Lenze DDS v2.3 - Manual (Page 310)

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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 TOF’s 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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