Flow Ctrl Tech Engineering

State Machine Design Patterns for PLCs: Robust Machine Sequencing in Structured Text

How to build deterministic, crash-proof industrial state machines using ENUMs and CASE statements in Structured Text. Includes PackML state model principles.

  • Finite State Machines eliminate race conditions and conflicting concurrent output commands.
  • Using strongly-typed ENUMs makes Structured Text readable and prevents invalid integer state jumping.
  • Every state must feature an explicit watchdog timer to detect mechanical actuator stalls.

Flow Ctrl Tech Engineering: Turnkey industrial automation, PLC programming, SCADA development, HMI, fieldbuses, and IIoT architectures. Contact our engineering center at [email protected] or phone +91 91110 91005.