Attention

IronPLC can only run very simple programs. The steps described are accurate but many language features are not yet supported.

Standard Library

IronPLC provides the standard functions and function blocks defined by IEC 61131-3. These are available in all programming languages.

Tip

Examples on supported function pages are interactive — you can edit and run them directly in the IronPLC Playground.

Functions

Function	Description	Status
ABS	Absolute value	Supported
SQRT	Square root	Supported (REAL, LREAL)
LN	Natural logarithm	Supported (REAL, LREAL)
LOG	Base-10 logarithm	Supported (REAL, LREAL)
EXP	Natural exponential	Supported (REAL, LREAL)
EXPT	Exponentiation	Supported
SIN	Sine	Supported (REAL, LREAL)
COS	Cosine	Supported (REAL, LREAL)
TAN	Tangent	Supported (REAL, LREAL)
ASIN	Arc sine	Supported (REAL, LREAL)
ACOS	Arc cosine	Supported (REAL, LREAL)
ATAN	Arc tangent	Supported (REAL, LREAL)
ADD	Addition	Supported
SUB	Subtraction	Supported
MUL	Multiplication	Supported
DIV	Division	Supported
MOD	Modulo	Supported
GT	Greater than	Supported
GE	Greater than or equal	Supported
EQ	Equal	Supported
LE	Less than or equal	Supported
LT	Less than	Supported
NE	Not equal	Supported
SEL	Binary selection	Supported
MAX	Maximum	Supported
MIN	Minimum	Supported
LIMIT	Clamp to range	Supported
MUX	Multiplexer	Supported
SHL	Shift left	Supported
SHR	Shift right	Supported
ROL	Rotate left	Supported
ROR	Rotate right	Supported
LEN	String length	Supported
LEFT	Left substring	Supported
RIGHT	Right substring	Supported
MID	Middle substring	Supported
CONCAT	String concatenation	Supported
INSERT	String insertion	Supported
DELETE	String deletion	Supported
REPLACE	String replacement	Supported
FIND	String search	Supported
Type conversions	Type conversion functions	Supported

Function Blocks

Function Block	Description	Status
TON	On-delay timer	Not yet supported
TOF	Off-delay timer	Not yet supported
TP	Pulse timer	Not yet supported
CTU	Count up	Not yet supported
CTD	Count down	Not yet supported
CTUD	Count up/down	Not yet supported
R_TRIG	Rising edge detection	Not yet supported
F_TRIG	Falling edge detection	Not yet supported
SR	Set/reset flip-flop	Not yet supported
RS	Reset/set flip-flop	Not yet supported