CTUD (count up down)

The CTUD instruction counts integers from 0 up to a given value, one by one, or from a given value down to 0, one by one.
Languages supported: Function block diagram, ladder diagram, structured text.
This instruction applies to the Micro810, L20E, L50E, and L70E controllers.
CTUD
CTUD
CTUD parameters
Parameter
Parameter Type
Data Type
Description
CU
Input
BOOL
TRUE: Rising Edge detected, count up.
CD
Input
BOOL
TRUE: Rising Edge detected, count down.
RESET
Input
BOOL
Reset dominant (highest priority when determining instruction behavior) command. (CV = 0 when RESET is TRUE).
LOAD
Input
BOOL
Load command.
TRUE: Set CV = PV.
PV
Input
DINT
Programmed maximum value.
QU
Output
BOOL
Overflow.
TRUE: When CV >= PV.
QD
Output
BOOL
Underflow.
TRUE: When CV <= 0.
CV
Output
DINT
Counter result.

CTUD examples

CTUD function block diagram example
CTUD function block diagram example
CTUD ladder diagram example
CTUD ladder diagram example
CTUD structured text example
CTUD structured text example
(* ST Equivalence: We suppose CTUD1 is an instance of block*)
        
CTUD1(trigger1, trigger2, reset_cmd, load_cmd,100);
        
full := CTUD1.QU;
        
empty := CTUD1.QD;
        
nb_elt := CTUD1.CV;
Results
Results
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