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2. Ladder logic - Wikipedia

   en.wikipedia.org/wiki/Ladder_logic

   Ladder diagrams were once the only way to record programmable controller programs, but today, other forms are standardized in IEC 61131-3. For example, instead of the graphical ladder logic form, there is a language called Structured text , which is similar to C, within the IEC 61131-3 standard.

3. CODESYS - Wikipedia

   en.wikipedia.org/wiki/CODESYS

   The company was founded in 1994 under the name 3S-Smart Software Solutions. It was renamed in 2018 and 2020 to Codesys Group / Codesys GmbH. Version 1.0 of CODESYS was released in 1994. Licenses of the CODESYS Development System are free of charge and can be installed legally without copy protection on further workstations.

4. Sequential function chart - Wikipedia

   en.wikipedia.org/wiki/Sequential_function_chart

   It is also possible to insert LD (Ladder Diagram) actions inside an SFC program (and this is the standard way, for instance, to work on integer variables). SFC is an inherently parallel programming language in that multiple control flows — Program Organization Units (POUs) in the standard's parlance — can be active at once.

5. IEC 61131-3 - Wikipedia

   en.wikipedia.org/wiki/IEC_61131-3

   Part 3 of IEC 61131 deals with basic software architecture and programming languages of the control program within PLC. It defines three graphical and two textual programming language standards: Ladder diagram (LD), graphical; Function block diagram (FBD), graphical; Structured text (ST), textual

6. Programmable logic controller - Wikipedia

   en.wikipedia.org/wiki/Programmable_logic_controller

   Similarly, a parallel set of instructions will perform a logical OR. In an electromechanical relay wiring diagram, a group of contacts controlling one coil is called a "rung" of a "ladder diagram", and this concept is also used to describe PLC logic. Some models of PLC limit the number of series and parallel instructions in one "rung" of logic.

7. Simatic - Wikipedia

   en.wikipedia.org/wiki/SIMATIC

   The S5 product line was usually programmed with a PC based software programming tool called STEP 5. STEP 5 was used for programming, testing, and commissioning, and for documentation of programs for S5 PLCs. The original STEP 5 versions ran on the CP/M operating system. Later versions ran on MS-DOS, and then versions of Windows through Windows ...