Episode 10 — Explain Control Logic Foundations: Ladder Logic, FBD, Structured Text, and SFC

This episode introduces control logic languages and representations at a level that supports security and troubleshooting decisions without turning you into a controls programmer. You’ll define Ladder Logic as a relay-like representation that maps well to discrete control, Function Block Diagram (FBD) as a modular representation common in process environments, Structured Text as a more code-like approach suited to complex logic, and Sequential Function Chart (SFC) as a step-and-transition model for sequences. We explain how these forms influence change control, review processes, and how errors appear, which matters when exam questions ask what to check first or how to reduce risk during modifications. You’ll learn best practices for logic management such as version control, test environments, approvals, and rollback planning, emphasizing that unreviewed logic changes are both safety and security events. The episode also covers common failure patterns like incorrect interlocks, timer misconfigurations, and unsafe default states, and how to reason through them using operational priorities. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.