12 Rockwell Automation Publication 1756-RM093J-EN-P - April 2018
Chapter 1 Safety Integrity Level (SIL) Concept
The TÜV Rheinland has approved GuardLogix controller systems for use in
safety-related applications up to SIL CL 3, in which the de-energized state is
considered to be the safe state. All of the examples related to I/O included in this
manual are based on achieving de-energization as the safe state for typical
Machine Safety and Emergency Shutdown (ESD) Systems.
When applying Functional Safety, restrict access to qualified, authorized
personnel who are trained and experienced.
Functional Verification Tests
IEC 61508 requires the user to perform various functional verification tests of
the equipment used in the system. Functional verification tests are performed at
user-defined times. For example, functional verification test intervals can be once
a year, once every 15 years, or whatever time frame is appropriate.
GuardLogix controllers have a functional verification test interval of up to
20 years. Other components of the system, such as safety I/O modules, sensors,
and actuators may have shorter functional verification test intervals. The
controller should be included in the functional verification testing of the other
components in the safety system.
For more information on the requirements of a functional verification test, see
Project Verification Test on pages 56 and 56.
The system user is responsible for:
• the setup, SIL rating, and validation of any sensors or actuators connected
to the GuardLogix system.
• project management and functional testing.
• access control to the safety system, including password handling.
• programming the application software and the device configurations in
accordance with the information in this safety reference manual and the
GuardLogix Controllers User Manual, publication
1756-UM020
, or the 1768 Compact GuardLogix Controllers User Manual
publication 1768-UM002
.
Your specific applications determine the time frame for the functional
verification test interval. However, this is mainly related to safety I/O
modules and field instrumentation.
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