PT must be positive. The range of these values is determined by data type TIME.
Output Q:
Output Q remains active for the pulse duration PT, irrespective of the subsequent status
of the input signal
Expired time:
The duration for which output Q has already been active is available at output ET where
the maximum value of this output can be equal to the value of PT. When input IN
changes to 0 output ET is reset, however, this only occurs after PT has expired.
14.2.5 SFB 4 - TON - Create turn-on delay
SFB 4 can be used to delay a rising edge by period PT. Here you have the following
characteristics:
n The timer runs only in the STARTUP and RUN modes.
n A rising edge at the IN input causes a rising edge at output Q after the time PT has
expired. Q then remains set until the IN input changes to 0 again. If the IN input
changes to "0" before the time PT has expired, output Q remains set to "0".
n The ET output provides the time that has passed since the last rising edge at the IN
input. Its maximum value is the value of the PT input. ET is reset when the IN input
changes to "0".
n When it is necessary that the instances of this SFB are initialized after a restart, then
the respective instances must be initialized in OB 100 with PT = 0 ms.
Q
ET
Description
Timing diagram
VIPA SPEED7
Integrated Standard
System Function Blocks > SFB 4 - TON - Create turn-on delay
HB00 | OPL_SP7 | Operation list | en | 18-30 734
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