Rockwell Automation Safety Function: Hinge Switch - Manual (Page 3)

Safety Function: Hinge Switch 3
Rockwell Automation Publication SAFETY-AT096A-EN-P – November 2013
General Safety Information
Contact Rockwell Automation to find out more about our safety risk assessment
services.
IMPORTANT This application example is for advanced users and
assumes that you are trained and experienced in safety
system requirements.
ATTENTION: Perform a risk assessment to make sure all
task and hazard combinations have been identified and
addressed. The risk assessment can require additional
circuitry to reduce the risk to a tolerable level. Safety circuits
must take into consideration safety distance calculations,
which are not part of the scope of this document.
Table of Contents
Important User Information ....................................................................................... 2
General Safety Information ....................................................................................... 3
Introduction ............................................................................................................... 3
Safety Function Realization: Risk Assessment ......................................................... 3
Hinge Interlock Switch Safety Function ..................................................................... 4
Safety Function Requirements .................................................................................. 4
Functional Safety Description ................................................................................... 5
Bill of Material ........................................................................................................... 5
Setup and Wiring ...................................................................................................... 6
Configuration ............................................................................................................ 7
Calculation of the Performance Level ........................................................................ 8
Verification and Validation Plan ............................................................................... 11
Additional Resources .............................................................................................. 16
Introduction
This application technique explains how to wire and configure an Ensign 3 hinge
interlock switch and an E-stop as input devices, with a Guardmaster ® dual-input
safety relay (GSR DI) as the logic control and two 100S safety contactors as the
output devices to create an integrated safety system.
Safety Function Realization: Risk Assessment
The required performance level is the result of a risk assessment and refers to the
amount of the risk reduction to be carried out by the safety-related parts of the
control system. Part of the risk reduction process is to determine the safety functions
of the machine. In this application, the performance level required (PLr) by the risk
assessment is Category 3, Performance Level d (CAT. 3, PLd), for each safety
function. A safety system that achieves CAT. 3, PLd, or higher, can be considered
control reliable. Each safety product has its own rating and can be combined to
create a safety function that meets or exceeds the PLr.