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.

 ladder logic
 function block diagram
 sequential function chart


 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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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.
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