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Introduction to IEC 61131-3 programming

Programming languages

DDS-IEC61131 EN 2.0

5 Programming languages

IEC 61131-3 defines the following five programming languages:

• IL: Instruction List (

Instruction List, IL

)

• ST: Structured Text (

Structured Text

)

• SFC: Sequential Function Chart (

Sequential Function Chart, SFC

)

• FBD: Function Block Diagram (

Function Block Diagram, FBD

)

• LD: Ladder Diagram (

Ladder Diagram, LD

)

Each of these languages is used for special applications which are particularly suited to solve certain

problems.

5.1 Instruction List (IL)

(Instruction List, IL)

Instruction List can be compared with Assembler and consists of a sequence of instructions.

• Every instruction starts with a new line, contains an operator and, depending on the

operation, one or several operands separated by commas.

• An identifier marker followed by a colon (:) can be in front of an instruction.

• Comments can be entered additionally.

• It is possible to insert empty lines between the instructions.

Example:

LD 17

ST lint (* Comment*)

GE 5

JMPC next

LD idword

EQ istruct.sdword

STN test

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