p-net Profinet device stack

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p-net

Profinet device stack implementation. Key features:

  • Profinet v2.4

    • Conformance Class A and B

    • Real Time Class 1

  • Easy to use

    • Extensive documentation and instructions on how to get started.

    • Build and run sample application on Raspberry Pi in 30 minutes.

  • Portable

    • Written in C.

    • Linux, RTOS or bare metal.

    • Sources for supported port layers provided.

The RT-Labs Profinet stack p-net is used for Profinet device implementations. It is easy to use and provides a small footprint. It is especially well suited for embedded systems where resources are limited and efficiency is crucial. The stack is supplied with full sources including porting layers and a sample application.

Also C++ (any version) is supported for application development.

The main requirement on the platform is that it can send and receive raw Ethernet Layer 2 frames.

Features:

  • TCP/IP

  • RT (real-time)

  • Address resolution

  • Parameterization

  • Process IO data exchange

  • Alarm handling

  • Configurable number of modules and sub-modules

  • Bare-metal or OS

  • Porting layer provided

  • Supports I&M0 - I&M4. The I&M data is supported for the device, but not for individual modules.

Limitations or not yet implemented:

  • Only a single Ethernet port (no media redundancy)

  • No startup mode legacy

  • No support for RT_CLASS_UDP

  • No support for DHCP

  • No fast start-up

  • No MC multicast device-to-device

  • No iPar (parameter server) support

  • No support for time synchronization

  • No UDP frames at alarm (just the default alarm mechanism is implemented)

This software is dual-licensed, with GPL version 3 and a commercial license. See LICENSE.md for more details.

Requirements

The platform must be able to send and receive raw Ethernet Layer 2 frames, and the Ethernet driver must be able to handle full size frames. It should also avoid copying data, for performance reasons.

  • cmake 3.14 or later

For Linux:

  • gcc 4.6 or later

  • See the “Real-time properties of Linux” page in the documentation on how to improve Linux timing

For rt-kernel:

  • Workbench 2020.1 or later

An example of microcontroller we have been using is the Infineon XMC4800, which has an ARM Cortex-M4 running at 144 MHz, with 2 MB Flash and 352 kB RAM. It runs rt-kernel, and we have tested it with 9 Profinet slots each having 8 digital inputs and 8 digital outputs (one bit each). The values are sent and received each millisecond (PLC watchdog setting 3 ms).

Dependencies

The p-net stack contains no third party components. Its external dependencies are:

  • C-library

  • An operating system (if used)

Tools used for building and documentation (not shipped in the resulting binaries):

  • cmake (BSD 3-clause License)

  • Sphinx (BSD license)

Contributions

Contributions are welcome. If you want to contribute you will need to sign a Contributor License Agreement and send it to us either by e-mail or by physical mail. More information is available on https://rt-labs.com/contribution.