CODESYS LIMIT

LIMIT is an IEC selection operator in the CODESYS development system that limits a value to a range. It is written as OUT := LIMIT(Min, IN, Max) and is equivalent to OUT := MIN(MAX(IN, Min), Max), so a value above Max returns Max and a value below Min returns Min. The source gives the example Var1 := LIMIT(30,90,80); which returns 80.

Source checked13/13 values · 2026-10-26

Specification

2 sources

Language	structured text
Code	LIMIT
Group	selection operator
Syntax	OUT := LIMIT(Min, IN, Max)
Dialect	CODESYS

Parameters

Name	Description	Data type
Min	Lower limit for the result.
IN	Value to be limited.	all
Max	Upper limit for the result.
OUT	Result of the limiting operation.	all

Study notes

LIMIT is described as an IEC selection operator and is used for limiting.
The call form is OUT := LIMIT(Min, IN, Max).
It is equivalent to OUT := MIN(MAX(IN, Min), Max).
Max is the upper limit of the result; if IN is above Max, LIMIT yields Max.
Min is the lower limit of the result; if IN is below Min, the result is Min.
Permitted data types for IN and OUT: all.
Example: Var1 := LIMIT(30,90,80); gives the result 80 in Var1.