Parameter F_SIL Exceeds Device Application SIL

What does 10 mean?

The 'F_SIL' parameter configured within the safety PLC, which defines the Safety Integrity Level, is set higher than what the specific device application supports. This mismatch indicates an over-specification or misconfiguration that could lead to unexpected behavior, non-compliance with safety standards, or incorrect safety function execution. The system may not operate within its validated safety limits.

• The Safety Integrity Level (SIL) configured via the F_SIL parameter in the PLC project is set higher than the certified SIL rating of the physical safety device.
• Selection of an incorrect safety device type or model in the hardware configuration that has a lower inherent SIL capability than required.
• Attempting to use a standard I/O module as a safety module, or a safety module in a non-safety certified application.
• Firmware mismatch where the PLC's F_SIL handling doesn't align with the connected device's capabilities.

Click steps to track your progress.

1. 1

   Consult the technical documentation (e.g., manual, data sheet) of the specific safety device to determine its maximum supported Safety Integrity Level (SIL).

2. 2

   Adjust the F_SIL parameter in the safety PLC's configuration (e.g., device properties) to match or be below the device's certified SIL rating.

3. 3

   If the required SIL is higher than the device's capability, consider replacing the device with one that meets the necessary SIL rating.

4. 4

   Recompile the safety PLC project and download the updated configuration to the safety PLC.

5. 5

   Perform a full safety acceptance test (SAT) after any SIL-related parameter changes.