Factories don’t run on magic. They run on control panels that turn raw sensor data into precise, safe action—and we’re kicking off a three‑part series to show exactly how. We break down the essentials in plain language so you can open a panel door and actually know what you’re seeing, from the disconnect and power supplies to the PLC logic and the HMI screens operators trust. We start with the PLC, the rugged brain that reads inputs, executes logic, and drives outputs with millisecond timing. You’ll learn why modern controllers are networked, how modular I/O scales with your process, and what clean wiring and accurate channel maps do for uptime. Then we shift to the HMI, the operator window into the process. A well‑built screen mirrors the machine, makes status obvious, and keeps routine actions outside the enclosure for safer work. Clear colors, readable values, trends, and alarms turn data into smart, fast decisions. Power is the quiet foundation. We walk through the pathway: visible disconnects, fuses and breakers sized for protection, control transformers that step down voltage, and 24 VDC power supplies that feed sensors, relays, and PLC cards. Grounding, spacing, and heat management guard both people and electronics. Along the way, we share practical tips to read a panel like a map: trace power first, find the PLC and I/O, compare HMI values to the machine, and rely on current drawings stored on the door. These habits, backed by UL 508A and NFPA 79 principles, create safer, more reliable systems that technicians can troubleshoot under pressure. With nearly a century of experience supporting automation across industries, we believe craftsmanship and documentation are force multipliers. If you’re new to automation, mentoring someone who is, or just want a refresher, this guide will raise your confidence on the plant floor. Subscribe for the next parts of the series, share this with a colleague who needs it, and leave a quick review to help more pros find the show. Keep Asking Why... Read our latest article on Industrial Manufacturing here https://eecoonline.com/inspire/panels_101 Online Account Registration: Video Explanation of Registering for an Account Register for an Account Other Resources to help with your journey: Installed Asset Analysis Support System Planning Support Schedule your Visit to a Lab in North or South Carolina Schedule your Visit to a Lab in Virginia Submit your questions and feedback to: podcast@eecoaskwhy.com Follow EECO on LinkedIn Host: Chris Grainger
