code: def processing_blocks(self):
          
          sbi_ids = Subarray(self.get_name()).sbi_ids
          pbs = []
          for sbi_id in sbi_ids:
              sbi = SchedulingBlockInstance(sbi_id)
              pbs.append(sbi.processing_block_ids)
          return 'PB', pbs
docs: Return list of PBs associated with the subarray.
  
          <http://www.esrf.eu/computing/cs/tango/pytango/v920/server_api/server.html#PyTango.server.pipe>