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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.
Ladder diagram (LD), graphical; Function block diagram (FBD), graphical; Structured text (ST), textual; Instruction list (IL), textual (deprecated in 3rd edition of the standard. Per IEC 61131-3-2013, Section 7.2.1: Instruction List, General, "This language is outdated as an assembler like language.
Ladder diagram may refer to: Message sequence chart, in Unified Modeling Language (UML) Ladder logic, a method of drawing electrical logic schematics. A ladder ...
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.
Example Ladder Logic Diagram The schematic diagrams for relay logic circuits are often called line diagrams, because the inputs and outputs are essentially drawn in a series of lines. A relay logic circuit is an electrical network consisting of lines, or rungs, in which each line or rung must have continuity to enable the output device.
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