Industrial Ethernet communication system

SafetyNET p is defined in the IEC standards series for industrial fieldbus systems as Type 22 and CP 18 and has emerged as the standard for Ethernet-based fieldbus communication in automation technology.

SafetyNET p in automation

SafetyNET p enables automation data and safety-related data to be transmitted simultaneously, whereby horizontal and vertical integration of automation and functional safety are available in a single communication protocol.

SafetyNET p – Communication model

The SafetyNET p communication model describes the communication system and its two components, the application layer and the transport layer. The application layer transmits the existing device function from the application side into a generic functionality on the SafetyNET p side. As SafetyNET p uses two different transport mechanisms, i.e. RTFL and RTFN, there are two transport layer implementations.

In its two guises RTFN and RTFL, SafetyNET p is at home on all levels of the automation pyramid: while SafetyNET p RTFN is used for communication within an automation cell or vertically with Office and ERP networks, SafetyNET p RTFL is preferred on applications with the highest reaction time requirements. The application layer of RTFL and RTFN devices is identical: The only difference is in the transport layer, which in the case of RTFL is implemented using an FPGA chip.

SafetyNET p uses the familiar CANopen device profiles. This allows manufacturers to build on familiar interfaces and reduce the work involved in interface implementation to a minimum.

Application layer

The application layer represents the application’s interface to the communication system. All of a device’s SafetyNET p functions are made accessible via the application layer. The application layer represents the interface between the user and the communication system. SafetyNET p uses the popular CANopen application layer.

As the CANopen device profiles are not committed to a specific communications medium, they can be used for SafetyNET p. From the perspective of today’s CANopen users, this means that they can fall back on familiar interfaces.

Implementation of SafetyNET p

Simple, flexible and economical implementation options are the key to gaining acceptance of an industrial communication system among manufacturers of automation devices. These requirements have been considered on SafetyNET p: various options are available for the implementation of SafetyNET p devices. The manufacturer can therefore reduce the effort required for interface implementation to a minimum. The application layer of RTFL and RTFN devices is identical. RTFL and RTFN implementations differ only in the transport layer, where RTFL uses an FPGA chip.

More about Safety Network International e.V.

Benefits of membership

Take a look at the benefits the organisation offers its members

People at Safety Network International e.V.

An overview of all your contacts in the organisation


More about the safe, open fieldbus system