Instruction list (IL) is one of the 5 languages supported by the initial versions of
IEC 61131-3
IEC 61131-3 is the third part (of 10) of the open international standard IEC 61131 for programmable logic controllers. It was first published in December 1993 by the IEC; the current (third) edition was published in February 2013.
Part 3 of ''IEC ...
standard, and subsequently deprecated in the third edition.
It is designed for
programmable logic controllers (PLCs). It is a
low level language and resembles
assembly. All of the languages share
IEC61131 Common Elements
IEC 61131-3 is the third part (of 10) of the open international standard IEC 61131 for programmable logic controllers. It was first published in December 1993 by the IEC; the current (third) edition was published in February 2013.
Part 3 of ''IEC ...
. The variables and function call are defined by the common elements so different languages can be used in the same program.
Program control (
control flow
In computer science, control flow (or flow of control) is the order in which individual statements, instructions or function calls of an imperative program are executed or evaluated. The emphasis on explicit control flow distinguishes an ''im ...
) is achieved by ''
jump
Jumping is a form of locomotion or movement in which an organism or non-living (e.g., robotic) mechanical system propels itself through the air along a ballistic trajectory.
Jump or Jumping also may refer to:
Places
* Jump, Kentucky or Jump S ...
'' instructions and function calls (
subroutines
In computer programming, a function or subroutine is a sequence of program instructions that performs a specific task, packaged as a unit. This unit can then be used in programs wherever that particular task should be performed.
Functions may ...
with optional parameters).
The file format has now been standardized to
XML
Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable ...
by
PLCopen.
Example
Variations from IEC 61131
Many vendors whilst incorporating the full
IEC 61131-3
IEC 61131-3 is the third part (of 10) of the open international standard IEC 61131 for programmable logic controllers. It was first published in December 1993 by the IEC; the current (third) edition was published in February 2013.
Part 3 of ''IEC ...
requirements have additional vendor specific calls/function blocks to suit their hardware such as reading or writing to I/O.
Siemens PLC instruction list language is known as "Statement List" or "STL" in English, and "Anweisungs-Liste" or "AWL" in German, Italian and Spanish. The user of a Simatic development package may choose between German and International
mnemonics
A mnemonic ( ) device, or memory device, is any learning technique that aids information retention or retrieval (remembering) in the human memory for better understanding.
Mnemonics make use of elaborative encoding, retrieval cues, and imager ...
to represent instructions. For example, "A" for "AND" or "U" for "UND", "I" for "Input" or "E" for "Eingang".
See also
*
1-bit architecture
In computer architecture, 1-bit integers or other data units are those that are (1/8 octet) wide. Also, 1-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that are based on registers of that size.
T ...
References
External links
*
IEC 61131-3
Programmable logic controllers
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