A control system for an industrial robot. The control system includes a memory unit configured to store at least one task program intended for controlling movements of the robot and including movement instructions for controlling the movements of the robot. A program executer is configured to generate instructions based on movement instructions included in the task program and data necessary to be able to carry out the instructions. A path planner is configured to receive the instructions from the program executer and based thereon to plan how the movements of the robot are to be designed to enable the robot to carry out the movement instructions. The control system includes a recording device, with at least one memory unit connected thereto, arranged for the purpose of recording and storing the instructions and the data sent to the path planner from the program executer.