Functional Verification Tests. Allen-Bradley Rockwell Automation 1734-AENT

Chapter 1 Safety Integrity Level (SIL) Concept

The TÜV Rheinland has approved GuardLogix controller systems for use in safety-related applications up to SIL 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.

IMPORTANT

The system user is responsible for:

• the set-up, 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 .

When applying Functional Safety, restrict access to qualified, authorized personnel who are trained and experienced. The safety-lock function, with passwords, is provided in RSLogix 5000 software.

For information on using the safety-lock feature, refer to the

GuardLogix Controllers User Manual, publication 1756-UM020 or the

1768 Compact GuardLogix Controllers User Manual publication

1768-UM002 .

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 timeframe 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.

IMPORTANT

Your specific applications determine the timeframe for the functional verification test interval. However this is mainly related to Safety I/O modules and field instrumentation.

For more information on the requirements of a functional verification

test, see Project Verification Test on pages 57

and 58 .

14 Publication 1756-RM093F-EN-P - January 2010