Omron CJ2 User Manual page 40

1 Overview
General-purpose Networks for Support Software Interface
Built-in USB and EtherNet/IP Ports
Commercially available USB cable can be used to connect directly from a USB port on a personal
computer. In addition, a PLC on the EtherNet/IP network can be accessed via USB.
Prevent Connecting to the Wrong PLC by Using PLC Names from Support
Software
A user-set PLC name can be recorded in a CJ2 CPU Unit. When using Support Software to connect
online to a PLC, verification of the PLC name prevents incorrect connections from the Support Soft-
ware.
Tag Access
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
1-4
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
Inputs from c to d
CJ2 CPU Unit
Touch Panel
Host application, such as SCADA
NS-series PT
CJ2 CPU Unit Hardware User's Manual
Middleware
Supporting EtherNet/IP