Which text-based PLC programming language uses short, abbreviated instructions that represent basic PLC operations?

Which text-based PLC programming language uses short, abbreviated instructions that represent basic PLC operations?

• A. Instruction List
• B. Structured Text
• C. Ladder Diagram
• D. Function Block Diagram

Answer: (A)

This question tests identifying a text-based PLC language that uses compact, mnemonic instructions to perform basic operations. Instruction List is the one that fits this description. It presents programs as a sequence of short codes, each representing a fundamental action in the PLC—things like load, logical operations, and store—so you read and execute line by line in a low-level, assembly-like style. The other options are either high-level or graphical: Structured Text reads like a programming language similar to Pascal, while Ladder Diagram and Function Block Diagram are diagrammatic representations rather than text-based mnemonics.

This question tests identifying a text-based PLC language that uses compact, mnemonic instructions to perform basic operations. Instruction List is the one that fits this description. It presents programs as a sequence of short codes, each representing a fundamental action in the PLC—things like load, logical operations, and store—so you read and execute line by line in a low-level, assembly-like style. The other options are either high-level or graphical: Structured Text reads like a programming language similar to Pascal, while Ladder Diagram and Function Block Diagram are diagrammatic representations rather than text-based mnemonics.