Which PLC programming language is much like an electrical schematic with blocks connected by lines representing links?

Which PLC programming language is much like an electrical schematic with blocks connected by lines representing links?

• A. Ladder Diagram
• B. Function Block Diagram
• C. Structured Text
• D. Sequential Function Chart

Answer: (B)

This is about recognizing how a PLC language visually represents signals and operations. Function Block Diagram uses blocks that perform functions, with lines linking the blocks to carry data between them. Those lines act like wires in a schematic, showing exactly how signals flow from one function to another. Because of that visual style, it’s the language that most closely mirrors an electrical schematic, making it intuitive for tracing how inputs become outputs through a sequence of blocks. Ladder Diagram, in contrast, resembles rungs on a ladder and relays logic with contacts and coils. Structured Text is more like writing code in a high-level language, not a schematic of blocks and wires. Sequential Function Chart uses steps and transitions to describe process flow rather than a network of interconnected function blocks.

This is about recognizing how a PLC language visually represents signals and operations. Function Block Diagram uses blocks that perform functions, with lines linking the blocks to carry data between them. Those lines act like wires in a schematic, showing exactly how signals flow from one function to another. Because of that visual style, it’s the language that most closely mirrors an electrical schematic, making it intuitive for tracing how inputs become outputs through a sequence of blocks.

Ladder Diagram, in contrast, resembles rungs on a ladder and relays logic with contacts and coils. Structured Text is more like writing code in a high-level language, not a schematic of blocks and wires. Sequential Function Chart uses steps and transitions to describe process flow rather than a network of interconnected function blocks.