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System architectures

When it comes to actually implementing a safety application, choosing a suitable safety concept including the system architecture of the control and evaluating logic can prove just as problematic as ensuring compliance with all the requirements of the various standards. Within this context, our products range from safety relays and configurable modules to safe controllers with fieldbus connection. If the right type of technology is used, the safety-related application will not only be cost-effective and easy to implement, but will also comply with the relevant standards.

Safety devices

Quick and easy creation of simple safety systems  

Quick and easy creation of simple safety systems

Simple applications with a small number of safety functions, such as an automatic processing device with a safety door and an emergency stop button, are implemented with conventional safety devices. Electromechanical safety relays can be used here to quickly and easily create simple safety systems that meet all the requirements of standards.

Typical features of this system architecture:

  • Conventional separation of safety and function control
  • Different network and I/O devices
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Configurable safety modules

Reliable and versatile: configurable safety module  

Reliable and versatile: configurable safety module

With the size of the system increasing, it is usually not just the number of safety functions that is on the increase; additional features such as temporarily switching individual modules on and off often have to be implemented as well. Configurable safety modules are suitable for these applications.

Typical features of this system architecture:

  • Conventional separation of safety and function control
  • Common network for standard communication
  • Different I/O devices
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Network safety solutions

Safety functions: connected via the standard network  

Safety functions: connected via the standard network

More safety functions are usually required in large systems. In addition, it is not just standard signals that have to be acquired and output remotely via bus systems, but often also safe signals.

The aim is to significantly reduce the amount of wiring required and increase flexibility. Configurable safety modules, which are distributed in the network, are suitable for up to medium-sized applications. They can be operated without a safety controller or safe bus system. They exchange safety-related signals via the standard network.

Typical features of this system architecture:

  • Conventional separation of safety and function control
  • Common network for standard and safe communication
  • I/O modules including safety logic distributed in the network
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Safe control technology

Use of programmable safety controllers  

Use of programmable safety controllers

For complex applications where there are so many safety functions that it is no longer possible to implement them with the technologies described, safety controllers combined with a safe bus system are the ideal solution.

Two different solutions are available here:

1) On the one hand, remote safety controllers are available which are separated from the standard control system with their own safe network installed separately, thereby increasing the cost and time involved accordingly.

2) The second solution integrates the safe controller into the standard control system and uses the existing network for communication with the safe devices. In practice, this method has proved to be more effective technically as well as the more cost-effective option.

Typical features of this system architecture:

  • Different degrees of integration possible
  • Common communication system for standard and safe components
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Safety-related input and output modules

Use of safety-related input and output modules  

Use of safety-related input and output modules

In medium-sized to large applications, the safe signals are also acquired and output via bus systems. The safety-related input and output modules distributed in these networks communicate with the safety controller and are adapted to the application by means of flexible parameterization.

Typical features of this system architecture:

  • Distributed safe and standard input and output modules in conjunction with a safety controller
  • Common communication system for standard and safety components via a fieldbus
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Summary

The delimitation of the individual safety technologies based on the number of safety functions and the complexity of the logic operations shows that there is an easy and cost-effective solution for every application.

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PHOENIX CONTACT Ltd

8240 Parkhill Drive
Milton, Ontario L9T 5V7
1-800-890-2820

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