Logix SIS Safety Concept
The Safety Integrity Level (SIL) is the relative level of risk-reduction that is provided by a safety function.
Logix SIS is rated for the following SIL and Performance Level (PL) functional safety standards.
Certification | Rating |
|---|---|
IEC 61508 | Type-approved and certified for use in safety applications up to and including the following:
|
IEC 62061 | Suitable for use in safety applications up to and including the following:
|
IEC 61511 | Suitable for use in safety applications up to and including the following:
|
ISO 13849-1 | Suitable for use in safety applications up to and including the following: Performance Level PLe (Cat. 3) |
Understand the following conventions used throughout this documentation:
- SIL 2 represents SIL 2, SIL CL 2, and PLd
- SIL 3 represents SIL 3, SIL CL 3, and PLe
- MRT refers to both MRT (mean repair time) and MTTR (mean time to respond). The diagnostic time to detect a failure is so quick that MRT is effectively equivalent to MTTR for our products.
TÜV Rheinland has approved Logix SIS for use in safety-related applications where the de-energized state is considered to be the safe state.
All I/O examples in this manual are based on achieving de-energization as the safe state for typical machine safety and emergency shutdown (ESD) systems.
IMPORTANT:
As the system user, you are responsible for these items:
- The setup, SIL rating, and validation of any sensors or actuators that are connected to the system
- Project management and functional test
- Access control to the safety system, including password management
- Application programming and the device configurations in accordance with the information in this safety reference manual and the Redundancy Systems User Manual, publication 1756-UM015.
When applying functional safety, restrict access to qualified, authorized personnel who are trained and experienced.
Use the
Studio 5000 Logix Designer®
application to create programs for safety controllers.
IMPORTANT:
Only the safety task, not standard tasks, can be used for safety functions.
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