Industrial PLCs vs Standard Embedded Systems: Architecture, Scan Cycles & Determinism

An engineering breakdown of Industrial PLCs versus standard embedded microcontrollers (STM32, ESP32, bare-metal/RTOS). Key Topics Covered: Hardware Abstraction & Lifecycle: 15-20+ year industrial lifecycles vs. rapid 3-7 year MCU obsolescence Electrical Resilience: Industrial 24V transients, optoisolation, and EMI/RFI shielding vs. bespoke board design The Execution Paradigm: The cyclic PLC scan cycle (Read Inputs -] Execute Logic -] Write Outputs) vs interrupt-driven loops Deterministic Watchdogs: Sub-millisecond timing and fault-trip safety ([10ms watchdogs) IEC 61131-3 Programming: Real-world comparisons between Ladder Diagram (LD), Function Block Diagram (FBD), and Structured Text (ST) Timestamps & Outline: 00:00 - Two Worlds of Control: PLC vs. Embedded 04:15 - Execution Models: Determinism vs Flexibility 08:30 - The Cyclic Scan Routine & Watchdogs 12:45 - Programming Languages: LD, FBD, and Structured Text 18:20 - Industrial Automation Takeaways Stay connected for more hardware and embedded systems content: Website & Resources: https://example.com Community:   / discord   #PLC #EmbeddedSystems #IndustrialAutomation #SCADA #IEC61131 #STM32 #HardwareEngineering