Siemens SINUMERIK 808D ADVANCED Training Manual page 85

PLC program
design and
adjustment
Operation symbols of PLC programming language
Timers
Timer: T
Form;
condition of timer bit T3, T25; — represent the
comparison result of timer value and preset value
timer value T3, T25; — represent timer value
Style;
open delay timer TON IN=1 begin timing ；IN=0
timer resetting ；count value>preset value T
close delay timer TOF IN=1 timer resetting ；IN=0
begin timing; count value>preset value T
keep delay timer CTUD IN=1begin timing;
IN=0timer stops; count value>preset value T
Assign word constant0" to T
808D ADVANCED Turning and Milling
=1
n
=0
n
1
n
to make counter composite
Keep the sequence
Timer enable
preset value PV
timer value
Timer bit T
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Commissioning Guide