To Covert .pld to .pll we must follow the steps as given below. Here we are generating .pll from .pld file.
In 11i Converting .pld file in .PLL File
f60gen Module=XXSXDO.pld Userid=apps/***** parse=yes Module_Type=LIBRARY
In R12 Converting .pld file in .PLL File
frmcmp_batch Module=XXSXDO.pld Userid=apps/***** parse=yes Module_Type=LIBRARY
To Generate .plx from .pll
Once you convert .pld into .pll, you can generate .plx from converted .pll as below.
frmcmp_batch userid=apps/***** module=$AU_TOP/12.0.0/resource/PNTLEASE.pll output_file=$AU_TOP/12.0.0/resource/PNTLEASE.plx module_type=LIBRARY compile_all=special