To determine if a 1099R income is taxable by PA, consult this guide: https://revenue-pa.custhelp.com/app/answers/detail/a_id/1470/~/how-do-i-know-if-the-amount-on-my-109...
Note that if box 7 of the 1099R contains a D, it is taxable by PA to the same extent as on the federal return. The amount in box 2 of the 1099R will be reported as interest on the PA return.
