10 Rockwell Automation Publication 750-UM002H-EN-P - February 2017
Chapter 1 Safety Concept
Important Safety Considerations
The system user is responsible for the following:
• Set-up, safety rating, and validation of any sensors or actuators
connected to the system
• Completing a system-level risk assessment and reassessing the system any
time a change is made
• Certification of the system to the desired safety performance level
• Project management and proof testing
• Programming the application software and the safety option module
configurations in accordance with the information in this manual
• Access control to the system
• Analyzing all configuration settings and choosing the proper setting to
achieve the required safety rating
Safety Category 3 Performance Definition
To achieve Safety Category 3, according to EN ISO 13849-1, design the safety-
related parts according to these guidelines:
• The safety-related parts of machine control systems and/or their
protective equipment, as well as their components, shall be designed,
constructed, selected, assembled, and combined in accordance with
relevant standards so that they can withstand expected conditions
• Basic safety principles shall be applied
• A single fault in any of its parts does not lead to a loss of safety function.
• The average diagnostic coverage of the safety-related parts of the control
system shall be medium
• The mean-time to dangerous failure of each of the redundant channels
shall be high
• Measures against common cause failure shall be applied
IMPORTANT When applying Functional Safety, restrict access to qualified, authorized
personnel who are trained and experienced.
ATTENTION: When designing your system, consider how personnel exit the
machine if the door locks while they are in the machine. Additional
safeguarding devices may be required for your specific application.
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