A robotic program of an industrial robot is simulated. Inputs on a robotic program of a robot are received. The robotic program of the robot is represented with a neutral representation modeled with a neutral language. Specific code portions of the robotic program in the neutral representation are mapped with corresponding specific code portions of a native representation modeled with a native language of the at least one robot. The robot program in simulated in one of the neutral representation and the native representation. Corresponding code portions of the neutral representation and of the native representation of the robotic program are synchronized via the mapping.

A robotic program of an industrial robot is simulated. Inputs on a robotic program of a robot are received. The robotic program of the robot is represented with a neutral representation modeled with a neutral language. Specific code portions of the robotic program in the neutral representation are mapped with corresponding specific code portions of a native representation modeled with a native language of the at least one robot. The robot program in simulated in one of the neutral representation and the native representation. Corresponding code portions of the neutral representation and of the native representation of the robotic program are synchronized via the mapping.

An offline programming device includes an input unit that receives input of a plurality of teaching points, a creation unit that determines intermediate point located between adjacent teaching points and creates an operation program for the robot, a simulation unit that simulates a movement trajectory of the robot when the operation program is executed, and a display unit that displays a GUI screen representing the movement trajectory. The GUI screen includes a first display area showing a time series sequence of the plurality of teaching points and a second display area. When an error is detected in the movement trajectory, a section between the teaching points including the point in time when the error occurs is displayed in the first display area according to a first error display method.