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lightweight-cobot/doc/lwc-doc/docs/getting-started/concepts/fri-protocol.en.md
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Даниил Грабарь 79d88db930 Add documentation for KUKA Sunrise features and programs
- Created a new document for the Station interface, detailing its menu structure, process data, safety functions, frames, and smartPAD function buttons.
- Added a document for RobotPowerControl, explaining its purpose for safely shutting down or restarting the KUKA Sunrise Cabinet controller.
- Introduced ServerFriRos2 documentation, outlining its role in establishing an FRI connection between the KUKA LBR iiwa and a ROS 2 computer.
- Documented the TeachKuka application, which allows manual teaching of the KUKA LBR iiwa, including position capturing and trajectory recording.
- Added an overview of Sunrise Workbench, including installation instructions for Windows and Linux.
- Created a section on installing a Windows compatibility tool (PortProton) on Linux.
- Documented the installation process for SunriseWorkbench on Linux using PortProton.
- Added installation instructions for SunriseWorkbench on Windows.
- Created troubleshooting documentation for configuration errors and SSL errors during installation.
- Implemented a hook to generate the shared PDF only during the default-language build.
2026-08-13 18:01:59 +03:00

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# FRI protocol
!!! info "Work in progress"
A detailed description of the FRI protocol is being prepared.
**FRI (Fast Robot Interface)** is a UDP protocol for low-level real-time control of a KUKA robot. It runs over Ethernet and provides a deterministic data exchange cycle between an external PC and the KUKA controller.
## Main characteristics
- **Transport:** UDP (no delivery guarantee, which is important for real-time operation)
- **Cycle period:** 5 ms (200 Hz) or 10 ms (100 Hz), configured in `cobot-setting.yaml``robot.fri_cycle_ms`
- **Control modes:** position, torque, and impedance
## Network requirements
!!! warning "Important: a 5 ms cycle requires KONI"
A **5 ms (200 Hz)** cycle requires the **KONI** port (KUKA Optional Network Interface).
The KLI port supports only a 10 ms cycle. Set `fri_cycle_ms: 10` when using KLI.
| Port | Minimum cycle | Purpose |
|---|---|---|
| **KONI** | 5 ms | High-frequency control, recommended for FRI |
| **KLI** | 10 ms | Standard control and programming |