following table.
Communications with the remote node are possible regardless of whether the
remote node tags are set using I/O memory addresses or network symbols.
Note Symbols cannot be set for tags with CJ2H-CPU6@ and CJ2M-CPU1@ CPU
Units.
6-1-4 Data Link Data Areas
Tags A data link between the local I/O memory and a remote I/O memory is called
a tag. A tag can be set using a network symbol name or an I/O memory
address.
Tag Sets When a connection is established, from 1 to 8 tags (including PLC status) is
configured as a tag set. Each tag set represents the data that is linked for a
tag data link connection. Tag data links are thus created by connecting one
tag set to another tag set. A tag set name must be set for each tag set.
Note A connection is used to exchange data as a unit within which data concur-
rency is maintained. Thus, data concurrency is maintained for all the data
exchanged for the tags in one data set.
Example In the following example, input tags a to g at the originator are a tag set
named SP1_IN and output tags i and ii are a tag set named SP1_OUT). A
connection is set between these two tag sets.
Maximum link data
size per node (total
size of all tags)
184,832 words max. (722 words × 256) (CJ2M-EIP21: 640
words max.)
Connections Number of connections per Unit: 32 max. for CJ2M-EIP21,
256 max. for other CPU Units
Connection type Each connection can be set for 1-to-1 (unicast) or 1-to-N (mul-
ticast) communications. (Default: Multicast)
Packet interval (RPI) 1 to 10,000 ms for CJ2M-EIP21 and 0.5 to 10,000 ms for other
CPU Units (in 0.5-ms units)
The packet interval can be set separately for each connection.
Item Specification
Name in hardware list
of Network
Configurator
CPU Unit EtherNet/IP Unit or
built-in EtherNet/IP port
Symbol name
specification
I/O memory
address
specification
CJ2B-EIP21 CJ2H-CPU6@-EIP CJ2H-CPU@@-EIP OK OK
CJ2M-EIP21 CJ2M-CPU3@ CJ2M-CPU3@ OK OK
CJ1W-EIP21(CJ2) CJ2H-CPU6@-EIP
CJ2H-CPU6@
CJ2M-CPU3@
CJ2M-CPU1@
CJ1W-EIP21 OK
(CJ2H-CPU6@-EIP and
CJ2M-CPU3@ only)
(See note.)
OK
CJ1W-EIP21 CJ1 CPU Unit CJ1W-EIP21 --- OK
CS1W-EIP21 CS1 CPU Unit CS1W-EIP21 --- OK
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