Codesys Ros2

The ROS2 Nav2 stack calculates a velocity command ( Twist message). It publishes this to a topic /cmd_vel . Through a DDS bridge or Gateway, this data arrives in the CODESYS controller as a structure containing linear and angular velocities. The CODESYS logic then checks if the velocity is within safe limits, applies ramping (smooth acceleration), and sends the command to the motor drives.

Use the CODESYS MQTT library to publish PLC variables to a broker and subscribe to them via a ros2_mqtt bridge for non-real-time tasks. codesys ros2

From those sleepless corrections came a framework stronger than a patched bridge. They codified authority: CODESYS would always own safety-critical states and determinism; ROS 2 would own perception, planning, and high-level coordination. They designed QoS rules, hardened the translator with schema checks, and introduced layered fallbacks: if ROS 2 stopped speaking, CODESYS would continue safe, predictable behavior. New diagnostic channels allowed operators to trace ROS 2 topic flows from the PLC screen—no longer a mysterious black box, but a transparent conversation. The ROS2 Nav2 stack calculates a velocity command

ROS 2 calculates a path that avoids a human worker who just walked into the frame. ROS 2 sends the new coordinates to The CODESYS logic then checks if the velocity

For high-performance applications (200Hz to 1000Hz), shared memory is the best option if both systems run on the same hardware (like a Raspberry Pi or an IPC). Architecture A ROS 2 node writes data to a shared memory segment.

: This open-source bridge (originally for ROS but adaptable for ROS 2) maps CODESYS variables directly to ROS topics using a dedicated library and a ROS node. Industrial Protocols : Alternatives include using Modbus TCP