EcoStruxure™ Control Expert - System Bits and Words, Reference Manual

The document describes the system bits and system words used in EcoStruxure Control Expert for Modicon controllers, detailing their functions, behaviors, and interactions within automation applications. It explains how these internal indicators support controller operation, task management, communication processes, diagnostics, real-time clock handling, memory management, and hardware status monitoring. The document covers multiple controller families, including Modicon M340, Modicon M580, Modicon Premium, Modicon Atrium, Modicon Quantum, and Modicon Momentum, highlighting specific features for each platform. It also provides references to related documentation, configuration considerations, and implementation guidelines for consistent and efficient use of system variables across automation projects.