Lenze DDS v2.3 Manual do Utilizador Página 310

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Drive PLC Developer Studio
IEC 61131-3 Standard functions
14-18
l
DDS EN 2.3
14.7.3 TOF
Timer off-delay
TOF(IN, PT, Q, ET) means:
IN and PT are input variables of type BOOL or TIME.
Q and ET are output variables of type BOOL or TIME.
As soon as IN is FALSE, ET will count the time in milliseconds until the value equals that in
PT and then remain the same.
Q is FALSE if IN is FALSE and ET equals PT. Otherwise Q returns TRUE.
Q thus has a falling edge when the time set in milliseconds in PT has expired.
Graphic representation of TOFs time sequence:
Examples
Declaration:
TOFInst : TOF;
IL FBD
CAL TOFInst(IN:=VarBOOL1, PT:=T#5s)
LD TOFInst.Q
ST VarBOOL2
ST
TOFInst(IN:=VarBOOL1, PT:=T#5s);
VarBOOL2:=TOFInst.Q;
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