Mechanical and electrical configuration
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X20 system User's Manual 3.10
3.21 Safe cutoff
3.21.1 General information
The operating principle "Safe cutoff of a potential group" allows the user to implement safety functions that satisfy
the requirements of ISO 13849 within a B&R system when using an external safety relay.
The safety function is limited to cutting off or interrupting the power to the connected actuators.
Functionality
An external safety relay is connected to the I/O supply for the potential group. When the functional safe state is
requested or a "Failsafe" state occurs, then this safety relay cuts off the I/O supply of the potential group. The
power is then also cut off for all actuators connected to this potential group.
3.21.2 Scope of application / Standards referenced
The operating principle is confined to machine manufacturing applications, and therefore implicitly to the following
standards:
•
ISO 13849-1:2007 and ISO 13849-2:2013
Requirements of other standards are not taken into consideration.
3.21.3 Intended use
It is the user's responsibility to clarify guidelines for the use of safety-related B&R components with the respective
authorities and to ensure these guidelines are met.
B&R will not assume warranty or liability for damages that occur due to:
•
Improper use
•
Non-observance of standards and guidelines
•
Unauthorized modifications to devices, connections and settings
•
Operation of unauthorized or unsuitable devices or device groups
•
Failure to follow the safety notices covered in this manual
•
Malfunctions caused by the external safety relay
3.21.4 Qualified personnel
Safety functionality is only permitted to be implemented by personnel with appropriate training in safety technology
and knowledge of applicable regulatory and technical requirements.
Use of safety-related products is restricted to the following persons:
•
Qualified personnel who are familiar with relevant safety concepts for automation technology as well as
applicable standards and regulations
•
Qualified personnel who plan, develop, install and commission safety equipment in machines and systems
Qualified personnel in the context of this manual's safety guidelines are those who, because of their training,
experience and instruction combined with their knowledge of relevant standards, regulations, accident prevention
guidelines and operating conditions, are qualified to carry out essential tasks and recognize and avoid potentially
dangerous situations.
In this regard, sufficient language skills are also required in order to be able to properly understand this manual.
Summary of Contents for X20 System
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