Limits

Limits

Block name

B82_LIMITS

ST call

PROGRAM TEST2_B82
 VAR 
 FB : LIB.CORE.V1_2.B82_LIMITS;
 IN_V:REAL;
 MAXIMUM_V:REAL:=20;
 MINIMUM_V:REAL:=0;
 OUT_V:REAL;
 END_VAR
FB(IN:=IN_V, MAXIMUM:=MAXIMUM_V, MINIMUM:=MINIMUM_V);
OUT_V:=FB.OUT;
END_PROGRAM

Library

LIB\CORE

Version

V1.2

Description

The block is limitating the input signal by upper and lower bounds. Using one limit only is possible, the other limit is infinite or -infinite.

Inputs

Input	Type	Description	Default value
IN	REAL	Input signal	0
MAXIMUM	REAL	Upper signal limit	1
MINIMUM	REAL	Lower signal limit	0
MAXON	BOOL	Enable upper limit	True
MINON	BOOL	Enable lower limit	True

Outputs

Output	Type	Description
OUT	REAL	Limited output signal
SIGN	BOOL	Sign of the output signal

Function

The block limits the input signal x by upper and lower limit.

When minon=true, the signal x is limited by the lower bound minimum.
When minon=false, the low limit is not used.

When maxon=true, the signal x is limited by the upper bound maximum.
When maxon=false, the high limit is not used.

Output sign is the sign of the output y. If y>= 0 then sign=true, otherwise sign=false.

Function in case of incorrect setting

When minon=maxon=true and maximum<minimum then y=maximum (lower value of both).

Application example

Function B82 with upper limit maximum=100.

Older version

Version V1.0 was defined as a function. V1.1 is defined as a function block, therefore it can bes added to graphs and it can be set tu manual mode. Functionality remains without change.

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