Unverified50% confidenceFactExact time
STL (statement list) is a textual programming language in the IEC 61131-3 standard; ladder diagram (LAD) is a graphical language, composed of structured data made up of graphical elements such as contacts and coils along with coordinates and connection relationships.
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50%
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Long-term
Relevance
10/15/2026
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Related Claims
UnverifiedSCL (Structured Control Language) is a high-level structured text language defined by the IEC 61131-3 standard, and in Siemens TIA Portal it stands alongside ladder diagram (LAD) and function block diagram (FBD).67% similarUnverified结构化文本（ST）语法类似Pascal66% similarUnverifiedLadder diagram and STL cannot always be converted between each other losslessly: after some complex logic is exported from LAD to STL, it may no longer be restorable to the original ladder diagram when read back.65% similarVerifiedThe IEC 61131-3 standard defines five PLC programming languages, of which ladder diagram is the most intuitive.62% similarUnverifiedOntologies use standard languages such as OWL or RDFS to define types, properties, and constraints, serving as the schema layer of the knowledge graph.62% similar
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