S7-1200 timer

Hi All

I am struggling to get a TON in TIA v15 to work properly (s7_1212). I have tried reading what i can but still dont understand why what i have is not working. 

I have attached a screen shot.

I am trying to achieve a bit that is active for 1 scan cycle and resets every second. Coil1 is just staying active however and not resetting the timer. 

What i have written works in Connected Components Workbench and other plc software i have used. What am i doing wrong?
Thank you in advance.

Trevor