NORD Drivesystems BU0550 User Manual
Page 47
3 AWL (Instruction List, IL)
BU 0550 GB-0813
47
3.5.1.7
TON switch-on delay
If IN = TRUE is set, the timer counts upwards. If ET = PT, Q is set to TRUE and the timer stops. Q remains
TRUE as long as IN is also TRUE. With a new rising flank on IN, the timer restarts at zero. PT can be
changed while the timer is running.
The time in PT is stated in milliseconds. This enables a time delay between 5ms and 24.8 days. As the time
base of the PLC is 5ms, the minimum time delay is also 5ms.
Here, literals can be used for simplified input, e.g.
LD TIME#50s20ms
= 50.020 seconds
LD TIME#1d30m
= 1 day and 30 minutes
IN
Q
PT
CV
Table 65 TON switch-on delay
NOTE
The time ET runs independently from the PLC cycle. Starting of the timer with IN and setting of
the output Q is only executed with the function call-up "CAL". The function call-up takes place
within a PLC cycle. However, with PLC programs which are longer than 5 ms this may result in
the occurrence of jitter.
VAR_INPUT
VAR_OUTPUT
Input
Explanation
Type
Output
Explanation
Type
IN
Timer active
BOOL
Q
TRUE
( IN=TRUE & ET=PT )
BOOL
PT
Duration
DINT
ET
Current timer reading
DINT