Standard functions

Standard functions

The Function (FUN) entries defined by the IEC 61131-3 standard. All are pure: same input → same output, no internal state. Called directly with positional or named parameters; no instance declaration needed (unlike Function Blocks).

Sub-pages

• Type-conversion — <SRC>_TO_<DST>, TRUNC, BCD_TO_INT, INT_TO_BCD. The single most-called family in matiec-strict code.
• Arithmetic — ABS, SQRT, LN, LOG, EXP, SIN, COS, TAN, ASIN, ACOS, ATAN.
• Comparison functions — GT, GE, EQ, LE, LT, NE. Variadic versions of the comparison operators for IL.
• Selection — SEL, MUX, MIN, MAX, LIMIT. Conditional value-picking without an IF.
• String — LEN, LEFT, RIGHT, MID, CONCAT, INSERT, DELETE, REPLACE, FIND.
• Bit — SHL, SHR, ROL, ROR. Includes the matiec emit-bug warning for SHL(BYTE#1, …).

Each sub-page consolidates the whole family in one document (no per-function pages). Use the page-internal table of contents to jump to a specific function.