JUMO LOGOSCREEN 700 User Manual

9 Function modules
58
9.6 Falling edge detection
This function module detects a falling edge (transition 1 -> 0) .
Call
F_TRIG<instance> (CLK);
Input
Output
Comment
The operating principle of the function module corresponds to the following program code:
VAR CLK : BOOL; END_VAR
VAR Q : BOOL; END_VAR
VAR M : BOOL := TRUE; END_VAR
Q := NOT CLK AND NOT M;
M := NOT CLK;
The Q output remains at its Boolean value from one call until the next. It follows the transition of the input
signal (CLK) from "1" to "0" and returns to "0" the next time it is called.
Example with R_TRIG and F_TRIG
IF reset_flag THEN
bool_out01 := FALSE;
bool_out02 := FALSE;
END IF;
R_TRIG01 (bool_in01);
(* detection of a rising edge at input bool_in01 *)
bool_out01 := R_TRIG01.Q;
(* short pulse at output bool_out01 for rising edge at input *)
Parameter Data type Description
<Instance> 01 to xx (specify instance with two digits)
CLK BOOL Due to a falling edge (1 -> 0) at CLK, Q = TRUE
Parameter Data type Query
Q BOOL OUT := F_TRIG<instance>.Q;
bool_out02
bool_in01
bool_out01
t
t
t

JUMO LOGOSCREEN 700 Specifications

General

Brand	JUMO
Model	LOGOSCREEN 700
Category	Measuring Instruments
Language	English