Unassign an SLS 1508 Logic Solver The Logic Solver to be unassigned must first be decommissioned. Navigate to the Logic Solver under the SIS Network. Right-click, and then select Unassign. Note: A message appears stating the current assignment and asking if you wish to unassign this Logic Solver. Click Yes to unassign the Logic Solver. Decommission an SLS 1508 Logic Solver