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Introduction to IEC 61131-3 programming

Appendix

L DDS-IEC61131 EN 2.0

6.3 Glossary

Sequential Function Chart Sequential Function Chart SFC (Sequential Function Chart - SFC) is a programming language to describe

sequential and parallel control processes with time and event control.

Action Boolean variable or instructions which can be controlled through an action block (in SFC).

Action block Activation description of actions in SFC.

Current event Intermediate result in IL of any data t ype.

Ins truction List Instruction List (Instruction List - IL) is a common programming language for PLC systems similar to

Assembler .

SFC Abbreviation for Sequential Function Chart

IL Abbreviation for Instruction List

Organization unit (Sub-)program unit which is part of a PLC program. Often organization units can be loaded into the PLC

independently of each other. Compare POU.

CPU Central processing unit (Central Processing Unit)of,e.g.,aPLC.

Declaration Indication of variables and FB instances in a declaration block by also indicating the identifier, data type

and FB type as well as initial values, ranges and field features.

Declaration block Summary of declarations for a variable type at the beginning of a POU.

Elementar y data type A standard data t ype predefined by IEC 61131-3.

Function extensions A function can have a variable number of inputs.

FB Abbreviation for Function Block (Function Block), often, function blocks are also called ”Function

organization units”.

FB instance See Instance

FB type Name of a function block with request interface.

FBD Function Block Diagram, see Function Block Diagram

Function APOUoftype

Function

Function organization unit See Function block

Function block APOUoftype

Function_Block

Function Block Diagram The Function Block Diagram (Function Block Diagram) consists of a list of networks which enable the

user to create graphics that show any program process by means of connection elements.

FBD See Function Block Diagram

IL Instruction List, see Instruction List

Indirect FB call Call of an FB instance whose name has been transferred to a POU as

VAR_IN_OUT parameter.

Instance Structured data set of an FB by declaration of a function block plus indication of the FB type.

LD Abbreviation for Ladder Diagram

Configuration The configuration (Configuration) defines the PLC structure and represents the highest level in the

IEC 61131-3 software model.

Ladder Diagram Ladder Diagram (Ladder Diagram - LD) is a programming language to describe networks with

simultaneously operating Boolean and electromechanical elements such as contacts and coils.

LD Ladder Diagram, see Ladder Diagram

POU Abbreviation for Program Organization Unit (Program Organization Unit - POU)

POU Program Organization Unit, see Program Organization Unit

Program Organization Unit The Program Organization Unit is an organization unit in IEC 61131-3 of type function, function block or

program. It builds up user programs hierarchically.

Resource A resource (Resource) is a central unit (CPU) of a configuration.

Step Status node in an SFC program. Actions referring to a step are started here.

SFC Sequential Function Chart, see Sequential Function Chart

PLC Programmable Logic Controller (Programmable Controller).

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