Set the Safety Level

The safety level declares the intent of the safety application. The safety level indicates whether the project is at safety level SIL 2/PLd or SIL 3/PLe.
  • The safety level that is required for an application is based on a required risk assessment that you must perform.
  • The safety level that is achieved is determined by conformance to Safety Integrity Level (SIL) and Performance Level (PL) requirements and safety application requirements.
You must specify the safety level:
  • The default setting is SIL 2/PLd.
  • You can only modify the setting offline, when the safety application is in the Unlocked state and no safety signature exists.
  • For SIL 3/PLe, you must have a 1756-L9SP safety partner that is installed to the right of the primary controller. If you select SIL 3/PLe, a safety partner appears in the Controller Organizer I/O tree. If you change the value back to SIL 2/PLd, the safety partner disappears from the I/O tree.
Perform these tasks to set the safety level.
  1. On the Online toolbar, click the Controller Properties icon.
  2. On the Controller Properties dialog box, click the Safety tab.
  3. On the Safety tab, select the Safety Level.
  4. Click Apply and then OK.
    This image shows where to set the safety level in a Studio 5000 Logix Designer project.
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