FUNCTION_BLOCK CTD
Decrements a given value
(* Example declaration *)
CTDInst : CTD ;
(* Example in ST *)
CTDInst(CD:= VarBOOL1, LOAD:=VarBOOL2 , PV:= VarWORD1);
VarBOOL3 := CTDInst.Q ;
VarWORD2 := CTDInst.CV;
InOut:
|
Scope |
Name |
Type |
Comment |
|
Input |
CD |
BOOL |
Rising edge: Decrementing CV by one |
|
LOAD |
BOOL |
TRUE: Set CV to the start value PV |
|
|
PV |
WORD |
Start value for decrementing |
|
|
Output |
Q |
BOOL |
TRUE if CV = 0 |
|
CV |
WORD |
Current counter value |
