It is possible. You have to map the UOP signals to rack 48, slot 1 and the start address of the digital inputs and outputs you want to use (MENU > I/O > UOP > CONFIG). Also make sure the wiring between your PLC and the JRM18 connector or terminal conversion module is correct.
According to the manual you can also map UI to rack 48, slot 1, start 14. In that case, Reset and CSTOPI will be mapped to the same digital input. You could also change the UOP auto assignment to e.g. Full and map the signals in a way you need it.