Delta Electronics DVP15MC11T, Operation Manual

Page: 119 / 601

DVP15MC11T Operation Manual
_8
8.7.2 CTD
FB/FC Explanation
Applicable
model
FB CTD is used as a down counter. DVP15MC11T

Parameters
Parameter
name
Meaning
Input/
Output
Description Valid range
CD
Down-counter
input signal
Input Control the counter to start counting down TRUE or FALSE
Load Load signal Input For writing the down-counter value TRUE or FALSE
PV Preset value Input Counter setting value 0 ~ 4294967295
Q Output signal Output
Q is TRUE when the counter counts down
to 0.
TRUE or FALSE
CV Counter value Output Counter present value 0 ~ 4294967295
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
CU
●
Load
●
PV
●
Q
●
CV
●
Note:
The symbol
●
indicates that the parameter is allowed to connect to the variable or constant of the data type.

Function Explanation

CTU functions as a down counter.

When Load is reset to FALSE after being set to TRUE, the value of PV is written to CV . When CD
changes from FALSE to TRUE, the counter makes the counter value decreased once and the value
of
CV is decreased by 1. When the value of CV reaches 0, Q is TRUE.

Precautions for Correct Use
While Load is TRUE, the counter will not count down.
CTD
EN E NO
Q
CTD_ins ta nce
CD
Load
CV
PV
8-48