DVP-15MC Series Motion Controller Operation Manual
8-56
FB/FC
FB
CTD is used as a down counter.
Parameters
Meaning
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
Boolean
Bit string Integer
Real
number
Time, date
String
REAL
STRING
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 ENO
Q
CTD_instance
CD
Load
CV
PV