Quick Answer AB PLC2/15 Timers

Hi, Apologies if I am asking a dumb question. I am converting AB PLC2/Mini15 to GE. It is many years since I did AB. My question is the timer done / running bits.

Can someone confirm the actions of bits 15 & 17.
Which is running, which is done.
Does the running bit stay on when done bit operates.

Thanks in advance

Bit 15(octal) is Done (.DN)
Bit 17(octal) is Enable (.EN)
Enable stay on while condition is true, even DN comes on