1 Overview
1-6
CJ2 CPU Unit Software User’s Manual
z Network Symbols (Tags) for Flexible Support of Program Changes
The CJ2 CPU Units support network symbols (tags). They have an internal tag name server that
enables them to store tag names and addresses in advance in symbol tables in the CPU Units. Tags
enable the following features.
Data links can be set using tags.
With data links on an EtherNet/IP network, send and receive areas can be specified using symbols
rather than addresses. This enables flexible support for design changes by allowing the data link
areas set by tags to remain unchanged, while simply changing the symbol tables that contain the tag
names and addresses.
Access from host devices is enabled using tags.
Tags can be used for access from host devices, such as touch panel NS-series Programmable Ter-
minals. This makes the creation of host screens and programs at devices such as PTs much more
convenient.
Automatic tag allocation makes it unnecessary to know the addresses.
Automatic allocation of tags in the high-capacity EM Area, using automatic address allocation in CX-
Programmer symbol tables, enables data link design and access from host devices without having to
pay attention to addresses.
Tag Access (CJ2H-CPU6@-EIP and CJ2M-CPU3@ Only)
Data links enabled by names
EtherNet/IP
Examples:
Inputs from a to b
Inputs from c to d
CJ2 CPU Unit
CJ2 CPU Unit
EtherNet/IP
Touch Panel
NS-series PT
Examples:
Writing to a
Reading from b
Middleware
Supporting EtherNet/IP
CJ2 CPU Unit
CJ2 CPU Unit
Host application, such as SCADA
Access is possible using tags.
PERIPHER
A
L
ERR/ALM
RUN
INH
COM
M
BKU
P
PRPHL
CONTR
OLLER
CPU6
4-
EIP
CJ2H
SYSMAC
PROGRAM
MABLE
PORT
OPEN
BUSY
MCPWR
NS
M
S
COM
M
10M
100
M
Tags are allocated in
a high-capacity area.
Designing is performed
by using only tags,
with no need to pay
attention to addresses.
EtherNet/IP
Specified by tag a.
CJ2 CPU Unit
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