Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 304)

Glossary-10

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

The user program contains all the statements and declarations and all the data

for signal processing which can be used to control a device or a process. It is

part of a programmable module (CPU, FM) and can be structured with

smaller units (blocks).

A container for blocks loaded into a programmable S7 module (e.g. CPU,

FM) where they are capable of running to control a unit or process.

The user program structure describes the call hierarchy of the blocks within a

CPU program and provides an overview of the blocks used and their

dependency.

The variable declaration includes a symbolic name, a data type and,

optionally, an initial value, an address, and a comment.

The variable declaration table is used for declaring the local data of a logic

block, when programming takes place in the Incremental Editor.

The variable table is used for compiling all the variables that are to be

observed and controlled along with their corresponding formats.

User Program

(SW Object)

User Program

Structure

Variable

Declaration

Variable

Declaration Table

Variable Table

Glossary

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