Codesys Ros2 【Linux】

The convergence of classical Programmable Logic Controller (PLC) ecosystems and modern robotic software frameworks is a critical challenge in Industry 4.0. CODESYS, a dominant IEC 61131-3 development environment, excels at hard real-time control and fieldbus management (EtherCAT, CANopen). The Robot Operating System 2 (ROS2), built on Data Distribution Service (DDS), provides a flexible, distributed middleware for perception, planning, and collaboration. This paper proposes a formal architecture for integrating CODESYS runtime with ROS2. We analyze communication patterns, data representation mapping, real-time constraints, and security implications. A reference implementation using ROS2-native client libraries for CODESYS is presented, alongside performance benchmarks comparing native DDS versus OPC UA gateway approaches.

Integrating a non-real-time (or soft real-time) ROS 2 system running on Linux with a hard real-time CODESYS runtime requires a reliable communication bridge. Three primary patterns dominate the industry: 1. DDS (Data Distribution Service) Native Communication

CODESYS provides a . Inside your CODESYS project, you instantiate a "ROS 2 Node" function block. codesys ros2

| CODESYS type | ROS2 message type | Example | |--------------|------------------|---------| | BOOL | std_msgs/Bool | – | | INT, DINT, LINT | std_msgs/Int32, Int64 | – | | REAL, LREAL | std_msgs/Float32, Float64 | – | | ARRAY[0..5] OF REAL | std_msgs/Float32MultiArray | layout dim [6] | | STRUCT | Custom .msg | field-by-field |

Combining these two through a allows manufacturers to build intelligent, connected robotic systems that are both reliable and flexible. What is CODESYS and Why ROS 2? This paper proposes a formal architecture for integrating

mkdir -p ros2_codesys_ws/src cd ros2_codesys_ws/src ros2 pkg create --build-type ament_python codesys_bridge --dependencies rclpy std_msgs Use code with caution. Step 3: Write the Python Bridge Code

Real-time joint trajectory streaming for 6-axis industrial arms or precise AMR wheel synchronization. Integrating a non-real-time (or soft real-time) ROS 2

We can look into structuring to guarantee high safety compliance between systems.

The integration of CODESYS and ROS2 is a pivotal step toward Industry 4.0. It bridges the gap between the reliable, deterministic world of factory automation and the flexible, intelligent world of modern robotics, offering a comprehensive solution for advanced automation challenges. Share public link

| Pattern | Direction | Real-time req. | Suggested QoS | |---------|-----------|----------------|----------------| | Sensor streaming | PLC → ROS2 | <5ms latency | BEST_EFFORT, VOLATILE | | Command/control | ROS2 → PLC | Deterministic (<1ms jitter) | RELIABLE, TRANSIENT_LOCAL | | Parameter sync | Bidirectional | >100ms | RELIABLE, PERSISTENT | | Emergency stop | ROS2 → PLC | Priority interrupt | RELIABLE, Deadline 1ms |

Using a TCP-based JSON interface to send data between the PLC and ROS 2.