Delta Electronics DVP15MC11T, Руководство по эксплуатации

Страница: 80 / 601

Chapter 8 Logic Instructions
8_
8.3.2 F_TRIG
FB/FC Explanation
Applicable
model
FB F_TRIG is used for the falling edge trigger. DVP15MC11T

Parameters
Parameter
name
Meaning
Input/
Output
Description Valid range
CLK
Input
signal
Input Falling edge trigger signal TRUE or FALSE
Q
Output
signal
Output Output for a period TRUE or FALSE
B
ool
ean
Bit string Integer
Real
number
Time, date
St
rin
g
B
O
O
L
BYT
E
WO
RD
D
WO
R
D
L
W
O
R
D
U
SI
N
T
U
IN
T
U
DI
NT
U
L
INT
SI
N
T
IN
T
D
IN
T
L
IN
T
R
EAL
L
R
EAL
T
IM
E
D
AT
E
TOD D
T
ST
R
IN
G
CLK
●
Q
●
Note:
The symbol
●
indicates that the parameter is allowed to connect to the variable or constant of the data type.

Function Explanation
When CLK of F_TRIG changes from TRUE to FALSE, Q output is TRUE for only one period. In other
circumstances, Q is FALSE.

Precautions for Correct Use
Q will have no output until the falling edge signal at CLK is detected.

Programming Example

The variable table and program
Variable name Data type Initial value
F_TRG F_TRIG
F_TRG_EN BOOL FALSE
F_TRG_CLK BOOL FALSE
F_TRG_Q BOOL
F_TRI G
EN E NO
CL K
Q
F_TRIG _inst anc e
1
F_TRI G
EN E NO
CLK Q
F_TRG
F_TRG_EN
F_TRG_CLK
F_TRG_Q
8-9