Falling Edge Detector - Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual

28.2

Falling Edge Detector

F_TRIG(_E)
These function blocks detect the falling edge of a signal, and output a pulse signal.
Ladder diagram, FBD/LD
[Without EN/ENO]
s d
Setting data
■Descriptions, types, and data types
Argument
EN
s(CLK)
ENO
d(Q)
Processing details
■Operation processing
When (s) turns OFF, (d) is turned ON only for one scan.
■Operation result
1.
Function block without EN/ENO
The operation processing is executed. The operation output value is output from (d).
• Timing chart
ON
(s)
OFF OFF
ON
(d)
OFF
(1)
(1): On the falling edge of (s), (d) turns on.
(2): At the next scan, (d) turns off.
28 EDGE DETECTION FUNCTION BLOCKS
1056
28.2 Falling Edge Detector
[With EN/ENO]
EN ENO
s d
Description
Execution condition (TRUE: Execution, FALSE: Stop)
Falling edge detector input
Output status (TRUE: Normal, FALSE: Abnormal)
Output
ON ON
OFF OFF
ON ON
(2)
Structured text
[Without EN/ENO]
F_TRIG_1(CLK:=s,Q:=d);
[With EN/ENO]
F_TRIG_E_1(EN:=EN, ENO:=ENO CLK:=s,Q:=d);
ON ON
OFF OFF
ON ON
OFF
Type Data type
Input variable BOOL
Input variable BOOL
Output variable BOOL
Output variable BOOL
ON
OFF
ON