During decommissioning, the Logic Solver is sent a message that clears its configuration, and its outputs go to zero (the safe state for a safety system). The Logic Solver must be unlocked to be able to decommission it.
Navigate to the Logic Solver under the SIS Network.
Right-click, and then select Decommission.
Click Yes in response to the message that asks if you are sure you want to decommission the Logic Solver.