Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 75)

Using Symbols and Expressions
in Report Generation
Chapter 8
8Ć7
When the 1775-S4B scanner detects an error in executing a procedure or a
direct command, it assigns a numeric value to the interprocedural user
symbol:
ERROR
This user symbol must be reserved exclusively for this purpose.
A system symbol represents an entire procedure or a PLC-3 memory
address. You must precede the system symbol with the @ delimiter. The
system symbol can contain up to eight unique upper and lower case letters,
numbers, or the underscore character. The first character in the procedure
name must be a letter or an underscore character. For example:
@TIME
If you are using an industrial terminal to execute report generation
procedures, you cannot use lower case letters to name a system symbol as
the industrial terminal does not recognize lower case letters.
Report generation supports two types of system symbols:
Procedure name—The name that identifies a procedure. You use the
edit command to create and store the procedure and its name.
Example: ED @TEST
Symbolic address—A specific PLC-3 memory address. You use the
create command to assign and store a symbolic address.
Example: CR @HR $E0.0.0.17
You can classify system symbols in one of two ways:
Local
Global
If you create a local system symbol, the 1775-S4B scanner only recognizes
this symbol in the context in which you created it. For example:
If you enter:
ED @TEST
8.3.3
User Symbol for Detecting
Errors
8.4
System Symbols