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 statusof the input signalExpired time:The duration for which output Q has already been active is available at output ET wherethe maximum value of this output can be equal to the value of PT. When input INchanges to 0 output ET is reset, however, this only occurs after PT has expired.14.2.5 SFB 4 - TON - Create turn-on delaySFB 4 can be used to delay a rising edge by period PT. Here you have the followingcharacteristics: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 hasexpired. Q then remains set until the IN input changes to 0 again. If the IN inputchanges 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 INinput. Its maximum value is the value of the PT input. ET is reset when the IN inputchanges to "0".n When it is necessary that the instances of this SFB are initialized after a restart, thenthe respective instances must be initialized in OB 100 with PT = 0 ms.QETDescriptionTiming diagramVIPA SPEED7Integrated StandardSystem Function Blocks > SFB 4 - TON - Create turn-on delayHB00 | OPL_SP7 | Operation list | en | 18-30734
