IEC 61131


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IEC 61131

A family of programming languages for programmable logic controllers (PLCs). Of the three graphical and two textual languages, ladder logic (see example below) was the first language and widely used. IEC 61131 was previously known as IEC 1131. See PLC.
Graphical

 ladder logic
 function block diagram
 sequential function chart


 Textual

 structured text
 instruction list



The following example of ladder logic shows how logical AND and OR gates are diagrammed. In this case, x = a AND (b OR c).

   ---[ ]-----|--[ ]--|-----( )---
       a      |   b   |      x
              |       |
              |--[ ]--|
              |   c   |
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References in periodicals archive ?
A Case Study on Migration from IEC 61131 PLC to IEC 61499 Function Block Control, Proceedings of Industrial Informatics, 2009.
This approach, however, follows IEC 61449 while our approach follows IEC 61131, and it is therefore inapplicable to our FBD programs.
Previously, multiple complex robots and highly dynamic packaging machines could not be simultaneously controlled using an IEC 61131 based controller.
The company's flagship product ISaGRAF is fully compliant with both IEC 61499 and IEC 61131 industrial standards, as confirmed by TouV Rheinland, and can be used to build a variety of automation products including embedded ocontrollers, PAC, PLC, DCS, RTU, CNC and motion controllers.
Control software can be developed using IEC 61131 standard languages, or a proprietary Festo tool called FST4 which offers a very simple-to-learn ladder logic system, or a statement-based programming approach with high level commands such as IF, THEN and ELSE.
KW-Software is the specialist for the integration of IEC 61131, SAFETY (IEC 61508 up to SIL3), PROFINET, .
Built-in IEC 61131 PLC functionality means that in many instances, the need for an external controller is eliminated with savings in control panel real estate and money.