Lenze DDS v2.0 - Manual (Page 25)

Introduction to IEC 61131-3 programming
Appendix
23
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 type.
Instruction 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., a PLC.
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.
Elementary data type A standard data type 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 A POU of type Function
Function organization unit See Function block
Function block A POU of type 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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