OK, I'm not positive about this because I don't have any PLC programs on this machine. I do have PCWin and the manuals though.
I believe that you can view the accumulator status of the timer by just looking at the value in the timer's (T/C) address.
Because the timer's accumulator value will be changing very rapidly, I would first try to do this by checking that it is within some range of values by using the W>N and W<N (Word compare greater than, word compare less than) instructions.
Do you have the programming manual for the processor you are working on?