IEC 61131-3

[06/01/2023]

IEC 61131-3: International standard for PLCs that defines the following programming languages:

  • Ladder Diagram (LD)
  • Function Block Diagram (FBD)
  • Structured Text (ST)
  • Instruction List (IL)
  • Sequential Function Chart (SFC)

SR - bistable function block, set dominant

RS - bistable function block, reset dominant

R_TRIG - raising edge detection

F_TRIG - falling edge detection