Tag Access; Network Symbols (Tags) For Flexible Support Of Program Changes; Access From Host Devices Is Enabled Using Tags - Omron CJ2 CPU UNIT User Manual

1 Overview
Tag Access (CJ2H-CPU6@-EIP and CJ2M-CPU3@ Only)

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.
CJ2 CPU Unit
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.
1-6
Data links enabled by names
Examples: Inputs from a to b
EtherNet/IP
CJ2 CPU Unit
Access is possible using tags.
Examples: Writing to a
Reading from b
EtherNet/IP
CJ2 CPU Unit
EtherNet/IP
SYSMAC
RUN
CJ2H
ERR/AL M
CPU64-EIP
INH
PROGRAMMABLE
PRPHL
CONTROLLER
COMM
BKUP
OPEN
MCPWR
BUSY
Specified by tag a.
PERIP HERAL
PORT
Inputs from c to d
CJ2 CPU Unit
Touch Panel
Host application, such as SCADA
NS-series PT
CJ2 CPU Unit
MS
NS
COMM
100M
10M
Tags are allocated in
a high-capacity area.
Designing is performed
by using only tags,
with no need to pay
attention to addresses.
CJ2 CPU Unit Hardware User's Manual
Middleware
Supporting EtherNet/IP