Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 61)

Addressing Rules and Examples

Chapter 4

45

Figure 4.4

Symbol

ypes

User Symbol

Generate

this symbolic

value

through the

assignment command

Symbol

System Symbol

Generate this symbol

with the Edit command

(for a procedure name)

or a Create command

(for a symbolic address).

Procedural

Applies only to the

procedure in which it is

generated.

Interprocedural

Applies to the procedure

in which it is generated

plus any other procedure

nested together with that

procedure

Procedure Name

Applies to a single

procedure or other

procedures nested

together

within that

procedure.

Global

Applies to any context.

Symbolic Address

Can

be used

anywhere

in place of a logical

address.

Local

Applies only to the

context in which the

symbol

is generated.

10021–I

System Symbols

A system symbol is used as either a procedure name or a symbolic

address. The characters in a system symbol must conform to the general

rules given above for all symbols. System symbols are delimited by the

character @, which distinguishes them from user symbols.

Procedure Names

A procedure name is a way of referring to a message procedure. You

assign a procedure name at the time you generate, or edit, the message

procedure (Chapter 6).

One procedure can execute a second procedure simply by stating the

name of that second procedure. This allows for nesting of procedures up

to three levels deep.

Symbolic Addresses

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