s7-300 time delay interrupt.

[waqas_here]

s7-300 interrupts

Guys i just wanted to learn how to invoke time delay interrupt in s7-300. According to sheet OB20 is a time delay interrupt which i included in my project. Than added SFC32 (STRT_INT) in my main program to start the time delay interrupt and wrote a simple program in OB20 which in every 2 seconds must monitor I0.1, if set Q0.0 must b set and if clear Q0.0 must b clear. Atttached are the snaps of OB1, OB20. Please tell me where i m wrong as OB20 is never called in my program

Thanks

 

[waqas_here]

simatic time delay interrupt

Really wonder NO one to answer such a simple question (that's what i think).