System for writing a simulation program

A system for writing a simulation program for simulating an automation installation, comprising:

• means for defining a respective resource object for a plurality of components of the automation installation, each defined respective resource object of said plural components being assigned a program fragment including computer program code for simulation of a functionality of an associated component of said plural components and each respective resource object having at least one port with a value which is at least one of assignable and read in by the program fragment of the associated resource object;
• means for defining port data for each of the at least one port, the defined port data defining properties of values being interchangeable at an associated port of the at least one port;
• means for identifying a first port of a first resource object which is provided for interchanging values with a second port of a second resource object based on the defined port data belonging to the first and the second port;
• means for defining precisely one variable which can be occupied by the values to be interchanged between the first and second port;
• and
• means for integrating program fragments assigned to the first and second resource object into the simulation program and for occupying variables with the values to be interchanged between the first and second port.