Hour Meter

I have a control program in RSLogix 5 that controls a process. I would like to add a “Total Run Hours” hour meter to display the total run hours on the Data-Liner Display 2706. The PLC type is AB PLC5/20.

I want to know if it is possible to use the processor clock (status file S21 S22 S23) to implement this Hour Meter. If so, how this can be done on RSLogix 5?

Thanks.