Omron CPU Unit CJ2 - Manual (Page 9)

9
The Ease of Changing Designs Makes It
Simple to Add or Upgrade Equipment.
There is little effect on address changes.
Previously, when data was exchanged by
address specifi cation and addresses were
changed, the program had to be changed at
other Controllers and various operations, such as
memory checks, had to be performed. Now, tag
names eliminate the dependence on a memory
map and the need for checking items affected
by changes. This allows equipment to be easily
added or upgraded.
CJ2 CPU
Programmable Terminal
NS Series
EtherNet/IP
Host application
No change required.
Even after the change, the
number of items produced
is acquired correctly from
H200.
With the CX-Programmer, the ad-
dress for the tag named “Number
produced” is changed from D100
to H200.
Change
D100
H200
tag name address
Change
No change required.
Number_produced
Number_produced
Number_produced
Number_produced
Assurance of Quality, Free from Mistakes.
Tags can be shared among the CJ2 CPU Units,
NS-series PTs and Middleware. Tag names can
be shared among controllers that exchange
data using the CX-One or Excel import/export
functions. Because redundant address entry and
address allocation are not needed, checking is
also not required. This makes it easy to construct
high-quality systems.
What is Tag Access?
A tag is a name given to an address. Tags are
managed in the CJ2 CPU Unit, where they are
defi ned as network symbols. The common user-
defi ned tag names are used from Programmable
Terminals and host applications to access memory
in a CJ2 CPU Unit without knowing the actual
memory address.
NEW
CX-Programmer symbol tables can
be copied and pasted!
Copy
&
Paste
CX-Designer symbol table
CX-Programmer symbol table
Tag name
Number_produced
Production_target
Physical address
D100
D200
Tags are managed in the CJ2 CPU Unit as network symbols.
Data
&200
&500
Address
D100
D200
Symbol Table I/O Memory
EtherNet/IP
CJ2 CPU CJ2 CPU CJ2 CPU
Accessed by tag name Accessed by tag name
Accessed by tag name
Number_produced
Programmable Terminal
NS Series
Host application
Number_produced
Programmable Terminal screen
Created using tag names.
Application
Developed using tag names.
PAC ladder program
Developed using tag names.
Number_produced
Data links using tag names
Data link design
Allocated using tag names.