I want to develop FBD program in AC500 PLC, to calculate a machine Run Time & Down Time. (Run time+Down Time=12hrs

A machine runs in two shifts. Each shift is of 12 hours a day. Machine On/Off status is received by a hardware DI signal to AC500 PLC. We need to show the 'Run Time/On Time' & 'Down Time/Off Time' of the machine in each shift. Total number of machines are 250. We want to develop PLC logic in FBD. Is it possible to use a Pause Timer in AC500 PLC? If yes, please provide the library for the same. Else suggest me some programming concept that could help me deal with the same. Matter is urgent. I have tried many different FBD programs but facing several problems. I am attaching an image of the FBD program that was more likely to work for me.