CTUD

Counts (integer) from 0 up to a given value 1 by 1 or from a given value down to 0 1 by 1

Arguments
CU	BOOL	Up-counting (when CU is a rising edge)
CD	BOOL	Down-counting (when CD is a rising edge)
RESE	BOOL	Reset command (dominant) (CV = 0 when RESET is TRUE)
LOAD	BOOL	Load command (CV = PV when LOAD is TRUE)
PV	DINT	Programmed maximum value
QU	BOOL	Overflow: TRUE when CV >= PV
QD	BOOL	Underflow: TRUE when CV <= 0
CV	DINT	Counter result

Example

(* FBD program using the CTUD block *)

(* 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;

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