Locked logic solver functionality

You can apply a software lock to logic solvers to prevent inadvertent changes. To lock or unlock a logic solver, select a logic solver in Explorer or Diagnostics. You must have SIS Can Download privilege to lock and unlock a logic solver.

When a logic solver is locked, some operations are prevented, as shown below.

• Control Studio prevents:
  • Entering debug mode when editing SIS modules
  • Making online changes to parameters categorized as tuning (only for CSLS major revision 2 and later)
    Note

    The Enhanced access control for function block parameters check box on the CSLS properties (Security tab) dialog must be selected to enable access control for online changes.

• DeltaV Explorer prevents:
  • Decommissioning the logic solver
  • Deleting the logic solver
  • Downloading the logic solver
    Note

    The system also prevents downloads to logic solvers if the hosting computer is locked.

• Diagnostics prevents:
  • Performing user-initiated switchovers
  • Forcing Reset on Active
  • Forcing Reset on Standby

You can make parameter changes in Control Studio On-line when a logic solver is locked.