JMP & JSR

we are learning to use jump and jump subroutine on the slc500 fixed, and when we enter a "000" for the decimal label value, the plc converts it to numbers like Q02?! can anyone explain this translation?

"Q" prefix values are the default 'Data Table' (not really a DT) for Labels, which are the targets of JMP instructions (NOT JSR).

The "Q" is used, so that you can attach documentation to the JMP and LBL instructions.