In the described control logic framework, how many distinct basic elements are identified?

• A. Five
• B. Six
• C. Seven
• D. Eight

Answer: (B)

Six distinct basic elements are identified in this control logic framework. The design treats six primitive roles as the building blocks: input sensing, decision processing, actuation, state or data storage, signaling or communication pathways, and the operator interface or alarms. Each element handles a fundamental function: sensing captures real-world conditions; processing makes decisions based on rules; actuation carries out those decisions; storage retains past states or data; communication moves information between parts of the system; the interface keeps the operator informed and allows intervention. Defining six separate elements ensures clear responsibilities and easy composition of the system. A count of five would miss an essential role, while seven or eight would add extra categories beyond what the framework defines, leading to redundancy.