Attention

IronPLC implements many parts of the IEC 61131-3 standard and is working toward full Structured Text support. Key features still missing include arrays and structures. Try it out in the IronPLC Playground.

Functions

IEC 61131-3 defines a set of standard functions available in all programming languages. Functions are stateless — they produce the same output for the same inputs every time.

Numeric Functions

Function	Description	Status
ABS	Absolute value	Supported
SQRT	Square root	Supported
LN	Natural logarithm	Supported
LOG	Base-10 logarithm	Supported
EXP	Natural exponential	Supported
EXPT	Exponentiation	Supported
TRUNC	Truncate real to integer	Supported

Trigonometric Functions

Function	Description	Status
SIN	Sine	Supported
COS	Cosine	Supported
TAN	Tangent	Supported
ASIN	Arc sine	Supported
ACOS	Arc cosine	Supported
ATAN	Arc tangent	Supported

Arithmetic Functions

Function	Description	Status
ADD	Addition	Supported
SUB	Subtraction	Supported
MUL	Multiplication	Supported
DIV	Division	Supported
MOD	Modulo	Supported

Comparison Functions

Function	Description	Status
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

Assignment Functions

Function	Description	Status
MOVE	Assignment (copy value)	Supported

Selection Functions

Function	Description	Status
SEL	Binary selection	Supported
MAX	Maximum	Supported
MIN	Minimum	Supported
LIMIT	Clamp to range	Supported
MUX	Multiplexer	Not yet supported

Bit String Functions

Function	Description	Status
SHL	Shift left	Supported
SHR	Shift right	Supported
ROL	Rotate left	Supported
ROR	Rotate right	Supported

String Functions

Function	Description	Status
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 Conversion Functions

Function	Description	Status
Type conversions	Type conversion functions (*_TO_*)	Supported (numeric)
BCD_TO_INT / INT_TO_BCD	BCD conversion functions	Supported