31.6.7.5 PBC Instruction Nesting

A PBC instruction can be programmed with up to eight levels of nesting.

When a PBC instruction is used within a PBC instruction, nesting level numbers (S1) must be incremented.

(0→1→2→3→4→5→6→7)

To release nesting levels, use a PBR instruction.

(7→6→5→4→3→2→1→0)

For example, if you release the nested PBR 5 without releasing PBR 6 and PBR 7, nesting levels down to the fifth level will be released.