Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 76)

Using Symbols and Expressions
in Report Generation
Chapter 8
8Ć8
The 1775-S4B scanner only recognizes @TEST in the current context.
If you create a global symbol by using the global modifier (/G), the
1775-S4B scanner recognizes the symbol in any context. For example:
If you enter:
CR/G@HR$E0.0.0.17
The global modifier (/G) makes the system symbol @HR a global system
symbol. The 1775-S4B scanner recognizes this symbolic address in any
context.
Refer to the PLC-3 Programmable Controller Programming Manual
(publication 1775-6.4.1, formerly 1775-801) for a complete discussion on
context in the PLC-3 system. Refer to chapters 7 and 10 of this manual for
detailed information on the edit and create commands.
The PLC-3 processor stores system symbols in the system symbol table.
You can look at this table by typing:
DI [ENTER]
The PLC-3 processor returns a list of the system symbols recognized in the
current context. An example directory is given below:
Directory Ć System Symbols
NAME ADDRESS SIZE
MP_1 $E5.1.1.0.0 127
SA_1 $E0.0.0.7
MP_3 $E5.1.1.1.0 12457
MP_2 $E5.1.1.2.0 765
COUNT $N1:23
In the example above, @MP_1, @SA_1, and @MP_3 are global system
symbols. The other symbols @MP_2 and @COUNT are local system
symbols. The size column shows the number of words used to store each
message. Thus, @MP_1, @MP_3, and @MP_2 are procedures, and
@SA_1 and @COUNT are symbolic addresses.
The 1775-S4B scanner stores the system symbols in the symbol table in the
order that you create them.
8.4.1
Symbol Table