Flow Ctrl Tech Engineering

IEC 61131-3 Languages Compared: Ladder, Structured Text, FBD, SFC & IL

Detailed comparison of all five IEC 61131-3 programming languages: when to write Structured Text, when to use Ladder Logic, and how to build sequential state machines in SFC.

  • Ladder Diagram is best for discrete interlocks, safety permissives, and field electrician troubleshooting.
  • Structured Text is superior for mathematical formulas, array manipulation, string parsing, and communication protocols.
  • Sequential Function Chart (SFC) cleanly models multi-stage batch processes, clean-in-place (CIP), and packaging recipes.

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.