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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. 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

4. Sequential function chart - Wikipedia

   en.wikipedia.org/wiki/Sequential_function_chart

   Sequential function chart (SFC) is a visual programming language used for programmable logic controllers (PLCs). It is one of the five languages defined by IEC 61131-3 standard. The SFC standard is defined as Preparation of function charts for control systems , and was based on GRAFCET [ fr ] (itself based on binary Petri nets [ 1 ] [ 2 ] ).

5. Programmable logic controller - Wikipedia

   en.wikipedia.org/wiki/Programmable_logic_controller

   PLC programs are typically written in a programming device, which can take the form of a desktop console, special software on a personal computer, or a handheld programming device. [32] Then, the program is downloaded to the PLC directly or over a network. It is stored either in non-volatile flash memory or battery-backed-up RAM.

6. Simatic - Wikipedia

   en.wikipedia.org/wiki/SIMATIC

   STEP 5 programs can be represented in three different ways: Statement List (STL) - The program consists of a sequence of mnemonic codes of the commands executed one after another by the PLC. Ladder Diagram (LAD) - Graphical representation of the automation task with symbols of the circuit diagram

7. Structured text - Wikipedia

   en.wikipedia.org/wiki/Structured_text

   Structured text, abbreviated as ST or STX, is one of the five languages supported by the IEC 61131-3 standard, designed for programmable logic controllers (PLCs). [1] [2] It is a high level language that is block structured and syntactically resembles Pascal, on which it is based. [3]